ASN Wikibase Occurrence # 378151
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| Date: | Sunday 4 November 1984 |
| Time: | 22:45 LT |
| Type: |  Westland 30-100 |
| Owner/operator: | Evergreen Helicopters Of Ak |
| Registration: | N5840T |
| MSN: | 006 |
| Total airframe hrs: | 16927 hours |
| Engine model: | Rolls-Royce GEM 510 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Santa Ana, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Santa Ana, CA (KSNA) |
| Los Angeles, CA (KLAX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING A CLIMB TO CRUISE, THE CREW EXPERIENCED CONTROL DIFFICULTIES WHEN THE FOR-&-AFT TRIM ACTUATOR BEGAN TO MOTOR FORWARD AND WOULD NOT STOP. AN EMERG DESCENT WAS MADE WITH BOTH PLTS EXERTING AFT CYCLIC PRESSURE TO PREVENT THE SPEED FROM INCREASING OVER 120 KTS. THE ACFT RETURNED SUCCESSFULLY TO THE DEPARTURE ARPT. ALL GAGES INDICATED NORMAL AND NO WARNING LIGHTS WERE OBSERVED. AN INVESTIGATION REVEALED A FATIGUE FAILURE OF THE FB 10 ELECTRICAL RELAY AND SUBSEQUENT FOULING OF THE CONTACT OPERATION BY A BROKEN FRAGMENT. THE RELAY SPRING FAILED FROM FATIGUE, INITIATED AS MICRO CRACKS WHICH RESULTED FROM COLD FORMING BENDING AND SUBSEQUENT STRAIGHTENING PROCESS DURING MANUFACTURE.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB LAX85IA040
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Mar-2024 20:21 | ASN Update Bot | Added |
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