ASN Wikibase Occurrence # 264402
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| Date: | Sunday 20 June 2021 |
| Time: | 12:10 LT |
| Type: |  Piper PA-25-235 Pawnee |
| Owner/operator: | Evergreen Soaring Inc |
| Registration: | N6917Z |
| MSN: | 25-2660 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 7278 hours |
| Engine model: | Lycoming O-540-B2C5 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Twisp Municipal Airport (2S0), WA -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Twisp, WA |
| Twisp, WA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot in the tailwheel-equipped airplane reported that, during the sixth flight of a glider tow operation, the control stick felt as though it had 'some play' with regard to the ailerons. The control stick moved about four inches laterally before a corresponding movement of the ailerons could be observed. He landed the airplane, performed a flight control check and noticed a 'little slack' between the control stick inputs and subsequent aileron movement. He determined that the control stick felt secure and took off on his seventh tow flight.
During the climb out, the response to his control stick inputs diminished. The airplane encountered turbulence and the control stick separated from the torque tube assembly. He maintained control of the airplane by using trim, rudder control and throttle variations. The airplane subsequently landed on the grass surface to the right of the runway. During a firm landing, the airplane veered right, and the right wing collided with a berm. The airplane sustained substantial damage to the leading-edge of the right wing.
A subsequent examination of the airplane's flight controls, revealed that the bolt which secured the control stick to the torque tube assembly had backed out. The castellated nut and cotter pin which secured the bolt were not located.
Probable Cause: An in-flight separation of the control stick from the torque tube assembly, which resulted in a loss of directional control during the landing roll and subsequent on-ground collision.
Accident investigation:
 |
|
Sources:
NTSB WPR21LA238
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Jun-2021 10:34 | Captain Adam | Added |
| 22-Jun-2021 11:18 | RobertMB | Updated [Time, Aircraft type, Source, Narrative] |
| 04-Jul-2022 12:30 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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