ASN Wikibase Occurrence # 352516
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| Date: | Sunday 26 September 1999 |
| Time: | 11:03 LT |
| Type: |  IAI 1124A Westwind II |
| Owner/operator: | Aero Jet Inc |
| Registration: | N666K |
| MSN: | 321 |
| Total airframe hrs: | 9635 hours |
| Engine model: | Garrett TFE-731-3-1G |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Nantucket, MA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Nantucket, MA (ACK) |
| Gaithersburg, MD (GAI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in a climb after departure, the left engine failed. All procedures were accomplished to secure the engine and the airplane landed uneventfully. Examination of the airplane revealed extensive damage to the left engine nacelle and turbine section. The first stage low pressure turbine rotor disk was found separated from the low-pressure turbine shaft, and had penetrated the inner stage transition liner. The engine was removed from the airplane and disassembled. The disassembly revealed the first stage low-pressure turbine (LPT) had a piece of the web and rim, missing outboard of the curvic coupling. Metallurgical examination of the ruptured first stage LPT disk revealed a high cycle fatigue failure that originated from the subsurface location. The disk's dimensions adjacent to the fracture and the disk's material properties conformed to engineering specifications.
Probable Cause: A fractured turbine wheel.
Accident investigation:
 |
|
Sources:
NTSB NYC99IA239
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 20:32 | ASN Update Bot | Added |
| 07-Mar-2024 20:38 | ASN | Updated [Aircraft type, Cn, Departure airport, Narrative] |
| 07-Mar-2024 20:38 | ASN | Updated [Aircraft type] |
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