What happened
During a flight intended to allow the pilot in command (PIC) to obtain a multi-engine add-on rating, a Designated Pilot Examiner (DPE) simulated an engine failure by retarding the left throttle. Following this action, the aircraft's airspeed decreased, and the pilot reported that they were unable to maintain altitude or attitude.
Attempts to restore power by re-advancing the left throttle had no apparent effect. Unable to restore power to the left engine, the pilot relinquished flight controls to the DPE. The crew prepared for an approach to the airport. Because the left engine and hydraulic system were inoperative, the pilot utilized the manual hand pump to operate the landing gear and flaps after ensuring the aircraft would clear all obstacles.
Despite continued pumping of the manual system, the aircraft was forced to land short of the runway. During the touchdown, the nose gear collapsed before it was fully extended. The wing flaps were found to be in the extended position following the landing.
The investigation
The investigation examined the hydraulic system and engine performance. It was noted that the landing gear and wing flaps operated from the same hydraulic system, and either could have been actuated independently of the other. The aircraft's hydraulic system was designed such that if the gear and flaps were engaged simultaneously, the gear would complete its opening cycle before the flaps operated. Investigators found no reason for the loss of power in the left engine.