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Kit ID


Aural Mach Overspeed Warning System

Provides a fully automatic airspeed monitoring system, which, because of the low drag feature that allows the Commander jet props to easily increase airspeed during let down, has introduced the added safety feature of an aural warning in the event of an inadvertent overspeed of the airplane. The sensing switch is pre-set to aurally alert the pilot of airspeeds exceeding 243 KIAS. Models 690, 690A, 690B, 690C, 695.

Issue Date



690A, 690B, 690C, 695