ASN Wikibase Occurrence # 384004
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| Date: | Friday 2 July 1982 |
| Time: | 13:30 LT |
| Type: |  Hughes 369B |
| Owner/operator: | Sondma County Sheriff |
| Registration: | N1108T |
| MSN: | 611000D |
| Total airframe hrs: | 463 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Jenner, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Santa Rosa, CA (C ) |
| Santa Rosa, CA (C ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
HELICOPTER WAS ON ROUTINE POLICE PATROL WHEN ENGINE FAILED AND IT AUTOROTATED TO A ROUGH LANDING ON A ROCKY BEACH. THE 1ST STAGE OF THE GAS PRODUCER SECTION OF THE TURBINE WAS FOUND FROZEN. THE TURBINE WHEEL BLADES WERE RUBBING & SEIZED TO THE 1ST STAGE TURBINE SHROUD OF THE 2ND STAGE NOZZLE ASS'Y. PIECES OF THE TURBINE BLADE'S TRAILING EDGE TIPS WERE MISSING & THERE WAS A METAL BUILDUP ON THE 2ND STAGE NOZZLE BLADE TRACK AREA. DURING DISASSEMBLY THE 1ST STAGE WHEEL HAD TO BE FORCED APART TO BREAK IT LOOSE OF THE 2ND STAGE NOZZLE. FRACTURES OF THE BLADE TIPS APPEARED TO BE CAUSED BY ELEVATED TEMPERATURE CREEP RESULTING FROM EITHER TRANSIENT OVERTEMPERATURE OR OVERSPEED CONDITIONS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB LAX82FA247
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Apr-2024 06:39 | ASN Update Bot | Added |
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