Summary
We propose to supersede Airworthiness Directive (AD) 2006-22- 08, which applies to all Air Tractor, Inc. (Air Tractor) Models AT-602, AT-802, and AT-802A airplanes. AD 2006-22-08 currently requires you to repetitively inspect the engine mount for any cracks, repair or replace any cracked engine mount, and report any cracks found to the FAA. Since we issued AD 2006-22-08, the FAA has received reports of two Model AT- 802A airplanes with cracked engine mounts (at 2,815 hours time-in- service (TIS) and 1,900 hours TIS) below the initial compliance time in AD 2006-22-08. The FAA has determined that an initial inspection at 1,300 hours TIS is required instead of 4,000 hours TIS required by AD 2006-22-08. Consequently, this proposed AD would retain the actions of AD 2006-22-08 while requiring the initial inspection at 1,300 hours TIS. We are proposing this AD to detect and correct cracks in the engine mount, which could result in failure of the engine mount. Such failure could leadto separation of the engine from the airplane.