WARNING HORN IGNORED
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.