ASN Wikibase Occurrence # 364437
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| Date: | Wednesday 2 October 1991 |
| Time: | 13:20 LT |
| Type: |  Piper PA-31-350 |
| Owner/operator: | Frontier Flying Service Inc. |
| Registration: | N200AK |
| MSN: | 31-8052180 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 1763 hours |
| Engine model: | LYCOMING TIO-540J2BD |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Fairbanks, AK -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Fairbanks, AK (FAI) |
| Coldfoot, AK (CXF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING CRUISE FLIGHT, THE LEFT ENGINE LOST POWER AND OIL PRESSURE. AN ENGINE TEARDOWN ANALYSIS SHOWED THAT THE CRANKSHAFT COUNTERWEIGHTS HAD TWO INCORRECT OF THE FOUR INSTALLED ROLLERS. ALL FOUR ROLLERS WERE PART NO. 73648. ACCORDING TO TEXTRON LYCOMING, THE CORRECT ROLLER CONFIGURATION SHOULD HAVE BEEN 'TWO PART NO. 73648 5.1 ORDER AND TWO PART NO. 76788 6.3 ORDER ROLLERS.' AS CONFIGURED, THE ENGINE WOULD EXPERIENCE UNACCEPTABLE 6TH ORDER TORSIONAL VIBRATIONS.
Probable Cause: INCORRECT INSTALLATION OF CRANKSHAFT COUNTERWWEIGHT ROLLERS BY THE MANUFACTURER DURING REMANUFACTURE OF THE ENGINE. FACTOR WAS THE INADEQUATE SURVEILLANCE OF THE ENGINE ASSEMBLY PROCESS BY THE MANUFACTURER.
Accident investigation:
 |
|
Sources:
NTSB ANC92IA001
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2024 15:01 | ASN Update Bot | Added |
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