Airworthiness Directive · Amendment 39-17640 · Wings
BAE Systems (Operations) Limited Airplanes
This AD applies to BAE Systems (Operations) Limited Model BAe 146-100A, -200A, and -300A airplanes; and Model Avro 146-RJ70A, 146-RJ85A, and 146-RJ100A airplanes; certificated in any category, all serial numbers.
We are adopting a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ series airplanes. This AD was prompted by a report of a cracked pick-up bracket of the forward outboard pylon of the number 1 engine due to stress corrosion. This AD requires repetitive inspections and, depending on findings, repair of the pylon pick-up brackets. We are issuing this AD to detect and correct cracking of the pick-up bracket, which could result in the engine pylon separating from the wing, with consequent damage to the airplane and reduced controllability.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
(1) Within the initial compliance time specified in paragraphs (g)(1)(i) and (g)(1)(ii) of this AD, as applicable, and thereafter at intervals not to exceed 24 months: Do a special detailed inspection with a videoscope of the flanges of the Rib 10 forward pylon pick-up bracket of each engine pylon for cracking, corrosion, and other defects, in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Inspection Service Bulletin ISB.57-073, Revision 1, dated January 27, 2012; or Revision 2, dated March 8, 2012.
(i) Within 6 months after the effective date of this AD, except as provided by paragraph (g)(1)(ii) of this AD.
(ii) For airplanes on which a maintenance records check positively determines that both forward pylon pick-up brackets have been replaced since first flight of the airplane: Within 20 months after the effective date of this AD.
(2) If, during any inspection required by paragraph (g)(1) of this AD, any cracking, corrosion or other defect of any Rib 10 forward pylon pick-up bracket is found: Before further flight, repair or replace the bracket as specified in paragraph (g)(2)(i) or (g)(2)(ii) of this AD.
(i) Repair a bracket in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Inspection Service Bulletin ISB.57-073, Revision 1, dated January 27, 2012; or Revision 2, dated March 8, 2012.
(ii) Replace a bracket using a method approved by either the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA; or the European Aviation Safety Agency (EASA) (or its delegated agent).
(3) Repairing or replacing a Rib 10 forward pylon pick-up bracket, as required by paragraph (g)(2) of this AD, does not terminate the repetitive inspections required by paragraph (g)(1) of this AD.
