A flight instructor is briefing a client on an angle of attack (AOA) indicator installed in a training airplane. What primary advantage does an AOA indicator provide over relying solely on the airspeed indicator?
- AIt eliminates the need for a stall warning system since it directly senses wing stall onset mechanically
- BIt displays the airplane's proximity to the critical angle of attack directly, regardless of weight, bank angle, or load factor
- CIt provides more accurate airspeed readings than a pitot-static system during slow flight
- DIt replaces the need for calculating approach speeds based on aircraft weight for landing
Show answer & explanationAnswer & explanation
Correct answer: B. It displays the airplane's proximity to the critical angle of attack directly, regardless of weight, bank angle, or load factor
An AOA indicator senses the actual angle between the wing chord line and relative wind, directly showing how close the wing is to its critical (stalling) angle of attack. Unlike airspeed, which varies with weight, bank angle, and load factor for a given stall margin, AOA remains a constant reference to stall regardless of these variables, making it a more direct and reliable stall margin indicator.
Why the other options are wrong
- A. AOA indicators complement, not replace, stall warning systems, which use separate detection methods.
- C. AOA indicators do not measure or improve airspeed accuracy; they measure a different parameter.
- D. AOA indicators help manage approach margins but do not eliminate the value of computing reference speeds.
Angle of Attack (AOA) Indicator
An instrument that displays the wing's angle of attack relative to the critical (stalling) angle, providing a stall margin indication independent of airspeed, weight, or bank angle.
- Stall always occurs at the same critical AOA, regardless of airspeed, weight, or bank
- AOA indicators use vanes or pressure differential sensors on the wing/fuselage
- Provides more consistent stall margin awareness than airspeed alone during maneuvering
Memory trick: AOA doesn't care how heavy or how banked—it just watches the angle