ASN Wikibase Occurrence # 353992
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| Date: | Wednesday 5 August 1998 |
| Time: | 11:20 LT |
| Type: | M. C. Thomas STEWART S-51 |
| Owner/operator: | Private |
| Registration: | N151MT |
| MSN: | S-51D |
| Total airframe hrs: | 62 hours |
| Engine model: | GM 502 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Jackson, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Reno, NV (KRNO) |
| San Luis Obispo, CA (SBP | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While en route to the destination airport, the airplane experienced a loss of engine power. The pilot made a forced landing on a highway and collided with a snow pole. The airplane veered off of the road and came to rest after it collided with a tree. The owner/builder stated that he had modified the drive shaft from the original 'V' belt drive to a dual 'serpentine' belt/pulley system. He further stated that in order to install the new belt/pulley system, he had to weld a retaining pin in the center of the original drive shaft. The propeller governor pulley was found at the bottom of the engine compartment and the shaft was found to have separated at the center point. The drive shaft exhibited a bluing and discoloration at the center where the owner had welded it on the pin. It was noted that the original manufacturer of the propeller governor drive shaft had placed a heat treat stamp on the shaft.
Probable Cause: Failure of the propeller governor pulley drive shaft due to a modification made to the system by the owner that included welding a retaining pin to the center of the heat treated drive shaft, which compromised the shaft's design strength margin.
Accident investigation:
 |
|
Sources:
NTSB LAX98LA258
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Mar-2024 17:44 | ASN Update Bot | Added |
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