ASN Wikibase Occurrence # 352474
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| Date: | Thursday 7 October 1999 |
| Time: | 10:15 LT |
| Type: |  Bell 206B |
| Owner/operator: | Arizona Heliservices Inc. |
| Registration: | N6624N |
| MSN: | 3169 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 6335 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Apache Junction, AZ -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Willcox, AZ (P33) |
| Mesa, AZ (KFFZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise flight about 600 feet agl, the pilot noticed that the engine oil pressure was high and the torque gauge was exceeding the high limits. The engine chip light became illuminated. As the pilot descended to make an immediate landing, the engine quit about 75 to 100 feet agl. The pilot autorotated to the ground. The main rotor blades severed the tail cone aft of the horizontal stabilizer after the toe of the left skid became entangled in a large bush and separated. A teardown examination of the engine was conducted. The mechanic reported that the Nos. 6 and 7 bearings displayed evidence of heat distress and oil starvation. When he blew through the oil jet for the Nos. 6 and 7 bearings, he heard something pop out. He opined that it might have been a piece of carbon, which could have prevented the flow of oil into the turbine. He stated that all other components of the lubrication system were intact and functional. No other discrepancies were found.
Probable Cause: Oil starvation and seizure of the engines Nos. 6 and 7 bearings due to a clogged oil jet, which resulted in a total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB LAX00LA055
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 16:44 | ASN Update Bot | Added |
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