FAA Commercial Pilot Airplane (CAX)Aerodynamics and PerformanceMedium
A pilot flying in smooth air intentionally increases airspeed beyond Vne during a shallow dive. What is the primary aerodynamic risk being taken?
- AStructural failure or flutter due to exceeding the airframe's design speed limit
- BSudden loss of lift due to increased induced drag
- CExceeding the critical angle of attack
- DEncountering an accelerated stall
Show answer & explanationAnswer & explanation
Correct answer: A. Structural failure or flutter due to exceeding the airframe's design speed limit
Vne (never-exceed speed) is a structural limit, not an aerodynamic stall limit. Exceeding it risks flutter, control surface divergence, or structural failure due to airloads beyond design limits, even in smooth air with no gust loading.
Why the other options are wrong
- B. Induced drag decreases at higher speeds; this is not the primary risk of exceeding Vne.
- C. High speed dives move away from, not toward, critical AOA.
- D. Accelerated stalls occur near critical AOA at high load factors, not from high-speed dives in smooth air.
Never-Exceed Speed (Vne)
The absolute structural speed limit that must never be exceeded, marked by the red radial line on the airspeed indicator.
- Exceeding Vne risks flutter and structural failure, unrelated to stall or AOA.
- Vne is a fixed structural limit regardless of load factor.
- Va (maneuvering speed) protects against structural damage from abrupt maneuvers, while Vne protects against high-speed structural failure.
Memory trick: Red line means structure, not stall — never cross it.