ASN Wikibase Occurrence # 280296
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| Date: | Monday 11 July 2022 |
| Time: | 06:30 LT |
| Type: |  Air Tractor AT-502B |
| Owner/operator: | Adams Aerial Solutions LLC |
| Registration: | N5850R |
| MSN: | 502B-0685 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 5975 hours |
| Engine model: | Pratt & Whitney Canada PT6A-34AG |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Decatur Airport (DEC/KDEC), Decatur, IL -
 United States of America
|
| Phase: | Take off |
| Nature: | Agricultural |
| Departure airport: | Decatur Airport, IL (DEC/KDEC) |
| Decatur Airport, IL (DEC/KDEC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During departure climbout for spray operations, the pilot heard a “pop' and observed white smoke trailing the airplane. The pilot made a forced landing, during which the airplane struck an airport perimeter fence that resulted in substantial damaged to both wings.
Examination revealed that all compressor turbine (CT) rotor blades were fractured at varying spanwise locations. The power turbine (PT) rotor blades downstream of the CT blades exhibited impact damage and were fractured at varying spanwise locations.
Metallurgical analysis of the CT blades revealed micro-voids were present along the material grain boundaries and rafting of the gamma prime which were indicative of creep. Metallurgical analysis of the CT blades revealed solutioning of the gamma prime which is consistent with exposure to temperature in excess of the engine operating limits. It was not determined if the exposure to elevated temperatures occurred before or during the event.
Probable Cause: Fracture of the compressor turbine (CT) blades due to creep.
Accident investigation:
 |
|
Sources:
NTSB CEN22LA312
FAA register: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=5850R
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Jul-2022 21:07 | Geno | Added |
| 12-Jul-2022 11:07 | Captain Adam | Updated [Aircraft type, Registration, Cn, Operator, Source, Damage, Narrative] |
| 12-Jul-2022 13:23 | johnwg | Updated [Destination airport, Source, Narrative, Category] |
| 20-Jul-2022 16:41 | AgOps | Updated [Source, Narrative] |
| 03-Mar-2024 15:45 | ASN Update Bot | Updated [Time, Other fatalities, Source, Narrative, Accident report] |
Corrections or additions? ... Edit this accident description
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