ASN Wikibase Occurrence # 369008
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| Date: | Thursday 30 March 1989 |
| Time: | 19:25 LT |
| Type: |  Hughes 369D |
| Owner/operator: | Helinet, Inc. |
| Registration: | N5108E |
| MSN: | 811075D |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 1697 hours |
| Engine model: | Allison C250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Vallejo, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Novato, CA (056) |
| Concord, CA (KCCR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING AN AIR TAXI CARGO FLIGHT ENGINE POWER WAS SUDDENLY LOST & THE PILOT AUTOROTATED TO A LANDING ON A WET MARSH. AS THE AIRCRAFT CAME TO REST THE MAIN ROTORS SEVERED THE TAIL BOOM. EXAM OF THE ENGINE REVEALED THAT THE PC TUBE ASSEMBLY, P/N 6848471, HAD FAILED AT THE SCROLL FITTING FERRULE, & THIS BROKEN LINE CONDITION PRODUCED AN IMMEDIATE LOSS OF ENGINE POWER. THE PC TUBE HAD A TOTAL OF 11.8 HOURS OF USE SINCE BEING INSTALLED/MANUFACTURED. A METALLURGICAL FAILURE ANALYSIS REVEALED THAT THE PC TUBE HAD FAILED IN FATIGUE.
Probable Cause: FATIGUE FAILURE OF A DEFECTIVE PC TUBE ASSEMBLY RESULTING IN A LOSS OF ENGINE POWER. A CONTRIBUTING FACTOR WAS THE UNSUITABLE TERRAIN.
Accident investigation:
 |
|
Sources:
NTSB LAX89LA141
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Mar-2024 09:53 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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