ASN Wikibase Occurrence # 293264
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| Date: | Monday 1 August 2005 |
| Time: | 09:40 LT |
| Type: | Grumman G-164A Turbo Ag-Cat |
| Owner/operator: | First State Aerial Applicators Inc |
| Registration: | N5495 |
| MSN: | 1029 |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 5523 hours |
| Engine model: | Garrett TPE331-43A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Felton, Delaware -
 United States of America
|
| Phase: | Unknown |
| Nature: | Agricultural |
| Departure airport: | Felton, DC |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While returning to a private airstrip, the pilot heard a loud explosion from the engine. The engine lost all power, and the pilot performed a forced landing to a soybean field. During the landing, the right wing contacted the ground and the airplane came to rest inverted. The airplane was equipped with a Honeywell (Garrett) TPE331-43A turboprop engine. Examination of the engine revealed that the second stage turbine rotor was fractured, separated, and lodged in the back of the engine. The second stage turbine stator seal plate assembly exhibited warpage. The evidence was consistent with the warped second stage turbine stator seal plate contacting the second stage turbine rotor, causing the rotor to separate. Airworthiness directive (AD) 86-08-06 R1 pertained to the accident engine, and required an x-ray inspection of the second stage turbine stator seal plate assembly. The purpose of the AD was to detect and repair engines with second stage turbine stator seal plate assemblies that exhibited warpage. The last annual inspection of the airplane was performed about 4 months prior to the accident. According to the aircraft logbooks, the airframe and powerplant mechanic with an inspection authorization (IA) noted the AD as not applicable due to engine model number. However, the subject engine model number did require completion of the AD.
Probable Cause: The mechanic's inadequate annual inspection, and failure to comply with an airworthiness directive, which resulted in a total failure of the second stage turbine rotor.
Accident investigation:
 |
|
Sources:
NTSB NYC05LA126
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Oct-2022 18:00 | ASN Update Bot | Added |
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