§ Mr. Gerald Howarth
To ask the Secretary of State for the Environment, Transport and the Regions in what circumstances the Air Accidents Investigation Board investigates military accidents. 
§ Mr. Mullin
The AAIB provides assistance to military Boards of Inquiry convened to investigate the circumstances of aircraft accidents under the provisions of a Memorandum of Understanding that deals with mutual assistance between the AAIB and the Royal Air Force. The formal position of the AAIB Inspector is that of an adviser to the President of the Board of Inquiry. The role usually extends to providing assistance with the detailed examination of wreckage and the replay and analysis of any flight recorders fitted to the aircraft.
The Royal Air Force provides guidance to Presidents of Board of Inquiry about the circumstances in which it would be appropriate to seek the AAIB' s assistance. These circumstances include accidents involving structural failure, fire in the air and any other circumstances where the immediate causes of the accident are unclear.