ASN Wikibase Occurrence # 375840
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| Date: | Sunday 8 December 1985 |
| Time: | 16:20 LT |
| Type: |  Mooney M20E |
| Owner/operator: | Private |
| Registration: | N5516Q |
| MSN: | 611 |
| Total airframe hrs: | 2528 hours |
| Engine model: | LYCOMING IO-360-A1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Selma, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | San Jose, CA (KRHV) |
| Bakersfield, CA (KBFL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING CRUISE ON A VFR X-COUNTRY FLT, THE PLT STATED THAT THE ENG BECAME ROUGH WITH MODERATE VIBRATION LEVELS. AFTER SHUTTING DOWN THE ENG, THE PLT MADE A FORCED LANDING IN A FLD, COLLIDED WITH GND OBSTRUCTIONS & COLLAPSED ALL 3 LANDING GEAR. EXAMINATION OF THE ENG REVEALED THAT THE NUTS ON THE HOLD DOWN STUDS FOR THE #3 CYLINDER HAD BACKED OFF WHICH OVERSTRESSED THE REMAINING NUTS & CAUSED THEM TO FAIL. THE #3 CYLINDER WAS FOUND SEPARATED FROM THE CASE. ACCORDING TO THE IA WHO EXAMINED THE ENG, THE NUTS ON THE NUMBERS 3 & 4 CYLINDERS WERE UNDERTORQUED DURING A PRIOR MAINTENANCE PERIOD. THE IMPROPER TORQUE LEVELS ALLOWED SOME OF THE NUTS TO LOOSEN & EVENTUALLY BACK OFF, PRECIPITATING THE SEQUENCE OF EVENT.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB LAX86LA059
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Mar-2024 10:08 | ASN Update Bot | Added |
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