ASN Wikibase Occurrence # 247199
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| Date: | Sunday 8 May 2005 |
| Time: | |
| Type: |  Boeing 747-446 |
| Owner/operator: | Japan Airlines |
| Registration: | JA8072 |
| MSN: | 24424/760 |
| Year of manufacture: | 1990 |
| Fatalities: | Fatalities: 0 / Occupants: 374 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | 370 km SE of New Chitose Airport -
 Japan
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | New York-John F. Kennedy International Airport, NY (JFK/KJFK) |
| RJAA | |
| Investigating agency: | ARAIC |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
A Boeing 747-400, JA8072, operated as Japan Airlines International Co., Ltd., scheduled Flight 47, took off from John F. Kennedy International Airport at 23:14 JST on May 7 , 2005, bound for Narita International Airport. Around 11:41 JST on May 8, in response to a warning indicating drop of cabin pressure while flying at an altitude of approximately 36,000 ft, passenger oxygen masks were deployed by the crew and the aircraft made an emergency descent to an altitude of approximately 10,000 ft. Subsequently, the destination was changed to New Chitose Airport and, at 12:51 the aircraft landed there. Of the total of 374 people on board, consisting of the Pilot in Command(PIC) and other 18 crew members and 355 passengers, no one was injured.
PROBABLE CAUSE
It is estimated that this serious incident was caused by excessive opening of Out Flow Valve (OFV) in cabin pressure control system, which resulted in reduction of cabin pressurization while the aircraft was cruising.
The reason for the excessive opening of the OFVs is considered that Cabin Pressure Controller(CPC) controlled the Out Flow Valves towards open position based on the erroneous indication of pressure difference, which resulted from certain failures. As tests conducted after the landing, which include self-test of the cabin pressure control system and functional tests of the individual components, revealed no discrepancies, the cause for the erroneous indication of pressure difference could not be identified.
Accident investigation:
 |
|
Sources:
JTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Jan-2021 20:33 | harro | Added |
| 31-Jan-2021 10:44 | harro | Updated [Aircraft type, Cn, Narrative] |
Corrections or additions? ... Edit this accident description
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