No crashed aircraft or wreckage shall be moved until clearance has been received from the Accident Investigation Authority unless it constitutes an obstruction to the public or to air navigation or to other transport. These exceptions must be considered conservatively and the general rule about not moving wreckage should apply unless a definite hazard exists. The alternative of diverting aircraft is acceptable. As stated in 13,5,1,3, operations-can often be continued with reduced distances.