AMT — Powerplant

Reciprocating and turbine engines, propellers, and powerplant systems.

224 topics · grounded in the FAA handbooks · 12-module study path · ~30 hr 12 min of reading

Study Path

A suggested reading order, sequenced like a textbook — start at Module 1 and work down. Each module builds on the last, mirroring how the FAA handbook presents the material.

Module 1: Reciprocating Engine Fundamentals
Introduces the basic construction, thermodynamic cycle, and performance principles of horizontally opposed reciprocating aircraft engines before moving into their supporting systems.
16 articles · ~2 hr 12 min
Module 2: Turbine Engine Fundamentals
Covers the gas path, compressor and turbine section design, and basic operating principles of turbojet, turbofan, turboprop, and turboshaft engines.
16 articles · ~2 hr 7 min
Module 3: Ignition, Starting & Electrical Systems
Builds from magneto theory through high/low tension ignition, timing, spark plugs, and turbine igniter and starter-generator systems used to start and fire both engine families.
32 articles · ~4 hr 15 min
Module 4: Engine Lubrication Systems
Explains oil properties, wet- and dry-sump system components, filtration and cooling, and turbine-specific lubrication needs that keep engines running reliably.
16 articles · ~2 hr 12 min
Module 5: Fuel Metering & Engine Fuel Systems
Progresses from carburetor and fuel-injection metering principles to complete aircraft fuel system architecture, pumps, controls, and turbine fuel control units.
32 articles · ~4 hr 18 min
Module 6: Induction & Exhaust Systems
Details how air and exhaust gases move through the engine, including icing protection, supercharging/turbocharging, and exhaust system design and inspection.
16 articles · ~2 hr 10 min
Module 7: Engine Cooling Systems
Examines air- and liquid-cooling methods, cowl and baffle design, and temperature monitoring used to keep both reciprocating and turbocharged engines within limits.
16 articles · ~2 hr 10 min
Module 8: Engine Instrument Systems
Surveys the temperature, pressure, speed, and thrust indicating systems mechanics use to monitor engine health during operation.
16 articles · ~2 hr 11 min
Module 9: Engine Fire Protection
Covers fire and overheat detection technologies and extinguishing systems, plus the firewall design and testing procedures that protect the airframe from engine fires.
16 articles · ~2 hr 9 min
Module 10: Engine Inspection & Overhaul
Walks through routine inspection techniques, overhaul criteria, and documentation requirements that determine an engine's continued airworthiness.
16 articles · ~2 hr 8 min
Module 11: Propeller Systems
Moves from propeller aerodynamics and blade design into constant-speed, feathering, and reversing systems, then into propeller inspection, balancing, and repair.
16 articles · ~2 hr 7 min
Module 12: Engine Removal & Installation
Concludes the study path with the practical procedures for disconnecting, hoisting, mounting, and returning an engine to service during a powerplant change.
16 articles · ~2 hr 13 min

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The same 224 articles, grouped by topic.

Reciprocating Engines(16)

Compression Ratio and Its Effect on Engine Performance

Compression ratio defines how much an engine compresses the air-fuel mixture before ignition, directly governing power output, efficiency, and fuel requirements in reciprocating aircraft engines.

Volumetric Efficiency in Reciprocating Aircraft Engines

Volumetric efficiency measures how completely a reciprocating engine fills its cylinders with a fresh charge, directly governing power output, fuel economy, and engine health for every piston-powered aircraft.

Valve Timing and Valve Overlap in Aircraft Engines

Valve timing and valve overlap govern when intake and exhaust valves open and close in a reciprocating engine, directly impacting power output, efficiency, and engine health at all operating speeds.

Horizontally Opposed Engine Configuration and Design

Horizontally opposed engines dominate light aircraft powerplants, offering a low-profile, balanced design with excellent power-to-weight ratios — a foundational topic for the FAA AMT Powerplant exam.

Magneto Ignition System Operation and Timing

Magneto ignition systems provide self-contained, high-voltage spark to aircraft reciprocating engines; precise timing of that spark relative to piston position is critical for safe, efficient engine operation.

Carburetor Icing and Alternate Air Systems

Carburetor ice can form even on warm days, silently robbing engine power; understanding how it forms and how alternate air systems prevent it is essential knowledge for any powerplant technician.

Detonation and Pre-Ignition Causes and Prevention

Detonation and pre-ignition are two distinct but dangerous abnormal combustion events in reciprocating aircraft engines that can destroy pistons and cylinders within seconds if not corrected.

Fuel-Air Mixture Ratio and Mixture Control Operations

Fuel-air mixture ratio determines combustion efficiency and engine health in reciprocating engines; proper mixture control prevents detonation, fouling, and power loss across varying altitudes and power settings.

Spark Plug Types, Heat Range Selection, and Inspection

Spark plugs must match the engine's heat range requirements for reliable ignition—choosing wrong causes fouling or pre-ignition, both of which can destroy an engine. This article covers types, heat range selection, inspection, and servicing for AMT Powerplant.

Engine Cooling Systems: Cylinder Baffling and Cowl Flaps

Cylinder baffling and cowl flaps direct airflow around engine cylinders to prevent overheating; understanding their design, inspection, and operation is essential for AMT Powerplant certification.

Engine Lubrication System Types and Oil Flow Paths

Aircraft engine lubrication systems — wet-sump, dry-sump, and pressure-spray designs — circulate oil to reduce friction, cool components, and carry contaminants away from critical engine parts.

Dry-Sump vs Wet-Sump Lubrication Systems in Aircraft Engines

Dry-sump and wet-sump lubrication systems both deliver pressurized oil to an aircraft reciprocating engine, but differ fundamentally in oil storage location, component count, and suitability for aerobatic or high-performance use.

Supercharging and Turbocharging in Reciprocating Aircraft Engines

Supercharging and turbocharging compress induction air to maintain or boost engine power at altitude, overcoming the density loss that otherwise reduces reciprocating engine performance as altitude increases.

TBO, Engine Run-Out Inspection, and Airworthiness Limits

Time Between Overhaul (TBO), engine run-out inspections, and airworthiness limits define when and how a reciprocating aircraft engine must be overhauled or retired to remain legally airworthy.

Engine Power Output: BHP, BMEP, and Manifold Pressure Relationships

Brake horsepower, brake mean effective pressure, and manifold pressure are tightly linked indicators of reciprocating engine power that every powerplant technician must understand for accurate diagnosis, performance testing, and airworthiness decisions.

Four-Stroke Otto Cycle in Aircraft Reciprocating Engines

The four-stroke Otto cycle—intake, compression, power, and exhaust—forms the thermodynamic foundation of every aircraft reciprocating engine, converting fuel energy into shaft work through precisely timed mechanical events.

