Airworthiness Directives; Pilatus Britten-Norman BN2A, BN2B, and BN2T Islander Series and BN2A Mk III Trislander Series Airplanes

Résumé

This document proposes to adopt a new airworthiness directive (AD) that would apply to Pilatus Britten-Norman BN2A, BN2B, and BN2T Islander and BN2A Mk III Trislander series airplanes that are equipped with a nose wheel steering disconnect system with either a Modification NB/M/503 or Modification NB/M/733 nose undercarriage unit. The proposed action would require repetitively inspecting the nose wheel steering drive ring for cracks, and replacing any cracked drive ring. A report of the rudder pedals jamming in the central position during a takeoff on one of the affected airplanes prompted the proposed action. The actions specified by the proposed AD are intended to prevent failure of the nose wheel steering system because of a cracked drive ring, which could result in the inability to move the rudder pedals.