ASN Wikibase Occurrence # 358415
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| Date: | Friday 18 August 1995 |
| Time: | 13:48 LT |
| Type: |  British Aerospace 3201 Jetstream 31 |
| Owner/operator: | Trans State Airlines |
| Registration: | N425AM |
| MSN: | 870 |
| Total airframe hrs: | 9777 hours |
| Engine model: | Garrett TPE-331-12 |
| Fatalities: | Fatalities: 0 / Occupants: 18 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Champaign, IL -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | St Louis, MO (KSTL) |
| (KCMI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane sustained minor damage following an uncontained failure of the number two engine during approach. The crew received a fire indication of the number two engine. They secured the engine and discharged the nacelle fire extinguishing system. They landed and evacuated the airplane without further incident. Examination revealed several penetrations of the right fuselage side and number two cowling. The gearbox housing had a hole at the 12 o'clock position in the plane of rotation of the helical drive (bull) gear. The combustion plenum had a hole at the five o'clock position. Fragments of the bull gear were recovered from within the gear box. Metallurgical examination of the bull gear revealed a fatigue crack that emanated from the root radius of a gear tooth. The crack progressed to an area of the fracture that contained 'features typical of overstress separation.' The hole in the combustion plenum was attributed to excessive temperature. No other metallurgical anomaly was noted.
Probable Cause: fatigue cracking and subsequent catastrophic failure of the number two engine helical drive (bull) gear, which resulted in an overtemperature condition, bursting of the combustion plenum, and a subsequent in-flight fire.
Accident investigation:
 |
|
Sources:
NTSB CHI95IA286
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 13:12 | ASN Update Bot | Added |
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