ASN Wikibase Occurrence # 362581
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| Date: | Monday 21 December 1992 |
| Time: | 16:00 LT |
| Type: |  Hughes 369D |
| Owner/operator: | Mauna Kea Helicopters |
| Registration: | N113RS |
| MSN: | 590506D |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 6928 hours |
| Engine model: | Allison 250 C20B |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hilo, HI -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Kamuela, HI (MUE) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING CRUISE THE PILOT DETECTED A BUFFETING IN THE AIRFRAME FOLLOWED BY A LEFT YAW. THE ENGINE GAGES INDICATED DECREASING POWER OUTPUT WITH A HIGH TURBINE OUTLET TEMPERATURE, AND, THE ENGINE CHIP AND FAILURE LIGHTS ILLUMINATED. THE PILOT EXECUTED AN AUTO ROTATION AND HAD TO STRETCH THE GLIDE SLIGHTLY TO REACH THE ONLY SUITABLE AREA WHICH INVOLVED A DOWN WIND LANDING. THE MAIN ROTOR SLICED OFF THE TAIL BOOM AS THE HELICOPTER SLID TO A STOP. REVIEW OF THE OPERATORS DAILY FLIGHT SHEETS FOR THE ACCIDENT HELICOPTER REVEALED THAT A ENGINE CHIP LIGHT HAD ILLUMINATED ON THE FLIGHT PRIOR TO THIS ONE. THE CORRECTIVE ACTION TAKEN WAS TO CLEAN THE CHIP PLUG AND REINSTALL IT. NO TEST FLIGHT AND FURTHER CHECK OF THE PLUG WAS DONE AS REQUIRED IN THE MAINTENANCE MANUALS. DISASSEMBLY OF THE ENGINE REVEALED THAT THE NUMBER 1 AND 2 BEARINGS IN THE COMPRESSOR MODULE HAD FAILED. REVIEW OF MAINTENANCE RECORDS REVEALED THAT THE COMPRESSOR MODULE WAS FORMERLY INSTALLED IN AN ENGINE WHICH WAS INVOLVED IN A HELICOPTER ACCIDENT IN MAY OF 1992. THE COMPRESSOR MODULE WAS NOT DISASSEMBLED FOR INSPECTION AS REQUIRED IN THE OVERHAUL AND MAINTENANCE MANUAL, AND WAS NOT SIGNED OFF FOR RETURN TO SERVICE. IT WAS INSTALLED BY THE OPERATOR IN THE ACCIDENT HELICOPTER ENGINE ON NOVEMBER 21, 1992.
Probable Cause: THE BEARING FAILURES DUE TO THE OPERATOR'S USE OF IMPROPER MAINTENANCE INSPECTION AND OVERHAUL PROCEDURES BY INSTALLING AN UNSERVICEABLE COMPRESSOR MODULE IN THE HELICOPTER ENGINE. FACTORS IN THE ACCIDENT WERE THE UNSUITABLE NATURE OF THE TERRAIN FOR THE FORCED LANDING AND THE TAIL WIND CONDITION DURING THE LANDING TOUCHDOWN.
Accident investigation:
 |
|
Sources:
NTSB LAX93LA071
History of this aircraft
Other occurrences involving this aircraft
| 25 March 1994 | N113RS | Mauna Kea Helicopters | 0 | Hi. Nat'l Park, HI | |
sub |
| 12 January 1999 | C-GSSN | Rupert's Land Operations | 1 | 36 NM SW of Fox Creek, AB, Alberta |  |
unk |
| Fuel exhaustion | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 08:07 | ASN Update Bot | Added |
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