ASN Wikibase Occurrence # 247162
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| Date: | Thursday 27 December 2001 |
| Time: | 11:45 LT |
| Type: |  Airbus A320-211 |
| Owner/operator: | All Nippon Airways - ANA |
| Registration: | JA8947 |
| MSN: | 685 |
| Year of manufacture: | 1997 |
| Engine model: | CFMI CFM56-5A1 |
| Fatalities: | Fatalities: 0 / Occupants: 55 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | 75 km NW of Toyama City -
 Japan
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Niigata Airport |
| Okinawa-Naha Airport | |
| Investigating agency: | ARAIC |
| Confidence Rating: |  Accident investigation report completed and information captured |
ANA flight 465 experienced a drop in cabin air pressure while en route at FL350. The flight crew carried out an emergency descent and diverted to Osaka.
PROBABLE CAUSE:
In this serious incident, it is estimated that while the aircraft was operating at an altitude of 35,000ft for the first time since the replacement of the safety valves, the gate of a safety valve opened at a differential pressure lower than the specified limit and this open condition persisted. As a result there was a decrease in cabin pressure. It is estimated that the opening of the gate of the safety valve below the specified pressure limit and the persistence of its open condition was caused mutually by the existence of anomalies in the stem assembly and an inappropriate shim adjustment, both at the time of manufacture of the said valve.
Accident investigation:
 |
|
Sources:
JTSB
History of this aircraft
Other occurrences involving this aircraft
| 2 October 2015 | JA8947 | All Nippon Airways - ANA | 0 | Osaka International Airport/Itami (ITM/RJOO) | |
sub |
| Engine failure | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Jan-2021 18:43 | harro | Added |
Corrections or additions? ... Edit this accident description
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