LONDON (AP) — Malaysia Airlines failed to properly preserve flight recordings during an incident at London’s Heathrow Airport in 2012 when a plane had to turn back because of technical problems, a report by Britain’s air accidents investigator found Thursday.

The report was published as search teams continue to hunt for the airline’s missing Flight 370, which disappeared in an unrelated incident last month on its way from Kuala Lumpur to Beijing with 239 people aboard. Experts hope that if wreckage from that plane is found it will include the black box, considered crucial to understanding what went wrong on the flight.