Airworthiness Directive · Amendment 39-16619 · Flight controls
BAE Systems (Operations) Limited Model ATP Airplanes; BAE Systems (Operations) Limited Model HS 748 Airplanes
This AD applies to all BAE Systems (Operations) Limited Model ATP airplanes and BAE Systems (Operations) Limited Model HS 748 series 2A and series 2B airplanes; certificated in any category.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: * * * * * Recently, during a walk round check, an operator found an aileron trim tab hinge pin that had migrated sufficiently to cause a rubbing foul on the flap. Other reports indicate that, for the purposes of expediency, it has become common practice during maintenance when replacing a control tab, instead of unbolting the forward part of the piano hinge from the primary control surface, the hinge pins are punched out of the hinges. Investigations have concluded that, after reinserting the pins after maintenance, the ends of the hinges may not have been pinched, which is likely to have been the cause of the detected hinge pin migration. This condition [non-pinched hinge pin ends], if not detected and corrected, could lead to further incidents of migration of a tab hinge pin out of the hinge, likely resulting in restricted movement of the tab control and consequent reduced control of the aeroplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 90 days after the effective date of this AD: Do a detailed inspection of the aileron and rudder tab piano hinge pins to determine that each piano hinge pin is 0.120 inch (3.00 mm) shorter than the piano hinge at each end; and that the piano hinge ends have been pinched sufficiently to prevent the piano hinge migrating from the piano hinge, in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-27-090, dated April 14, 2009; or BAE Systems (Operations) Limited Service Bulletin HS748-27-136, dated April 14, 2009, as applicable.
(1) If any piano hinge pin is not 0.120 inch (3.00 mm) shorter than the piano hinge at each end, before further flight, cut to size, in accordance with Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-27-090, dated April 14, 2009; or BAE Systems (Operations) Limited Service Bulletin HS748-27-136, dated April 14, 2009; as applicable.
(2) If any piano hinge pin is not pinched sufficiently to prevent the piano hinge migrating from the piano hinge, before further flight, pinch the hinge, in accordance with Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-27-090, dated April 14, 2009; or BAE Systems (Operations) Limited Service Bulletin HS748-27-136, dated April 14, 2009; as applicable.
Note 1: This AD differs from the MCAI and/or service information as follows: No differences
