ASN Wikibase Occurrence # 152711
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| Date: | Saturday 5 March 2011 |
| Time: | 06:50 UTC |
| Type: |  Airbus A320-214 |
| Owner/operator: | Finnair |
| Registration: | OH-LXL |
| MSN: | 2146 |
| Year of manufacture: | 2003 |
| Engine model: | CFMI CFM56-5B4/P |
| Fatalities: | Fatalities: 0 / Occupants: 146 |
| Aircraft damage: | None |
| Location: | over Island of Öland -
 Sweden
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Helsinki-Vantaa Airport (HEL) |
| London-Heathrow Airport (LHR/EGLL) | |
| Confidence Rating: |  Information is only available from news, social media or unofficial sources |
A pressurisation failure led to a serious incident on Finnair flight AY831. An Airbus A320-214 airliner, registration OH-LXL, was on a scheduled flight from Helsinki to London. The aircraft departed with Bleed No.1 inoperative according to Minumum Equipment List (MEL).The aircraft was flying in Swedish airspace, north of the Island of Öland at Flight Level 360 with both air conditioning packs supplied by Bleed No.2 and cross bleed valve opened. Ten minutes after reaching cruise altitude, the remaining bleed (Bleed No.2) failed. As a result of this, the flight crew had to execute a rapid descent to a safe altitude.
This serious incident was caused by rising Cabin Pressure which, in turn, could have been the result of a failure of the Fan Air Valve (FAV) or Temperature Control Thermostate (TCT) grid filter clogging in the right engine's bleed air system (Bleed No.2).
With the other system being inoperative for flight, the cooling capacity of only one system proved insufficient. The pre-cooled air was too hot, therefore the temperature sensor of the system worked as per its design and shut off the overheated system.
The Safety Investigation Authority, Finland recommends that the EASA oblige Airbus to compile all engine bleed air failure-related emergency procedures that pilots use, and display the complete set of instructions on the ECAM.
The Safety Investigation Authority, Finland also recommends that the EASA oblige Airbus to amend the Operations Engineering Bulletin (OEB) in a manner that clearly segregates the procedures for prior to the flight and during the flight. Additionally Airbus needs to assure that all the appropriate actions included in the OEB are in line with Quick Reference Handbook (QRH).
Sources:
http://www.turvallisuustutkinta.fi/en/Etusivu/1347274036437
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Jan-2013 13:26 | harro | Added |
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