WARN­ING HORN IG­NORED

Pilot - - SAFETY MATTERS -

The Di­a­mond Twin­star was re­turn­ing to Coven­try Air­port af­ter the first sor­tie of a Multi-en­gine Pis­ton Flight In­struc­tor’s course. The pi­lot un­der train­ing was be­ing in­tro­duced to asym­met­ric han­dling, with one en­gine be­ing op­er­ated at 10% load to give zero thrust, and the un­der­car­riage warn­ing horn was sound­ing con­tin­u­ously. The trainee then joined the cir­cuit for a flap­less land­ing with the en­gine still set at zero thrust. Al­though, the 15,100-hour, Atpl-rated com­man­der be­lieved that he had con­firmed that the un­der­car­riage was down, the air­craft landed wheels-up. He noted that the un­der­car­riage warn­ing horn had been op­er­at­ing for ten min­utes prior to the land­ing, but hav­ing grown ac­cus­tomed to the sound, this might have led to his fail­ure to recog­nise that the un­der­car­riage was not in fact low­ered.

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