Airworthiness Directive · Amendment 39-14204 · Boeing Model 757-200, -200PF, and -200CB Series Airplanes Equipped With Pratt & Whitney or Rolls-Royce Engines
Boeing Model 757-200, -200PF, and -200CB Series Airplanes Equipped With Pratt & Whitney or Rolls-Royce Engines
This AD applies to Boeing Model 757-200, -200PF, and -200CB series airplanes, line numbers 1 through 735 inclusive, certificated in any category; equipped with Pratt & Whitney or Rolls-Royce engines.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 757-200, -200PF, and -200CB series airplanes. This AD requires inspecting to determine the part number of the upper link forward fuse pins of the engine struts and replacing the fuse pins as necessary. This AD is prompted by a report indicating that, due to an incorrect listing in the illustrated parts catalog, persons performing maintenance on the engine strut(s) could have installed an incorrect upper link forward fuse pin. We are issuing this AD to prevent a ruptured wing box, due to the engine not separating safely during certain emergency landing conditions, which could lead to a fuel spill and consequent fire.
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 24 months after the effective date of this AD, perform a detailed inspection to determine the P/N of the upper link forward fuse pins of the engine struts, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-54-0048, dated May 13, 2004, except as provided in paragraphs (g) and (h) 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.”
(1) If the fuse pin is P/N 311N5501-1 or P/N 311N5060-1, no further action is required for that fuse pin.
(2) If the fuse pin is P/N 311N5501-2, prior to further flight, replace the fuse pin with a new or serviceable fuse pin, P/N 311N5501-1, in accordance with the Accomplishment Instructions of the service bulletin.
(3) If the P/N of the fuse pin cannot be determined by inspection, use a tool such as an inside reading micrometer to determine the inside diameter (ID) of the fuse pin bore.
(i) If the ID of the fuse pin bore is greater than or equal to 0.850 inch, no further action is required for that fuse pin.
(ii) If the ID of the fuse pin bore is less than 0.850 inch, prior to further flight, replace the fuse pin as specified in paragraph (f)(2) of this AD.
(g) Where Boeing Special Attention Service Bulletin 757-54-0048, dated May 13, 2004, permits the use of an “approved equivalent procedure” for access and replacement of the fuse pin(s), this AD requires that access and replacement be done in accordance with the instructions of the aircraft maintenance manual (AMM) as specified in the service bulletin.
Instead of the inspections required by paragraph (f) of this AD, a review of the airplane maintenance records is acceptable if the P/N of the fuse pins can be positively determined from that review.
(i) As of the effective date of this AD, no person may install a fuse pin, P/N 311N5501-2, on any airplane identified in the applicability of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
