AD FAA-2010-0827

This document incorporates the FRFA for Airworthiness Directive (AD) 2010-17-18, which applied to these products: Air Tractor, Inc. (Air Tractor) Models AT-802 and AT-802A airplanes. We have since revised AD 2010-17-18, which requires you to repetitively inspect (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 and repair or replace any cracked spar, and changes the safe life for certain serial number (SN) ranges. Our initial analysis indicated that a FRFA was necessary for AD 2010-17-18. We issued AD 2010-17-18 without the FRFA to immediately address the unsafe condition. This action presents the FRFA for AD 2010-17-18, which is required to be published in the Federal Register.