Turbine Engines(16)

Turbine Engine Station Numbering and Gas Path Stations

Turbine engine station numbering is a standardized system that identifies discrete locations along the engine gas path, enabling precise performance monitoring, troubleshooting, and certification of turbine powerplants.

Axial-Flow Compressor Design and Stage Pressure Ratio

Axial-flow compressors build pressure incrementally through multiple rotor-stator stages, with each stage contributing a small pressure ratio that multiplies into the high overall ratios modern turbine engines demand.

Centrifugal-Flow Compressor Operating Principles

Centrifugal-flow compressors use rotating impellers to accelerate air outward and convert velocity to pressure, forming the heart of many small turbine engines and APUs.

Compressor Stall and Surge Causes and Remedies

Compressor stall and surge are dangerous disruptions to airflow in turbine engines that can cause power loss, structural damage, or flameout if not recognized and corrected quickly.

Annular Combustion Chamber Construction and Operation

The annular combustion chamber is the most common design in modern turbine engines, wrapping a single continuous combustion ring around the engine core to deliver efficient, even combustion with minimal length and weight.

Turbine Nozzle Guide Vane Function and Cooling Methods

Turbine nozzle guide vanes direct hot combustion gases onto turbine rotor blades at the correct angle and velocity while surviving extreme temperatures through sophisticated internal and external cooling techniques.

Turbofan Bypass Ratio and Thrust Contribution

Bypass ratio defines how much air a turbofan moves around its core versus through it, directly controlling fuel efficiency and thrust; higher bypass ratios dominate modern airliners while lower ratios suit high-speed military jets.

Turbine Blade Creep, Fatigue, and Hot-Section Inspection

Turbine blade creep, fatigue, and hot-section inspection are critical concepts for AMT powerplant exams, covering how extreme heat and stress degrade turbine components and how technicians detect and manage that damage.

Turboprop Reduction Gearbox and Propeller Coupling

Turboprop reduction gearboxes and propeller coupling systems slow turbine RPM to efficient propeller speeds while transmitting enormous torque — a critical system for any powerplant technician.

Turboshaft Engine Power Turbine and Output Shaft Design

Turboshaft engines use a free-spinning power turbine to extract shaft horsepower from hot gases, delivering mechanical power through an output shaft to helicopters, turboprops, and industrial drives rather than producing jet thrust.

Fuel Control Unit and Hydromechanical Metering Principles

The fuel control unit (FCU) precisely meters fuel flow to a turbine engine by translating pilot thrust demands and sensed engine parameters into exactly the right fuel quantity — preventing rich blowout, lean blowout, surge, and flameout across all flight conditions.

Engine Pressure Ratio (EPR) as a Thrust Indicator

Engine Pressure Ratio (EPR) measures turbine engine thrust by comparing turbine exhaust pressure to engine inlet pressure, giving pilots and mechanics a reliable, direct indication of actual thrust output.

Turbine Engine Oil System: Pressure, Scavenge, and Breather Subsystems

Turbine engine oil systems use three interconnected subsystems—pressure, scavenge, and breather—to lubricate, cool, and clean bearings and gears while continuously recirculating oil throughout the engine.

Foreign Object Damage (FOD) Recognition and Prevention in Turbine Engines

Foreign Object Damage (FOD) is a leading cause of turbine engine failures; understanding how debris enters engines, what damage it causes, and how to prevent it is critical knowledge for every AMT and pilot.

Full Authority Digital Engine Control (FADEC) System Operation

FADEC systems replace manual engine controls with a digital computer that automatically optimizes fuel delivery, turbine temperatures, and engine parameters throughout every phase of flight—maximizing efficiency and safety.

Turbine Engine Starts: Normal, Hot, Hung, and Wet Start Identification

Learn to identify and respond to normal, hot, hung, and wet turbine engine starts — covering EGT limits, RPM behavior, fuel flow, and what to do when a start goes wrong.

Engine Inspection & Overhaul(16)

Top Overhaul vs Major Overhaul Criteria

A top overhaul addresses cylinder assemblies only, while a major overhaul disassembles the entire engine to service limits — understanding the distinction is essential for AMT certification and safe engine maintenance.

FAA-Approved Engine Overhaul Data Sources

FAA-approved engine overhaul data sources define exactly which documents an AMT may legally use when overhauling a reciprocating or turbine aircraft engine, and understanding them is critical for both airworthiness and the mechanic certification exam.

Engine Logbook Entries and Airworthiness Records

Engine logbook entries and airworthiness records document every inspection, repair, alteration, and overhaul performed on an aircraft engine, forming the legal backbone of its continued airworthiness under 14 CFR Part 43 and Part 91.

Magnetic Chip Detector Inspection Procedures

Magnetic chip detectors capture ferrous metal particles in engine oil, serving as an early warning system for internal wear or failure; proper inspection procedures are critical for engine health monitoring and airworthiness.

Engine Inspection Intervals and TBO Requirements

Aircraft engine inspection intervals and TBO requirements govern when powerplants must be inspected or overhauled, balancing safety with regulatory compliance for AMT certification.

Borescope Inspection Techniques for Engine Cylinders

Borescope inspections allow AMTs to examine engine cylinder interiors without disassembly, revealing wear, corrosion, scoring, and combustion deposits that affect airworthiness.

Compression Testing: Differential Compression Test Procedure

The differential compression test is the standard FAA-approved method for evaluating cylinder health in reciprocating aircraft engines, revealing worn rings, valves, and cylinder walls through regulated air pressure and leakage measurement.

Propeller Flange and Crankshaft Runout Inspection

Propeller flange and crankshaft runout inspections verify that rotating components are true within tight tolerances, preventing vibration, structural fatigue, and catastrophic failure during engine operation.

Engine Mount Inspection and Crack Detection Methods

Engine mounts are the critical structural link between the powerplant and airframe; thorough inspection using visual, dye-penetrant, magnetic-particle, and eddy-current methods is essential for airworthiness.

Oil Analysis Programs and Spectrometric Oil Analysis

Spectrometric oil analysis (SOAP) detects microscopic metal particles in engine oil, enabling early identification of internal wear before catastrophic failure occurs.

Engine Cleaning Methods Before Inspection

Engine cleaning is a critical first step before any inspection or overhaul, ensuring contaminants are removed so technicians can accurately assess component condition and detect defects.

Visual Inspection of Engine Cylinders and Valve Train

A thorough visual inspection of reciprocating engine cylinders and valve train reveals wear, cracks, corrosion, and clearance issues before they cause in-flight failures—covering barrels, heads, valves, springs, and rocker assemblies.

