The incident is thought to concern an uninterruptible power supply (UPS) which delivers a smooth flow of power from the mains, with a fall-back to a battery back-up and a diesel generator.
This week BA’s parent company, International Airlines Group (IAG) admitted that the supply to Boadicea House, a data centre, was temporarily lost. An internal investigation found that the UPS, believed to have been supplied by Hitec Power Protection, was functioning correctly at the time.
One BA source said it was rumoured that a contractor doing maintenance inadvertently switched the supply off, although this has not been confirmed.
An internal email from Bill Francis, head of group IT at IAG, appeared to confirm this version of events. The email, leaked to the Press Association, said: “This resulted in the total immediate loss of power to the facility, bypassing the backup generators and batteries . . . It was turned back on in an unplanned and uncontrolled fashion, which created physical damage to the system.”