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ASN Wikibase Occurrence # 224219
Last updated: 22 April 2019
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Date:29-APR-2017
Time:10:40 UTC
Type:Silhouette image of generic B789 model; specific model in this crash may look slightly different
Boeing 787-9 Dreamliner
Owner/operator:British Airways
Registration: G-ZBKF
C/n / msn: 38622/392
Fatalities:Fatalities: 0 / Occupants: 137
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:east of Brussels -   Belgium
Phase: En route
Nature:International Scheduled Passenger
Departure airport:London-Heathrow Airport (LHR/EGLL)
Destination airport:Delhi-Indira Gandhi International Airport (DEL/VIDP)
Investigating agency: AAIB
Narrative:
The aircraft was on a scheduled flight BA143 from London Heathrow to New Delhi, India. The aircraft was dispatched in accordance with the Minimum Equipment List (MEL) with the left air conditioning (AC) system disabled. Shortly after reaching FL350 the crew were alerted by EICAS that the cabin altitude was increasing above normal, triggered at 8,500 feet. With no additional Environmental control system (ECS) actions available to control cabin altitude, the flight crew initiated a descent. During this descent the cabin altitude exceeded 10,000 ft and the crew completed the relevant emergency actions.
The loss of cabin pressurisation was caused by detachment of the lower right air conditioning recirculation fan duct on a sector where the left air conditioning system had been disabled before flight. As a consequence of this finding, the Aircraft Maintenance Manual has been amended to alter the process of replacing the relevant recirculation fan and maintenance procedures to react to a related Maintenance Alert Message have been altered.

Sources:

AAIB

Accident investigation:
cover
  
Investigating agency: AAIB
Status: Investigation completed
Duration: 1 year and 11 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
22-Apr-2019 11:49 harro Added
22-Apr-2019 11:50 harro Updated [Cn]

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