Airworthiness Directives; Pilatus Britten-Norman Ltd. BN-2, BN-2A, BN-2B, BN-2T, BN-2T-4, and BN2A MK. III Series Airplanes

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This document proposes to adopt a new airworthiness directive (AD) that would apply to all Pilatus Britten-Norman Ltd. (Pilatus Britten-Norman) BN-2, BN-2A, BN-2B, BN-2T, BN-2T-4, and BN2A MK. III series airplanes. This proposed AD would require you to repetitively inspect the throttle friction-shaft; and replace the shaft if damaged. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this proposed AD are intended to detect and correct loosening of the throttle friction adjustment beyond its normal limits. Such a condition could lead to damage to the throttle friction-adjuster or the retaining washer and split pin. This could allow the throttle quadrant shaft to laterally shift and impede the operation of the engine controls.