The UK’s Air Accidents Investigation Branch’s preliminary report on the May 24 incident involving a British Airways Airbus A319 at London Heathrow (LHR) appears to point to inadequate ground maintenance and pre-flight checking. In a special bulletin issued on May 31, the AAIB confirmed that the fan cowl doors on both engines had been left unlatched after maintenance. Just after liftoff, both engine cowlings separated from the aircraft, causing damage that eventually led to one engine fire and shutdown. The aircraft returned to LHR on one engine and landed there safely. No one was injured during the incident.