ASN Wikibase Occurrence # 72061
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| Date: | Sunday 21 September 2008 |
| Time: | 12:38 |
| Type: |  Boeing 747-337 |
| Owner/operator: | Air India |
| Registration: | VT-EPW |
| MSN: | 24159/711 |
| Year of manufacture: | 1988 |
| Fatalities: | Fatalities: 0 / Occupants: 182 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | 10 km S of Tokyo-Narita Airport (NRT/RJAA) -
 Japan
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Tokyo-Narita Airport (NRT/RJAA) |
| Delhi-Indira Gandhi International Airport (DEL/VIDP) | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On September 21, 2008, at 12:29 Japan Standard Time, a Boeing 747-337, registered VT-EPW, operated by Air India, took off from Narita International Airport on Flight AI307. At about 12:38, while the aircraft was climbing in airspace about 10 km south of Narita International Airport bound for Indira Gandhi International Airport (India), an abnormal noise emanated from the No. 3 engine at an altitude of 15,700 ft, together with an instrument indication showing an abnormality with the engine. The engine in question was then shut down and fuel was jettisoned before the aircraft turned back to Narita International Airport and landed at 13:50.
There were 182 people on board, consisting of the Pilot in Command, 13 other crewmembers and 168 passengers. No one was injured.
PROBABLE CAUSE
It is considered highly probable that this serious incident occurred through the following process. While the Aircraft was climbing after takeoff, nozzle guide vanes of the No. 3 engine LPT STG-2 separated and scattered after fracturing due to intergranular corrosion, and this caused the breakage of the nozzle guide vanes and turbine blades of the downstream stages and eventually damaged the engine.
With regard to the fracture of the nozzle guide vanes due to intergranular corrosion, it is considered highly probable that the inner wall surfaces of the nozzle guide vanes that, unlike the outer surfaces, had no oxidation resistant coating were susceptible to oxidation and corrosion in the grain boundaries, and this led to progressive material degradation and decrease in strength, ultimately resulting in fracture of the vanes starting from the inside walls.
Accident investigation:
 |
|
Sources:
http://www.mlit.go.jp/jtsb/eng-air_report/VT-EPW.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Jan-2010 11:02 | harro | Added |
Corrections or additions? ... Edit this accident description
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