Dimensional Inspection of Engine Parts: Fits and Limits

Dimensional inspection ensures engine components meet manufacturer-specified fits and limits during overhaul; understanding clearance, interference, and running fits is essential for safe engine reassembly and FAA knowledge tests.

Engine Run-Up and Power Check After Maintenance

A thorough post-maintenance engine run-up verifies that all systems are functioning correctly before returning an aircraft to service, covering oil pressure, magneto checks, and more.

Returned-to-Service Requirements After Engine Overhaul

After an engine overhaul, specific FAA-mandated paperwork, inspections, and operational tests must be completed before the powerplant can legally return to service and be approved for flight.

Serviceable, Repairable, and Rejected Part Classifications

FAA regulations and industry standards sort aircraft parts into three distinct classifications—serviceable, repairable, and rejected—that every AMT must understand before touching an engine or airframe component.

Engine Instrument Systems(16)

Engine Pressure Ratio (EPR) Indicator Operation and Calibration

The Engine Pressure Ratio (EPR) indicator measures turbine engine thrust output by comparing turbine discharge pressure to engine inlet pressure, serving as the primary power setting gauge for many jet aircraft.

Exhaust Gas Temperature (EGT) Gauge System Components and Limitations

The EGT gauge system measures combustion byproduct temperatures to optimize fuel mixture and monitor engine health, but its sensor placement and design impose important accuracy limitations every AMT must understand.

Turbine Inlet Temperature (TIT) Measurement and Monitoring

Turbine Inlet Temperature (TIT) is one of the most critical engine parameters on turbine-powered aircraft, indicating the gas temperature at the first-stage turbine and defining the thermal limits of the hottest engine components.

Tachometer Types: Mechanical, Electrical, and Electronic RPM Indicating Systems

Aircraft tachometers measure crankshaft RPM using mechanical, electrical, or electronic systems; understanding how each works and fails is essential for AMT powerplant certification and safe engine operation.

Manifold Absolute Pressure (MAP) Gauge Operation and Troubleshooting

The MAP gauge measures the absolute pressure of the air-fuel mixture entering a reciprocating engine's intake manifold, giving pilots and technicians a direct indication of engine power output and serving as a critical troubleshooting tool.

Fuel Flow Indicating Systems: Pressure-Type vs. Mass Flow Meters

Fuel flow indicating systems measure the rate of fuel delivery to aircraft engines, with pressure-type systems inferring flow from fuel pressure and mass flow meters directly measuring the true mass of fuel consumed per unit time.

Torquemeter Systems in Turboprop and Reciprocating Engines

Torquemeter systems measure the twisting force delivered to the propeller shaft in turboprop and reciprocating engines, giving mechanics and pilots a direct, reliable indication of engine power output for safe and efficient operation.

Oil Pressure Indicating Systems: Bourdon Tube and Transmitter Types

Oil pressure indicating systems use either a direct-reading Bourdon tube gauge or a remote-reading electrical transmitter to display engine oil pressure—a critical safety parameter for every flight.

Oil Temperature Gauge Systems and Sensor Placement

Oil temperature gauges protect aircraft engines by warning of overheating or insufficient warm-up; understanding their sensor types, placement logic, and failure modes is essential for AMT Powerplant certification.

Cylinder Head Temperature (CHT) Thermocouple Systems

Cylinder Head Temperature (CHT) thermocouple systems monitor combustion heat at the engine's most thermally stressed point, giving mechanics and pilots critical data to prevent detonation, pre-ignition, and engine damage.

Thermocouple Materials and Millivoltage Principles in Engine Temperature Instruments

Thermocouples generate a small but measurable voltage by joining two dissimilar metals, allowing precise exhaust gas and cylinder head temperature measurement without external power — a critical concept for AMT Powerplant certification.

Engine Vibration Monitoring Systems and Accelerometer Sensors

Engine vibration monitoring systems use accelerometer sensors to detect, measure, and display mechanical imbalance or structural anomalies in aircraft engines, enabling early fault detection and preventing catastrophic failure.

Synchroscope Operation for Multi-Engine RPM Synchronization

A synchroscope visually indicates speed differences between multi-engine propellers, allowing technicians and pilots to manually match RPM across all engines for smooth, vibration-free operation.

Gas Turbine N1 and N2 Tachometer Generator Systems

N1 and N2 tachometer generator systems measure compressor and turbine spool speeds in gas turbine engines, providing pilots and mechanics with critical RPM data essential for safe engine operation and performance monitoring.

Instrument Accuracy, Lag Error, and Snubber Devices in Engine Pressure Gauges

Engine pressure gauges must deliver accurate, steady readings; lag error, vibration, and surge damage are addressed through calibration standards and snubber devices that protect both the instrument and the pilot's situational awareness.

Engine Instrument Color Coding and Marking Requirements per FAA Standards

Engine instrument color coding and arc markings communicate critical operating limits at a glance, and FAA standards dictate exactly how each color must be applied to powerplant gauges.

Engine Fire Protection(16)

Fire Triangle and Combustion Principles in Aircraft Engines

Understanding the fire triangle—fuel, heat, and oxygen—and how combustion works in aircraft engines is essential for AMT powerplant technicians managing engine fire protection systems and procedures.

Types of Engine Fire Detection Systems (Thermal Switch, Thermocouple, Continuous Loop)

Engine fire detection systems—thermal switch, thermocouple, and continuous-loop types—each sense heat differently to protect aircraft and crew; understanding how each works is essential for the AMT Powerplant exam.

Kidde and Fenwal Continuous Loop Fire Detection System Operation

Continuous loop fire detection systems by Kidde and Fenwal use heat-sensitive elements routed throughout the engine nacelle to provide reliable, full-coverage fire and overheat alerts for aircraft powerplants.

Spot Detector Fire Detection System Components and Function

Spot detector fire detection systems use heat-sensitive sensing elements placed at specific engine locations to trigger cockpit fire warnings, forming a critical layer of engine fire protection for aircraft.

Pneumatic Fire Detection Tube Systems (Systron-Donner/Kidde)

Pneumatic fire detection tube systems use a gas-filled sensing element that responds to heat by triggering a cockpit alarm, providing continuous loop protection around critical engine zones.

Engine Fire Extinguishing Agent Types (Halon, HFC-227ea, CO2)

Aircraft engine fire suppression systems use Halon 1301, HFC-227ea, and CO2 as primary extinguishing agents, each with distinct properties, effectiveness, and environmental considerations that every AMT must understand.

Fire Detection System Circuit Testing and Fault Isolation

AMT Powerplant exam focus: how fire detection circuits are tested, what faults produce false alarms or missed fires, and the step-by-step isolation procedure used in maintenance.

