Incident Summary
During a training flight, the airplane executed a wheels-up landing after the instructor pilot did not lower the landing gear. The instructor had directed the student to perform a no-flap approach due to a simulated hydraulic pump failure. The student established the approach and requested the Emergency Gear Extension Checklist.
Circumstances
The instructor delayed extending the gear in accordance with the operator's flight standards manual, which specified that landing gear should not be lowered until a landing is assured. Later in the approach, the gear warning horn stopped sounding when the student moved the power levers forward. At that moment, the instructor removed his hand from the gear handle without extending the gear.
The instructor stated that because the student had already called for the Emergency Gear Extension Checklist once before, in a split-second thought process, he mistakenly thought the checklist had been completed.
Investigation Findings
Following the accident, the landing gear system was tested and found to operate normally. A review of maintenance records revealed no uncorrected discrepancies.
At the time of the accident, the instructor pilot was completing a 9-hour work day and had not taken a lunch break.