Propellers
Propellers is a core knowledge area on the AMT — Powerplant FAA written exam. This hub collects our 16 in-depth, ACS-aligned propellers articles — each written in plain English and grounded in the official FAA handbooks. Work through them below, then drill the topic with practice questions.
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.
More AMT — Powerplant subjects
Articles are original summaries grounded in the public-domain FAA handbooks and cite their source. ACS-aligned study aids — not a substitute for the official handbooks or regulations.