Airworthiness Directive · Amendment 39-14303 · BAE Systems (Operations) Limited Model ATP Airplanes
BAE Systems (Operations) Limited Model ATP Airplanes
This AD applies to BAE Systems (Operations) Limited Model ATP airplanes, certificated in any category; on which modification 35256A (BAE Systems (Operations) Limited Service Bulletin ATP-54-10) has been accomplished.
The FAA is adopting a new airworthiness directive (AD) for certain BAE Systems (Operations) Limited Model ATP airplanes. This AD requires doing an inspection of each bolt attaching the aft isolators to both engine subframes and replacing bolts if necessary. This AD results from reports of failures of the bolts attaching the aft isolators to the engine subframe. We are issuing this AD to prevent failure of the bolts attaching the aft isolators to the engine subframe, which may result in an engine separating from the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
At the later of the times specified in paragraphs (f)(1) and (f)(2) of this AD: Do a detailed inspection for missing or failed bolts that attach aft isolator brackets to both engine subframes in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-54-20, dated July 29, 2003. Repeat the inspection thereafter at intervals not to exceed 2,000 flight cycles.
(1) Within 2,000 flight cycles after the last torque check of the bolts attaching the aft isolator brackets to both engine subframes done in accordance with BAE Systems (Operations) Limited Service Bulletin ATP-54-20.
(2) Within 300 flight cycles after the effective date of this AD.
Note 1: For the purposes of this AD, a detailed inspection is: “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
(g) If any bolt is missing or failed on any engine subframe during the inspection required by paragraph (f) of this AD: Before further flight, replace all bolts on that engine subframe in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-54-20, dated July 29, 2003. If any bolt holes on any engine subframe are not within the tolerance specified in the service bulletin: Before further flight, repair according to a method approved by either the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA; or the Civil Aviation Authority (CAA) (or its delegated agent).
As of the effective date of this AD, no person may install a quick engine change unit subframe on any airplane, unless the subframe has been inspected in accordance with paragraph (f) of this AD.
(i) Although the service bulletin referenced in this AD specifies to submit certain information to the manufacturer, this AD does not include that requirement.
