ASN Wikibase Occurrence # 30968
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Date: | Tuesday 19 May 1998 |
Time: | 10:15 |
Type: | Bell UH-1H |
Owner/operator: | Reynold Aviation |
Registration: | N98NW |
MSN: | 4529 |
Year of manufacture: | 1965 |
Total airframe hrs: | 13590 hours |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | Hope, Idaho -
United States of America
|
Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
Nature: | Agricultural |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
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.
The wreckage was released to the owner's representative, on February 5, 1999. The wreckage remained in storage at Northwest Helicopters' facility in Olympia, Washington.
Sources:
https://www.ntsb.gov/aviationquery/brief2.aspx?ev_id=20001211X10185&ntsbno=SEA98FA077&akey=1
History of this aircraft
Other occurrences involving this aircraft 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] |
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