High-Rate-of-Discharge (HRD) Fire Extinguisher Bottle Construction and Inspection

HRD fire extinguisher bottles are the backbone of aircraft engine fire suppression systems; understanding their construction, inspection criteria, and service life keeps aircraft airworthy and crews safe.

Fire Extinguisher Container Pressure Checks and Recharge Procedures

Fire extinguisher containers used in aircraft engine compartments require regular pressure checks and precise recharge procedures to ensure they will function reliably during an actual engine fire emergency.

Engine Fire Extinguishing System Plumbing and Discharge Nozzle Placement

Engine fire extinguishing systems rely on carefully routed plumbing and precisely positioned discharge nozzles to flood fire zones with agent quickly and completely, making correct installation and inspection critical for airworthiness.

Engine Nacelle Ventilation and Firewall Construction Requirements

Engine nacelles must meet strict FAA construction and ventilation standards to contain fires, prevent heat buildup, and protect adjacent structure — critical knowledge for AMT Powerplant certification.

Two-Shot Fire Extinguishing System Design and Squib Operation

Two-shot fire extinguishing systems protect aircraft engine nacelles using pressurized agent containers and explosive squib valves; understanding their design and sequencing is essential for AMT powerplant certification.

Firewall Materials, Fittings, and Penetration Sealing Standards

Aircraft firewalls form a certified barrier between the engine compartment and the cabin; understanding the approved materials, fittings, and sealing methods is essential for safe powerplant maintenance.

Overheat Detection vs. Fire Detection System Differences

Aircraft overheat detection and fire detection systems serve distinct protective functions — one warns of dangerously elevated temperatures before a fire starts, the other confirms active combustion, and understanding both is critical for AMT certification.

Engine Fire Handles and Cockpit Fire Control Panel Operation

Engine fire handles and cockpit fire control panels are the primary interface for crew-initiated fire suppression — understanding their operation is essential for AMT powerplant certification and real-world safety.

Maintenance and Functional Testing of Integrated Engine Fire Protection Systems

Integrated engine fire protection systems require disciplined inspection, component testing, and post-maintenance functional checks to ensure reliable detection and suppression — critical knowledge for AMT Powerplant certification.

Engine Electrical Systems(16)

Aircraft Engine Magneto Operating Principles

Aircraft magnetos generate high-voltage ignition sparks independently of the aircraft's main electrical system, ensuring reliable engine ignition through self-contained electromagnetic induction principles.

High-Tension vs Low-Tension Magneto Systems

High-tension magneto systems generate and distribute high-voltage spark directly to each cylinder, while low-tension systems generate low voltage and step it up at the cylinder; understanding both is essential for AMT Powerplant certification.

Magneto Inspection and Troubleshooting

Aircraft magneto systems require precise inspection and troubleshooting procedures to ensure reliable ignition; understanding timing, drop checks, and common failure modes is essential for any powerplant technician.

Ignition Harness and Shielding Requirements

The ignition harness delivers high-voltage pulses from magnetos to spark plugs while shielding prevents radio frequency interference; proper installation and testing are critical for engine reliability and avionics performance.

Spark Plug Types Selection and Servicing

Spark plugs ignite the fuel-air mixture in aircraft reciprocating engines; selecting the correct type and servicing them properly is critical for engine reliability, performance, and airworthiness.

Capacitor Discharge Ignition Systems for Turbine Engines

Capacitor discharge ignition systems store electrical energy in capacitors and release it as high-voltage, high-energy sparks to reliably ignite turbine engine fuel-air mixtures under demanding conditions.

Magneto Timing and Timing Procedures

Magneto timing synchronizes spark delivery to piston position for efficient combustion; correct internal and engine timing is critical for safe engine operation and FAA airworthiness.

Ignition Exciter Units and Glow Plugs in Turbine Engines

Turbine engine ignition exciters convert low-voltage aircraft power into high-energy sparks, while glow plugs provide sustained heat for combustion starts — both are critical for reliable engine ignition.

Engine-Driven Generator and Alternator Operation

Engine-driven generators and alternators convert mechanical energy into electrical power to supply aircraft systems and charge batteries; understanding their operation, regulation, and failure modes is essential for AMT powerplant certification.

Starter-Generator Systems on Turbine Engines

Starter-generator systems serve dual roles on turbine engines, cranking the engine to start and then switching to supply electrical power once the engine is self-sustaining — a compact, weight-saving solution common in turbine-powered aircraft.

Aircraft Engine Starter Types and Engagement Mechanisms

Aircraft engine starters convert stored energy into mechanical rotation to initiate engine starts; understanding starter types, engagement mechanisms, and failure modes is essential for AMT powerplant certification.

P-Lead Circuit Function and Grounding Safety

The P-lead (primary lead) connects the magneto breaker points to the ignition switch, allowing the pilot to ground—and safely disable—the magneto; a broken or disconnected P-lead leaves a magneto live even with the switch OFF.

Ignition Switch Wiring and Circuit Protection

Aircraft ignition switches control magneto grounding circuits rather than power circuits, meaning an open circuit—not a closed one—fires the engine; understanding this wiring logic and its circuit protection is critical for safe maintenance.

Impulse Coupling Operation and Inspection

Impulse couplings give magneto-driven ignition a powerful, retarded spark at engine start, then automatically advance timing for normal flight; understanding their operation and inspection is essential for AMT powerplant certification.

Engine Electrical Bus Connections and Grounding Techniques

Proper bus connections and grounding techniques are the foundation of reliable aircraft engine electrical systems — poor grounds cause more mysterious electrical faults than nearly any other single factor.

Magneto-to-Engine Timing Verification with Timing Light

Magneto-to-engine timing verification ensures ignition spark occurs at exactly the right crankshaft position; a timing light and timing marks are the primary tools for confirming correct setup on reciprocating aircraft engines.

Engine Lubrication Systems(16)

Viscosity and Viscosity Index in Aviation Lubricants

Viscosity measures an oil's resistance to flow and is the single most important property of any aviation lubricant; viscosity index describes how well that resistance holds up across a wide temperature range.

Wet-Sump Lubrication System Operation and Components

A wet-sump lubrication system stores oil directly in the engine crankcase and circulates it under pressure to all critical components; understanding its parts and operation is essential for AMT Powerplant certification.

Dry-Sump Lubrication System Operation and Components

Dry-sump lubrication systems keep oil in a separate external tank rather than the engine crankcase, enabling consistent oil supply under high-G flight conditions and improved engine cooling — essential knowledge for AMT Powerplant certification.

Functions and Properties of Aviation Engine Lubricating Oils

Aviation engine lubricating oils perform multiple critical functions beyond simple friction reduction, with specific chemical and physical properties that make them uniquely suited to the extreme demands of aircraft powerplants.

