(1) Where a military aircraft is involved in an accident arising out of or in the course of air navigation and occurring in or over the United Kingdom or, if the aircraft belongs to Her Majesty, occurring anywhere, and the Minister and any one or more of the following authorities, that is to say, the Admiralty, a Secretary of State or the Minister of Supply, are of the opinion that—
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(a) the accident is or may be the result of a collision between that aircraft and a civil aircraft, or
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(b) the accident occurred or may have occurred while the aircraft was on, or in the course of taking off from or landing on, an aerodrome used wholly or mainly for the purposes of civil aviation, or
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(c) the accident has or may have otherwise occurred in such circumstances that the Minister is or may be concerned or interested in its circumstances or causes,