AD 97-22-02 62 FR 55500

This amendment adopts a new airworthiness directive (AD) that applies to Pilatus Britten-Norman Ltd. (PBN) BN-2, BN-2A, BN-2B, and BN-2T series airplanes. This action requires modifying the upper engine mounting brackets on the wing front spar as terminating action for the repetitive inspections that were required in AD 84-23-06. AD 84-23-06 is being revised in a separate action, deleting the Pilatus BN-2, BN- 2A, BN-2B, and BN-2T series airplanes from its applicability. This AD is prompted by several reports of cracks in the upper engine mounting brackets and a new terminating action to eliminate the repetitive inspections for Pilatus BN-2, BN-2A, BN-2B, and BN-2T series airplanes. The actions specified by this AD are intended to prevent the failure of the upper engine mounting brackets on the wing mounted engines, which could possibly cause structural failure of the airplane.