Aircraft Performance & Weight and Balance
Density altitude, takeoff distance, and load limits aren't just numbers on a chart—they're the variables that determine whether a flight ends safely or doesn't. The Private Pilot knowledge test expects you to calculate weight and balance, read performance tables and graphs, and understand how temperature, pressure, humidity, and runway conditions shrink your aircraft's margins. Mastering these concepts protects you long after the exam is behind you. Work through our 14 in-depth, ACS-aligned aircraft performance & weight and balance articles below, or return to the Private Pilot library.
Pressure Altitude vs Indicated Altitude in Performance Calculations
Pressure altitude—not indicated altitude—is the baseline for nearly all aircraft performance charts, because it captures the air density your engine and wings actually experience on any given day.
How to Read a Takeoff Distance Chart in the POH
Takeoff distance charts in the Pilot's Operating Handbook show exactly how much runway you need under specific conditions — learning to read them correctly is essential for safe departures and FAA test success.
How to Read a Landing Distance Chart in the POH
A step-by-step guide to extracting accurate landing distance numbers from a Pilot's Operating Handbook (POH) performance chart, including how to apply correction factors and avoid the most common test-day mistakes.
Climb Performance and Best Rate vs Best Angle of Climb
Best rate of climb (Vy) gains the most altitude per unit of time, while best angle of climb (Vx) gains the most altitude per unit of horizontal distance — knowing when to use each is essential for safety and obstacle clearance.
Effect of Wind on Takeoff and Landing Performance
Wind direction and speed dramatically affect the runway length required for takeoff and landing — a headwind shortens the roll while a tailwind can add hundreds of feet of required distance, making wind one of the most critical performance variables a pilot must calculate before every flight.
Density Altitude and Its Effect on Aircraft Performance
Density altitude is pressure altitude corrected for non-standard temperature — when it rises, aircraft performance drops significantly, making it one of the most dangerous and misunderstood factors in general aviation flying.
Basic Weight and Balance Terminology: Empty Weight CG Datum and Moment
Understanding empty weight, center of gravity, datum, and moment is essential for every preflight weight and balance calculation — and for passing the FAA knowledge test.
Standard Atmosphere and ISA Deviation
The International Standard Atmosphere (ISA) defines a reference baseline of temperature, pressure, and density so pilots can compare performance data; understanding ISA deviation reveals how real-world conditions degrade or improve aircraft performance.
Computing Aircraft Weight and Balance Using the Moment Method
Learn how to calculate aircraft weight and balance using the moment method — adding individual moments to verify the loaded CG falls within the envelope before every flight.
Effect of Runway Surface on Aircraft Performance
Runway surface type and condition dramatically affect takeoff and landing distances; understanding pavement, grass, gravel, snow, and wet surfaces helps pilots make safe go/no-go decisions.
Reading and Interpreting a CG Envelope Graph
A CG envelope graph shows the combinations of weight and center-of-gravity location that keep an aircraft safely controllable; learning to read it accurately is essential for every preflight weight-and-balance check.
How Fuel Burn Affects CG During Flight
As fuel burns during flight, an aircraft's center of gravity shifts — sometimes dramatically — affecting stability and control. Understanding this movement is essential for safe flight planning.
Consequences of Operating Outside CG Limits on Aircraft Stability and Control
Operating an aircraft outside its center-of-gravity limits compromises stability and control in ways that can be impossible to recover from — understanding why protects every flight.
Weight and Balance for Shifting or Adding Passengers and Cargo
Learn how to calculate the effect of shifting or adding passengers and cargo on an aircraft's center of gravity, including the moment-change formula and key safety limits every private pilot must know.
More Private Pilot 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.