AD 97-11-11 62 FR 29001

This amendment adopts a new airworthiness directive (AD) that applies to Aerospace Technologies of Australia Pty Ltd. (ASTA) Models N22B, N22S, and N24A airplanes. This action requires repetitively inspecting the horizontal stabilizer upper and lower skin, intercostal angles, and the horizontal stabilizer trailing edge channel for cracks; and repairing any crack or replacing any cracked parts, as applicable. This AD results from numerous reports of cracking in these horizontal stabilizer areas on the affected airplanes. The actions specified by this AD are intended to prevent structural failure of the horizontal stabilizer caused by fatigue cracks, which could result in loss of control of the airplane.