Any pilot, whether resident or nonresident, of a civil aircraft involved in an accident resulting in personal injury or substantial damage to the aircraft shall immediately notify the executive director or the state police. If the pilot or pilots are incapacitated, any person who caused or authorized the operation of such aircraft at the time of the accident shall be responsible for giving such notification. A written report shall be filed with the executive director within fourteen calendar days on a form prescribed by the executive director. If requested by the executive director, a written report may also be required for an aircraft accident when the damage is less than substantial. The executive director may make an investigation of such accidents as he or she deems advisable or in lieu of a detailed investigation may accept a copy of the final report by a federal investigation agency.