ASN Wikibase Occurrence # 59044
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| Date: | Wednesday 25 March 2009 |
| Time: | 09:34 |
| Type: |  de Havilland Canada DHC-8-402Q Dash 8 |
| Owner/operator: | Japan Air Commuter |
| Registration: | JA847C |
| MSN: | 4111 |
| Fatalities: | Fatalities: 0 / Occupants: 46 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | 4 nm from Tanegashima -
 Japan
|
| Phase: | Initial climb |
| Nature: | Passenger - Scheduled |
| Departure airport: | Tanegashima Airport (TNE/RJFG) |
| Kagoshima Airport (KOJ/RJFK) | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A DHC-8-402, registered JA847C, operated by Japan Air Commuter as regularly scheduled Flight 3760, took off from Tanegashima Airport. At about 09:34, while the aircraft was climbing, an abnormal noise emanated from the No. 1 engine and instrument indications showed the occurrence of engine failure. The engine was then shut down and the aircraft requested emergency landing clearance from the Kagoshima Radar Approach Control Facility. The aircraft landed at Kagoshima Airport at 10:26.
PROBABLE CAUSE:
It is highly probable that this serious incident occurred through the following series of events:
While the Aircraft was climbing after takeoff, the RGB helical input gearshaft of the No. 1 engine sustained fatigue fracture and was detached from its position; the fragments of the broken shaft then flew off, damaging the engine case and breaking the blades of the HPT and the blades and vanes of the LPT and PT at the downstream stages, and this resulted in breakdown of the engine.
With regard to the fatigue fracture of the RGB helical input gearshaft, it is considered probable that fatigue cracks had started from the impurity inclusion present in the metal stock of the helical gear developed in the shaft, and after undergoing repetitive application of stress, the shaft was finally fractured.
Two safety recommendations were made on quality control and risk assessment.
Accident investigation:
 |
|
Sources:
http://www.mlit.go.jp/jtsb/eng-air_report/JA847C.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Mar-2009 12:16 | Certosino | Added |
| 29-Mar-2009 12:17 | harro | Updated |
| 30-Aug-2010 14:01 | harro | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 01-Aug-2015 12:01 | Aerossurance | Updated [Source, Narrative] |
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