What happened
On July 27, 2016, a Piper PA18, registration HB-ORV, was conducting a flight training mission from Annecy Meythet toward Gap Tallable. During the flight, the instructor and student pilot noticed a bumblebee inside the cockpit. Despite attempts to dislodge the insect by opening the side window and the upper portion of the door, the insect remained in the cabin.
Recognizing the proximity of the private airfield at Monestier-de-Clermont, the instructor decided to divert for a precautionary landing. Upon approaching the grass runway 24, the instructor estimated a tailwind component of between 6 and 8 knots. The aircraft's approach speed was recorded at 65 mph, exceeding the recommended 60 mph. The aircraft touched down near the middle of the runway. Due to an incomplete flare, the aircraft bounced twice, resulting in a ground loop to the right. During this loss of control, the aircraft collided with an embankment bordering the runway, causing the main landing gear to break and resulting in heavy damage to the aircraft. No injuries were reported to the two occupants.
The investigation
The BEA examined the flight sequence, the environmental conditions, and the crew's decision-making process. The investigation confirmed that the instructor had performed a reconnaissance of the airfield and assessed the wind using the windsock. Meteorological data at the time indicated a north wind of 8 to 10 knots with potential gusts of 15 to 20 knots due to the local terrain. The investigation also reviewed the pilot's experience, noting the instructor was a qualified mountain pilot with significant flight hours, while the student held a PPL(A) license.
Findings
- The primary cause of the accident was the instructor's incorrect estimation of the tailwind component, which led to an unstabilized approach.
- The high ground speed during touchdown resulted in a long landing and subsequent bounces.
- The presence of the bumblebee in the cockpit likely contributed to hasty decision-making regarding the diversion.