Oil Pressure Relief Valve Function and Adjustment

The oil pressure relief valve caps maximum system oil pressure to protect engine components; understanding its function and proper adjustment is essential for AMT powerplant certification.

Engine Oil Pump Types: Gear, Gerotor, and Vane Pumps

Aircraft engine oil pumps—gear, gerotor, and vane types—move oil under pressure through the lubrication system; understanding how each works, their advantages, and failure modes is essential for AMT Powerplant certification.

Straight Mineral Oil vs. Ashless Dispersant Oil for Piston Engines

Straight mineral oil and ashless dispersant oil serve different roles in piston engine lubrication — knowing when to use each is critical for proper engine break-in, maintenance, and airworthiness.

Full-Flow vs. Bypass Oil Filtration Systems

Full-flow and bypass oil filtration systems each protect aircraft engines in different ways — understanding both is essential for AMT Powerplant certification and safe engine maintenance.

Oil Cooler Design, Operation, and Thermostatic Bypass Valves

Aircraft oil coolers remove excess heat from engine oil using air or fuel as the cooling medium, while thermostatic bypass valves regulate oil temperature by controlling how much oil flows through the cooler versus a direct bypass path.

Oil Temperature and Pressure Monitoring: Acceptable Ranges and Troubleshooting

Oil temperature and pressure are the primary indicators of engine lubrication system health; understanding their acceptable ranges and what abnormal readings signal can prevent catastrophic engine failure.

Oil System Contamination: Metal Particles, Water, and Fuel Dilution

Oil system contamination from metal particles, water, and fuel dilution can silently degrade engine protection and signal serious mechanical problems — recognizing and responding to each type is essential for safe aircraft maintenance.

Turbine Engine Lubrication System Components and Oil Types

Turbine engine lubrication systems use pressure-fed, recirculating oil circuits with specific synthetic oils to cool and protect bearings, gears, and seals under extreme conditions.

Synthetic Turbine Lubricating Oils: Properties and Specifications

Synthetic turbine oils are engineered lubricants formulated to meet precise military and commercial specifications, providing exceptional thermal stability, load-carrying capacity, and oxidation resistance in gas turbine engines.

Oil Breather and Pressurization Systems in Turbine Engines

Turbine engine oil breather and pressurization systems vent crankcase pressure, prevent seal leaks, and protect bearing compartments from oil loss — critical knowledge for any AMT powerplant technician.

Oil Consumption Analysis and Causes of Excessive Consumption

Excessive oil consumption in aircraft engines can indicate serious internal wear or seal failure; AMT powerplant technicians must systematically diagnose its causes to maintain airworthiness.

Servicing, Draining, and Flushing Aircraft Engine Oil Systems

A complete guide for AMT Powerplant students on correctly servicing, draining, and flushing aircraft engine oil systems, covering procedures, safety rules, and FAA-tested specifics.

Ignition & Starting Systems(16)

Magneto Operating Principles and Construction

Aircraft magnetos generate high-voltage ignition sparks independently of the aircraft electrical system using rotating permanent magnets, coils, breaker points, and distributors — a self-contained, safety-critical system every AMT must master.

Shower of Sparks Ignition System

A shower-of-sparks ignition system fires multiple rapid sparks during engine start to reliably ignite the fuel-air mixture in aircraft piston engines, especially when the mixture is rich or the engine is cold.

Impulse Coupling Function and Inspection

Impulse couplings give reciprocating engine magnetos the high-voltage spark needed for starting by briefly retarding and then snapping the rotor, and they require careful periodic inspection to remain airworthy.

High-Tension vs. Low-Tension Ignition Systems

High-tension ignition systems deliver high-voltage current directly to spark plugs, while low-tension systems step up voltage near each plug — each design has distinct maintenance implications for aviation powerplants.

Magneto-to-Engine Timing and Timing Marks

Magneto-to-engine timing precisely aligns spark delivery to piston position for maximum combustion efficiency and safety; understanding timing marks is essential for any powerplant technician.

Magneto Timing: Internal and External Timing Procedures

Magneto timing ensures spark delivery at precisely the right crankshaft position for safe, efficient combustion; mastering both internal and external timing procedures is essential for any powerplant technician.

Ignition Harness: Inspection, Testing, and Replacement

The ignition harness carries high-voltage pulses from magnetos to spark plugs; proper inspection, testing, and timely replacement are critical for reliable engine ignition and airworthiness.

Capacitor Discharge Ignition (CDI) Systems for Turbine Engines

Capacitor Discharge Ignition (CDI) systems store electrical energy in capacitors and release it in high-voltage bursts to fire turbine engine igniters, providing the reliable, intense sparks needed to ignite jet fuel across a wide range of operating conditions.

Spark Plug Servicing, Gap Inspection, and Fouling Analysis

Proper spark plug servicing—covering gap inspection, cleaning, and fouling diagnosis—is critical for reliable engine ignition and is a foundational AMT powerplant skill tested on the FAA knowledge exam.

Ignition Switch and P-Lead Circuit Operation

The ignition switch and P-lead circuit control and ground magneto output; understanding how they interact is essential for safe engine operation and correct maintenance practice.

Spark Plug Types, Construction, and Heat Range Selection

Spark plugs ignite the fuel-air charge in aircraft engines and must match the engine's heat range, thread reach, and electrode design to ensure safe, efficient operation.

Turbine Engine Igniter Plugs and Exciter Units

Turbine engine igniter plugs and exciter units generate the high-energy electrical discharges needed to initiate and sustain combustion in jet and turboprop engines, differing fundamentally from piston-engine spark plugs in design, energy level, and duty cycle.

Direct-Cranking Electric Starter Operation and Troubleshooting

Direct-cranking electric starters convert electrical energy into mechanical torque to spin an aircraft engine to start, and understanding their operation and failure modes is essential for safe, airworthy maintenance.

Starting System Components: Starters, Solenoids, and Relays

Aircraft starting systems rely on starters, solenoids, and relays working together to crank the engine; understanding each component's role is essential for safe maintenance and troubleshooting.

Magneto Safety and Grounding Circuit Testing

A magneto's grounding circuit is the primary safety mechanism that stops the engine; understanding how to test it correctly prevents both accidental starts and undetected failures that leave a magneto live when it should be dead.

Hot, Hung, and False Start Identification in Turbine Engines

Hot starts, hung starts, and false starts are distinct turbine engine start anomalies that every AMT must recognize instantly — misidentifying them can destroy an engine or risk lives on the ramp.

Fuel Metering Systems(16)

Pressure-Injection Carburetor Design and Operation

Pressure-injection carburetors meter fuel by balancing multiple air pressures against a diaphragm-and-valve system, enabling reliable mixture control at all attitudes and altitudes without the float-system limitations common in simpler designs.

