An improved stall warning system has been developed for general aviation aircraft. Existing stall warning systems are susceptible to false warning signals caused by rough or gusting air. These extraneous warning signals have been eliminated by adding a signal discriminator to the basic stall warning system. The design requires a low-cost, highly repeatable, time-delay module, capable of “zero timing” at each independent actuation of the stall sensor switch. The development of this device is described, and the service test results are discussed.