What happened
During a private pilot checkride for a multi-engine land rating, the pilot was performing maneuvers toward the end of the examination. After completing single-engine maneuvers and a simulated instrument approach, the pilot believed only a short-field landing and an emergency descent remained. During the final approach for the short-field landing, the examiner simulated a failure of the right engine.
The pilot feathered the right propeller but suspected the examiner may have moved the control to a zero-thrust position. Realizing the aircraft would not reach the runway, the pilot attempted a go-around. Upon increasing power on both engines, the aircraft began a left turn as the pilot noticed the left propeller speed was decreasing. The examiner took control, reduced power on both engines, and performed a landing in a grass field. There were no fatalities.
The investigation
An examination of the aircraft revealed no mechanical malfunctions prior to impact. The left propeller was found in the feathered position. Both propeller controls were positioned mid-range, with the left control trailing the right control by approximately one inch.
Findings
Review of the FAA Commercial Pilot Practical Test Standards indicated that while applicants are required to actually feather a propeller, the procedure is specified to be performed at altitude; all other procedures are intended to be simulated. The standards also state that examiners must use good judgment when simulating emergency procedures, considering local weather, topography, and the applicant's workload.