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) |
Destination airport: | Concord, CA (KCCR) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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:
|
| |
Investigating agency: | NTSB |
Report number: | LAX89LA141 |
Status: | Investigation completed |
Duration: | 3 years and 2 months |
Download report: | Final report |
|
Sources:
NTSB LAX89LA141
Location
Revision history:
Date/time | Contributor | Updates |
24-Mar-2024 09:53 |
ASN Update Bot |
Added |
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