Summary
We propose to supersede Airworthiness Directive (AD) 2010-17- 18 R1, which applies to certain Air Tractor, Inc. Models AT-802 and AT- 802A airplanes. AD 2010-17-18 R1 currently requires repetitively inspecting (using the eddy current method) the two outboard fastener holes in both of the wing main spar lower caps at the center splice joint for cracks; repairing or replacing any cracked spar; changing the safe life for certain serial number ranges; and sending the inspection results, only if cracks are found, to the FAA. Since we issued AD 2010- 17-18 R1, we have determined that the safe life for the wing main spar lower caps should apply to all AT-802 and AT-802A airplanes regardless of configuration or operational use. This proposed AD would retain all actions of AD 2010-17-18 R1 and expand the applicability to include all serial numbers regardless of configuration or operational use. We are proposing this AD to correct the unsafe condition on these products.