ASN Wikibase Occurrence # 286631
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| Date: | Thursday 27 August 2009 |
| Time: | 08:00 LT |
| Type: |  Piper PA-25-235 |
| Owner/operator: | |
| Registration: | N7339Z |
| MSN: | 25-3289 |
| Year of manufacture: | 1965 |
| Total airframe hrs: | 8430 hours |
| Engine model: | Lycoming O-540 B2C5 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Bainbridge, Georgia -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | Bainbridge-Decatur County Airport, GA (BGE/KBGE) |
| Bainbridge-Decatur County Airport, GA (BGE/KBGE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane was performing a training aerial application over a farm field when the engine lost power and the pilot performed a forced landing to a field, where the airplane impacted a tree. A subsequent examination of the engine revealed that within the accessory section, the idler gear assembly, which normally transferred power from the crankshaft to the left magneto and the camshaft, had been displaced. The short shaft had also been displaced. The mounting plate retaining screws appeared to be sheared. The crankcase surface area around the screw hole exhibited rotational scoring, and the idler gear, located in the oil sump, had no missing or damaged gear teeth. Metal particles were found in the bottom of the crankcase and oil sump. The engine operating time was below the recommended time between overhaul. The failure sequence could not be determined, and although the left magneto had been replaced approximately 12 flight hours prior, the replacement of the magneto could not be correlated to the displacement of the idler gear assembly.
Probable Cause: A total loss of engine power due to the loss of camshaft timing as a result of the displacement of the idler gear assembly.
Accident investigation:
 |
|
Sources:
NTSB ERA09LA490
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Oct-2022 13:39 | ASN Update Bot | Added |
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