Summary
This document proposes to supersede Airworthiness Directive (AD) 75-26-15, which currently requires repetitively inspecting the aileron mass balance clamp unit attachment for looseness on Pilatus Britten-Norman Ltd. (Pilatus Britten-Norman) BN-2A and BN2A MK. 111 series airplanes, and modifying the aileron and mass balance clamp unit if any looseness is found. The Federal Aviation Administration's policy on aging commuter-class aircraft is to eliminate or, in certain instances, reduce the number of certain repetitive short-interval inspections when improved parts or modifications are available. The proposed action would retain the repetitive inspections required by AD 75-26-15, and would require modifying the aileron and mass balance unit (at a certain time) as terminating action for the repetitive inspections. The actions specified in the proposed AD are intended to prevent failure of the aileron mass balance attachment, which could result in loss of control of the airplane.