Never Exceed Speed

Never exceed speed (V_NE) is the maximum speed at which an aircraft may be operated under any circumstances. It is depicted by a red radial line on the airspeed indicator. Exceeding V_NE risks structural failure due to aerodynamic flutter, dynamic overpressure, or loss of control. V_NE is a hard limit — there is no safe margin beyond it.

Flutter

At high speeds, aerodynamic and inertial forces can excite natural resonant frequencies in the aircraft structure (particularly control surfaces). If the resonant frequency matches the forcing frequency, oscillations grow rapidly — this is flutter. Flutter onset can destroy control surfaces within seconds. V_NE is set well below the demonstrated flutter speed.

V_NE vs. V_NO

• V_NE (Never Exceed): Absolute maximum — red line; never exceed under any circumstance
• V_NO (Normal Operating Limit): Upper end of the green arc; maximum for smooth air; in turbulence or gusty conditions, slow to V_NO or below

Inadvertent V_NE Exceedance

If V_NE is exceeded, the aircraft must be grounded and inspected before further flight. The POH and maintenance manual specify what inspection is required. Do not attempt to “test” the aircraft — even if it appears undamaged, flutter testing and structural inspection are required.

On the TC Written Exam

Know the ASI colour coding, including V_NE (red line) and V_NO (upper end of green arc). Know what happens structurally at excessive speed.

Related Terms

See also: Airspeed Indicator, V_A, V_NO.