ASN Wikibase Occurrence # 314498
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| Date: | Friday 20 May 2011 |
| Time: | 20:10 LT |
| Type: |  Boeing 737-8AS (WL) |
| Owner/operator: | Ryanair |
| Registration: | EI-DLI |
| MSN: | 33591/1894 |
| Year of manufacture: | 2006 |
| Fatalities: | Fatalities: 0 / Occupants: 56 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | E of Dublin -
 Ireland
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Liverpool-John Lennon International Airport (LPL/EGGP) |
| Dublin Airport (DUB/EIDW) | |
| Investigating agency: | AAIU Belgium |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a scheduled passenger flight between Liverpool (EGGP) and EIDW, while in the cruise at FL180, the Cabin Altitude Warning Horn sounded. The Flight Crew identified that both air-conditioning pack switches were in the OFF position. The packs were then selected to AUTO.
Subsequently, the crew doubted the operation of the pressurization system and an emergency descent was carried out. The aircraft entered a hold at 6,000 ft to allow the Flight Crew to review and confirm their understanding of events and the status of the aircraft. The aircraft landed without further incident. No injuries were reported.
Probable Cause
1. The Air Conditioning Packs were not selected to AUTO following engine start.
Contributory Cause(s)
1. The “After Start” checks and the checks at 3,000 ft and 10,000 ft did not identify the mis-configuration or that the aircraft was not pressurising.
2. Concern about the effectiveness of the pressurization system after both packs had been selected to AUTO caused an emergency descent to be initiated and the manual deployment of the cabin oxygen masks.
3. Sub-optimal CRM and a flat authority gradient.
Accident investigation:
 |
|
Sources:
NTSB DCA11WA062
History of this aircraft
Other occurrences involving this aircraft
| 4 June 2014 | EI-DLI | Ryanair | 0 | Roma-Ciampino Airport (CIA) |  |
unk |
| Collision with Ground support equipment | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Jun-2023 17:54 | ASN Update Bot | Added |
| 05-Aug-2023 10:26 | harro | Updated |
Corrections or additions? ... Edit this accident description
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