ASN Wikibase Occurrence # 30272
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| Date: | Thursday 20 January 2000 |
| Time: | 13:30 |
| Type: |  Bell UH-1H |
| Owner/operator: | Lee County Mosquito Control |
| Registration: | N853M |
| MSN: | 68-16087 |
| Year of manufacture: | 1969 |
| Total airframe hrs: | 6215 hours |
| Engine model: | Lycoming T-53-L-13B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Fort Myers, FL -
 United States of America
|
| Phase: | En route |
| Nature: | Test |
| Departure airport: | Lehigh Acres, FL (X56) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the pilot, he was about 30 minutes into the post inspection maintenance flight at about 350 to 400 feet agl, when he heard a loud 'bang' and engine rpm decayed to zero. His choice of autorotation site required use of main rotor rpm to clear trees and he landed hard and rolled over. The T-53-L-13B engine underwent factory disassembly examination, with FAA oversight. Material analysis determined that portions of the 2nd stage GP turbine disc had fractured and separated due to peak strain low cycle fatigue, resulting in structural and imbalance damage and engine failure. No material, lubrication, or fuel control defects were identified that would have contributed to the disc separation.
Probable Cause: A total loss of engine power due to turbine wheel fracture resulting from fatigue for undetermined reasons that resulted in an autorotation to unsuitable terrain and hard touchdown and rollover.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X20419&key=1
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 28-Oct-2017 16:59 | TB | Updated [Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Source, Damage, Narrative] |
| 12-Dec-2017 18:18 | ASN Update Bot | Updated [Time, Cn, Operator, Nature, Departure airport, Source, Damage, Narrative] |
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