Carburetor Icing Types and Prevention Methods

Carburetor icing can occur well above freezing in humid conditions, threatening engine power and safety; understanding its three types and prevention methods is essential for every powerplant technician.

Float-Type Carburetor Operating Principles

Float-type carburetors use a venturi, float chamber, and metering jet to mix fuel and air in the correct ratio for combustion; understanding their operating principles is essential for AMT powerplant certification.

Carburetor Heat System Operation and Carb Heat Valve

The carburetor heat system prevents and eliminates ice formation in the carburetor venturi and throttle by routing warm air around the intake, and every AMT must understand how the carb heat valve controls this alternate air path.

Accelerator Pump and Power Enrichment Circuits

The accelerator pump and power enrichment circuits prevent lean stumbles during rapid throttle advances and ensure rich mixture delivery at high power settings — two critical carburetor systems every powerplant technician must understand.

Continuous-Flow Fuel Injection System Operation

Continuous-flow fuel injection delivers a steady, metered stream of fuel to each cylinder's intake port, eliminating carburetor icing and improving mixture distribution — a critical system for AMT Powerplant certification.

Mixture Control Systems in Carburetors

Mixture control systems in aircraft carburetors regulate the fuel-to-air ratio across varying altitudes and operating conditions, preventing rich-mixture inefficiency and lean-mixture engine damage.

Fuel Injection System vs Carburetor System Comparison

Fuel injection systems deliver fuel directly to each cylinder intake port while carburetors meter fuel through a venturi, each offering distinct advantages, limitations, and maintenance considerations for powerplant technicians.

Bendix RSA Fuel Injection Servo Operation

The Bendix RSA continuous-flow fuel injection servo precisely meters fuel by balancing impact air pressure against throttle-controlled venturi suction, delivering consistent mixture ratios across all power settings—a critical concept for AMT Powerplant certification.

Fuel Discharge Nozzle Function and Maintenance

Fuel discharge nozzles atomize and distribute fuel into the induction system or combustion chamber; understanding their design, flow characteristics, and maintenance keeps engines running efficiently and safely.

Throttle Body and Fuel Control Unit Operation

The throttle body and fuel control unit (FCU) work together to meter the precise air-fuel mixture delivered to aircraft engines, and understanding their operation is essential for AMT Powerplant certification.

Idle Mixture and Idle Speed Adjustment Procedures

Proper idle mixture and idle speed adjustment on reciprocating engines ensures smooth low-power operation, correct fuel-air ratios at idle, and clean acceleration without stumbling or roughness.

Fuel Injection System Troubleshooting and Leak Checks

Fuel injection systems deliver precise fuel-air mixtures directly to each cylinder, but leaks and metering faults can ground an aircraft fast — learn how to diagnose and correct them using FAA-approved procedures.

Vapor Lock Causes and Prevention in Fuel Metering Systems

Vapor lock occurs when fuel vaporizes inside the fuel system before reaching the engine, disrupting metering and causing power loss or engine stoppage — understanding its causes and prevention is essential for safe aircraft maintenance.

Fuel-Air Mixture Ratio and Engine Performance Effects

The fuel-air mixture ratio directly governs combustion efficiency, power output, and engine temperature in aircraft piston engines — understanding it is essential for safe operation and the AMT Powerplant exam.

Altitude Compensation and Automatic Mixture Control

Altitude compensation and automatic mixture control systems automatically adjust the fuel-air mixture as air density changes with altitude, preventing over-richening and maintaining efficient engine operation without constant pilot intervention.

Engine Fuel Systems(16)

Aircraft Fuel System Airworthiness Requirements (14 CFR Part 33 and Part 43)

Aircraft fuel system airworthiness requirements under 14 CFR Parts 33 and 43 govern design, performance, and maintenance standards that keep engine fuel systems safe and reliable throughout their service life.

Carburetor Float Bowl Operation and Fuel Metering

The float bowl is the carburetor's fuel reservoir, maintaining a precise fuel level through a float-and-needle-valve system that governs mixture richness at every power setting.

Carburetor Icing: Types, Causes, and Pilot-Mechanic Awareness

Carburetor icing can silently rob engine power—even on warm, clear days. Learn the three types, the conditions that cause them, and the maintenance and operational awareness every pilot and mechanic needs.

Fuel Injection System Operation: Continuous-Flow vs. Direct Injection

Fuel injection systems deliver fuel more precisely than carburetors, and understanding the difference between continuous-flow and direct injection is essential for AMT Powerplant certification and safe engine operation.

Throttle Body and Fuel Nozzle Inspection and Cleaning Procedures

Throttle bodies and fuel nozzles are precision components that meter air and fuel into aircraft engines; understanding their inspection and cleaning procedures is essential for AMT powerplant certification and safe engine operation.

Engine-Driven Fuel Pump: Design, Operation, and Failure Modes

Engine-driven fuel pumps are the primary fuel delivery devices on most piston and turbine aircraft engines, converting mechanical shaft power into pressurized fuel flow; understanding their design, normal operation, and failure signatures is essential for safe maintenance and FAA knowledge test success.

Auxiliary and Boost Pump Systems: Function and Redundancy

Auxiliary and boost pump systems provide fuel pressure redundancy for piston and turbine engines, ensuring reliable delivery during engine start, high-altitude operations, and primary pump failure.

Fuel Pressure Regulation and Relief Valve Operation

Fuel pressure regulation and relief valve operation keep engine fuel systems within safe pressure limits, preventing both fuel starvation and component damage across all power settings.

Fuel Vapor Lock: Causes, Prevention, and System Design Solutions

Fuel vapor lock occurs when vaporized fuel blocks fuel flow to the engine, causing power loss or stoppage; understanding its causes and prevention is critical for AMT powerplant certification.

Fuel Divider and Flow Divider Valve Operation in Fuel Injection Systems

The fuel divider (flow divider) valve is the heart of a fuel injection system, splitting metered fuel precisely and equally to each cylinder's injector nozzle for smooth, efficient combustion.

Mixture Control Systems: Manual vs. Automatic Mixture Control

Mixture control systems regulate the fuel-to-air ratio in reciprocating aircraft engines; understanding manual versus automatic designs is essential for safe engine operation and FAA Powerplant written exam success.

Fuel Manifold and Distribution System Inspection

The fuel manifold and distribution system routes metered fuel from the fuel control unit to each engine cylinder; inspecting it properly is critical for engine reliability, safety, and airworthiness.

Troubleshooting Fuel System Malfunctions: Rich and Lean Conditions

Learn how to diagnose rich and lean fuel mixture malfunctions in aircraft piston engines, from symptoms and causes to corrective actions grounded in FAA powerplant standards.

