To ask Her Majesty’s Government whether the Air Accidents Investigation Branch (AAIB) discussed the emergency diversion of flight BA 286 to Vancouver on 25 October with the Aircraft Commander or any of the crew before deciding not to investigate reports of “toxic fumes” and what was the reason for the decision.
Lord Ahmad of WimbledonParliamentary Under-Secretary of State (Department for Transport) (Jointly with the Home Office), Parliamentary Under-Secretary (Department for Transport)
The Air Accidents Investigation Branch (AAIB) were notified of the diversion of the British Airways flight BA 286 to Vancouver by the Canadian Transport Safety Board. Canada, as the State of Occurrence under the international protocols, is responsible for conducting any investigation.
The AAIB did not conduct any inquiries with the Aircraft Commander or crew. The Canadian Transport Safety Board, working closely with British Airways and Airbus technicians carried out an investigation, but were unable to determine the cause. The aircraft returned to service and British Airways continue to monitor key flights. To date no further reports have been made.
Full Q&A here