ASN Wikibase Occurrence # 30968
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| Date: | Tuesday 19 May 1998 |
| Time: | 11:15 LT |
| Type: |  Bell UH-1H |
| Owner/operator: | Reynolds Aviation Inc. |
| Registration: | N98NW |
| MSN: | 64-13822 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 13590 hours |
| Engine model: | Lycoming T53-L-13B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hope, Idaho -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | , ID |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that he had dropped off a load of chokers and was maneuvering to hook up to a load of logs when the engine began to make 'a weird squealing noise, followed by a constant series of compressor stalls, occurring about twice per second.' The airplane then lost all engine power, and the pilot performed a forced landing in a clearing. Post Crash Examination revealed that the No. 1 bearing (P/N:1-300-015-04; S/N:127AC) was heavily damaged. From observations of damage on the bearing raceways and the inner ring split faces, evidence indicated that both thrust and non-thrust sides of the inner ring had been misaligned, based upon ball path indications. Military records for the engine included an Unserviceable Tag. No evidence was found of specifics related to that failure code, nor was evidence found recording related corrective maintenance action
Probable Cause: Failure of a misaligned main bearing in the engine. Factors include returning a previously unairworthy-tagged engine to service by the operator's maintenance personnel without sufficient information to identify and correct an unknown engine deficiency.
Accident investigation:
 |
|
Sources:
NTSB SEA98FA077
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 31-Oct-2011 23:07 | Dr. John Smith | Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Source, Damage, Narrative] |
| 07-Apr-2024 12:24 | ASN Update Bot | Updated [Time, Cn, Operator, Other fatalities, Nature, Departure airport, Source, Damage, Narrative, Category, Accident report] |
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