Turbine Engine Fuel Control Unit (FCU) Operation and Adjustment

The Fuel Control Unit (FCU) is the precision metering brain of a turbine engine, governing fuel flow from idle to full power while protecting against overtemperature, overspeed, and rich extinction across all flight conditions.

Fuel System Component Overhaul Limits and Airworthiness Directives

Fuel system components in aircraft engines are subject to strict overhaul limits and mandatory Airworthiness Directives that AMTs must understand to keep aircraft legally airworthy and operationally safe.

High-Performance and Turbocharged Engine Fuel System Considerations

Turbocharged and high-performance piston engines demand precise fuel system management—understanding vapor lock, fuel injection nuances, and turbo-specific enrichment is critical for safe AMT work.

Induction & Exhaust Systems(16)

Reciprocating Engine Induction System Types and Configurations

Reciprocating engine induction systems deliver the air-fuel mixture to cylinders; understanding naturally aspirated, supercharged, and turbocharged configurations is essential for AMT powerplant certification and safe engine operation.

Carburetor Heat System Operation and Carb Ice Prevention

Carburetor icing can silently steal engine power and cause failure even in warm weather; understanding how the carb heat system works and when to use it is essential for both pilots and powerplant technicians.

Throttle Body Fuel Injection Induction System Design

Throttle body fuel injection (TBI) combines the simplicity of a carburetor with the precision of fuel injection by delivering metered fuel into a single throttle body upstream of the intake manifold, improving fuel distribution and reducing icing risk compared to float carburetors.

Continuous-Flow Fuel Injection Induction System Operation

Continuous-flow fuel injection delivers a steady, metered fuel-air mixture directly to each cylinder's intake port, eliminating many carburetor vices and improving power output and fuel efficiency in piston aircraft engines.

Supercharger Types Gear-Driven vs Turbocharger

Superchargers boost engine induction pressure above ambient for increased power at altitude; gear-driven types are mechanically driven by the crankshaft while turbochargers use exhaust energy, each with distinct operating characteristics and maintenance implications.

Turbocharger Components Compressor Turbine and Wastegate

Turbochargers boost engine power at altitude by compressing induction air using exhaust-driven turbines; understanding the compressor, turbine, and wastegate is essential for AMT powerplant certification.

Intercooler and Aftercooler Function in Turbocharged Engines

Intercoolers and aftercoolers reduce the temperature of compressed induction air in turbocharged aircraft engines, improving density, power output, and engine longevity by cooling charge air before it enters the cylinders.

Induction System Icing Types Impact Ice Fuel Ice and Throttle Ice

Induction system icing—impact ice, fuel evaporation ice, and throttle ice—can silently starve an engine of air; understanding each type's cause and cure is essential for safe powerplant operation and the AMT Powerplant exam.

Induction System Airfilter Types Maintenance and Inspection

Aircraft induction system air filters trap contaminants before they reach the engine; understanding filter types, inspection intervals, and maintenance procedures is essential for AMT certification and safe engine operation.

Turbocharger Bootstrapping and Overboost Prevention

Turbocharger bootstrapping is an unstable self-reinforcing boost cycle that can rapidly drive manifold pressure beyond limits; understanding its causes and prevention is essential for safe turbocharged engine operation.

Alternate Air and Induction Air Source Valves

Alternate air and induction air source valves protect piston and turbine engines from induction icing and blockage by routing intake air through an alternate, heated path when the primary induction system becomes obstructed.

Exhaust Manifold Design Materials and Inspection Procedures

Exhaust manifold systems collect hot combustion gases from engine cylinders, and proper material selection plus rigorous inspection are critical for preventing carbon monoxide intrusion, structural failure, and fire hazards.

Turbocharger Exhaust Bypass Valve and Wastegate Control

The turbocharger wastegate and exhaust bypass valve regulate turbine speed and compressor output by controlling how much exhaust gas drives the turbocharger, protecting engines from over-boost while optimizing performance at altitude.

Exhaust Heat Exchanger and Cabin Heat Muff Operation

The exhaust heat exchanger (cabin heat muff) wraps around the exhaust stack to transfer heat to cabin air, but a cracked muff can be deadly — learn how it works, inspection priorities, and key regulations.

Exhaust System Crack Detection and Leak Hazards

Exhaust system cracks are a silent but deadly hazard in piston aircraft — learn how to detect them, why they matter, and what the regulations require for inspection and maintenance.

Augmentor Tube Exhaust Ejector System Function and Design

Augmentor tube exhaust ejector systems use high-velocity engine exhaust to induce cooling airflow through an aircraft's engine compartment, improving thermal management without added mechanical complexity.

Engine Cooling Systems(16)

Air-Cooled Engine Cylinder Cooling Fin Design and Function

Air-cooled aircraft engine cylinders rely on precisely engineered cooling fins to dissipate combustion heat into the surrounding airstream, making fin integrity and airflow management critical to engine longevity and safety.

Cooling Airflow Management: Baffles and Seals in Reciprocating Engines

Baffles and seals direct cooling air precisely around cylinder fins in air-cooled reciprocating engines, preventing hot spots and maintaining safe cylinder head temperatures for reliable operation.

Cylinder Head Temperature (CHT) Monitoring and Limits

Cylinder Head Temperature (CHT) is a critical engine health parameter that directly reflects combustion and cooling efficiency; exceeding CHT limits accelerates component wear and can cause catastrophic engine failure.

Oil Cooling Systems in Air-Cooled Aircraft Engines

Air-cooled aircraft engines rely on oil not just for lubrication but as a primary heat-transfer medium; understanding how oil coolers, thermostats, and airflow work together is essential for AMT Powerplant certification.

Augmentor Tube Exhaust Cooling Systems

Augmentor tube exhaust cooling systems use the venturi effect of hot exhaust gases to draw cooling air through aircraft engine compartments, eliminating the need for cowl flaps on many reciprocating-engine designs.

Cowl Flap Operation and Cooling Airflow Control

Cowl flaps are adjustable openings in the engine nacelle that regulate cooling airflow around the cylinders; proper operation prevents both overheating during climb and excessive cooling during descent.

Liquid-Cooled Aircraft Engine Cooling System Components

Liquid-cooled aircraft engines rely on a closed-loop system of coolant, pumps, radiators, thermostats, and overflow tanks to maintain precise cylinder temperatures — understanding each component is essential for AMT powerplant certification.

Coolant Types and Mixing Ratios for Liquid-Cooled Engines

Liquid-cooled aircraft engines rely on precisely formulated coolants to prevent freezing, overheating, and corrosion; understanding coolant types, mixing ratios, and maintenance requirements is essential for AMT certification and safe engine operation.

Cooling System Inspection and Troubleshooting Procedures

Liquid- and air-cooled aircraft engine cooling systems must be inspected and troubleshot systematically; understanding how heat is removed, what can go wrong, and the exact inspection steps is essential for AMT certification and safe engine operation.

Cowling Design and Its Role in Engine Cooling Efficiency

Cowling design directly controls airflow around and through aircraft engines, determining how effectively heat is removed during all phases of flight — a critical factor in engine longevity and safety.

Turbocharger Heat Management and Intercooler Function

Turbochargers dramatically raise intake air temperature, reducing power and risking detonation; intercoolers and careful heat management are essential to safe, efficient turbocharged engine operation.

Pressure Relief and Overflow in Liquid Cooling Systems

Liquid-cooled aircraft engines rely on pressure relief valves and overflow (surge) tanks to manage coolant pressure, prevent boiling, and protect system integrity — critical knowledge for AMT Powerplant certification.

Thermal Shock Prevention During Engine Cooldown Procedures

Thermal shock occurs when rapid temperature changes create destructive stress in engine components; proper cooldown procedures protect cylinder heads, valves, and other critical parts from cracking and warping.

Relationship Between Mixture Richness and Cylinder Cooling

Fuel mixture ratio directly controls cylinder head temperatures in aircraft piston engines; running too lean causes dangerous overheating while an excessively rich mixture wastes fuel but provides cooling — understanding this relationship is essential for safe engine management.

Cooling System Failure Indications and Pilot-Mechanic Response

Cooling system failures can lead to catastrophic engine damage within minutes; recognizing early cockpit indications and applying correct mechanic response procedures prevents permanent engine harm and unsafe flight.

Effects of Detonation and Pre-Ignition on Engine Cooling

Detonation and pre-ignition are abnormal combustion events that can rapidly overheat reciprocating aircraft engines, causing severe cylinder damage or catastrophic engine failure if not corrected immediately.

Propellers(16)

Fixed-Pitch Propeller Construction and Materials

Fixed-pitch propellers are permanently set at one blade angle and rely on carefully chosen materials and construction methods to deliver efficient thrust across a narrow speed range.

Propeller Blade Angle and Pitch Terminology

Propeller blade angle and pitch terminology defines how efficiently a propeller converts engine power into thrust; mastering these terms is essential for both FAA knowledge tests and real-world powerplant maintenance.

Constant-Speed Propeller Governor Operation

A constant-speed propeller governor automatically adjusts blade pitch to maintain a pilot-selected RPM, allowing the engine to operate at peak efficiency across varying flight conditions.

Propeller Feathering Systems and Procedures

Propeller feathering rotates blades to a near-90° pitch angle to stop windmilling after engine failure, dramatically reducing drag and improving multi-engine aircraft performance and safety.

Propeller Blade Aerodynamic Forces and Thrust Production

Propeller blades generate thrust through aerodynamic lift, with blade angle, rotational speed, and airflow angle of attack working together to convert engine torque into forward force.

Controllable-Pitch Propeller Operating Principles

Controllable-pitch propellers allow pilots or governors to change blade angle in flight, optimizing engine efficiency across all phases of operation from takeoff to cruise.

Propeller Reverse-Pitch Operation and Beta Mode

Reverse-pitch and beta-mode propeller systems allow turboprop aircraft to generate rearward thrust for ground braking and precise taxi control, using blade angle manipulation below the flight idle stop.

Propeller Inspection Techniques and Damage Assessment

Thorough propeller inspection catches nicks, cracks, corrosion, and blade imbalance before they become catastrophic failures — a critical AMT skill grounded in FAA maintenance standards.

Propeller Balancing Static and Dynamic Methods

Proper propeller balancing eliminates vibration, protects the engine and airframe, and is essential for airworthiness — mastered through both static and dynamic techniques.

Propeller Track Inspection and Adjustment

Propeller track inspection verifies that all blades sweep the same plane of rotation; even small deviations signal hidden damage or installation errors that can cause destructive vibration.

Propeller Blade Repair Limits and Reconditioning

FAA repair limits and reconditioning procedures govern what damage an AMT may correct on a propeller blade versus when replacement or overhaul is mandatory, directly affecting airworthiness and flight safety.

Propeller Synchrophasing and Synchronizing Systems

Propeller synchrophasing and synchronizing systems reduce vibration and cabin noise on multi-engine aircraft by precisely matching propeller RPM and blade phase angles, improving crew comfort and airframe longevity.

Propeller Hub Overhaul and Component Inspection

A thorough walkthrough of propeller hub overhaul procedures and component inspection standards, grounded in FAA maintenance practices and airworthiness requirements for powerplant technicians.

Propeller Blade Station and Angle Measurement Procedures

Propeller blade stations define specific measurement points along the blade, and blade angle is checked at those stations using a propeller protractor — a critical inspection procedure for AMT certification and airworthy prop setup.

Propeller De-Icing and Anti-Icing Systems

Propeller de-icing and anti-icing systems prevent dangerous ice accumulation on spinning blades by using electrical heating elements or fluid distribution boots, ensuring safe thrust production in icing conditions.

Propeller Installation Torque Values and Safety Wiring

Correct torque values and proper safety wiring are critical steps in propeller installation that prevent loosening, ensure structural integrity, and are directly tested on the FAA AMT Powerplant knowledge exam.

Engine Removal & Installation(16)

Engine Mount Inspection and Replacement Procedures

Engine mounts are the structural link between powerplant and airframe; inspecting them for cracks, corrosion, and fatigue — and replacing them correctly — is essential for airworthiness and vibration control.

Engine Lifting Sling Selection and Attachment Points

Selecting the correct lifting sling and properly identifying certified attachment points are critical first steps in safe engine removal and installation, preventing catastrophic drops and structural damage.

Firewall-Forward Component Inventory and Documentation

A thorough pre- and post-installation accounting of every component mounted forward of the firewall—ensuring nothing is missing, incorrectly installed, or undocumented before an engine is returned to service.

Hoisting and Positioning Techniques for Reciprocating Engines

Proper hoisting and positioning of reciprocating engines is essential for safe removal and installation, protecting personnel, airframes, and powerplants from damage or injury.

Torque Sequence and Values for Engine Mounting Hardware

Proper torque sequence and torque values for engine mounting hardware are critical to safe, airworthy installations — incorrect application can cause fastener failure, structural damage, or engine separation in flight.

Engine Preservation and Depreservation Procedures

Engine preservation protects idle piston and turbine powerplants from corrosion and mechanical damage during storage, while depreservation safely restores them to airworthy service — both require strict adherence to manufacturer and FAA-approved procedures.

Explanations are original summaries grounded in the public-domain FAA handbooks and cite their source. They are study aids, not a substitute for the official handbooks or regulations.