Airworthiness Directive · Amendment 39-11667 · Boeing Model 757-200 and -200PF Series Airplanes
Boeing Model 757-200 and -200PF Series Airplanes
Model 757-200 and -200PF series airplanes, line numbers 1 through 806 inclusive; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (e) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757-200 and -200PF series airplanes, that requires repetitive detailed visual inspections to detect loose fuse pins in the outboard beam attachment and forward trunnion support on the main landing gear (MLG) and to detect corrosion on the structure adjacent to the fuse pin; and corrective actions, if necessary. This amendment also requires eventual replacement of the fuse pins with new corrosion resistant steel (CRES) fuse pins, which constitutes terminating action for the repetitive inspections. This amendment is prompted by a report of damaged fuse pins caused by corrosion. The actions specified by this AD are intended to prevent corroded fuse pins, which could result in the MLG separating from the wing, and consequent damage to the airplane and possible rupture of the wing fuel tank.
To prevent corroded fuse pins, which could result in the main landing gear (MLG) separating from the wing, and consequent damage to the airplane and possible rupture of the wing fuel tank, accomplish the following:
(a) Perform a detailed visual inspection to detect loose fuse pins in the outboard beam attachment and forward trunnion support on the MLG and to detect corrosion on the structure adjacent to the fuse pin, in accordance with Boeing Alert Service Bulletin 757-57A0054, including Appendix A, dated November 5, 1998, or Boeing Service Bulletin 757-57A0054, Revision 1, including Appendix A, dated December 16, 1999; at the later of the times specified in paragraphs (a)(1) and (a)(2) of this AD. Thereafter, repeat the inspection at intervals not to exceed 3,000 flight cycles or 24 months, whichever occurs first, until accomplishment of paragraph (d) of this AD.
(1) Prior to 4 years since date of manufacture of the airplane; or
(2) Within 3,000 flight cycles or 24 months after the effective date of this AD, whichever occurs first.
Note 2: For the purposes of this AD, a detailed visual inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”
(b) For airplanes on which the alloy steel fuse pins were replaced prior to the effective date of this AD: Perform the initial inspection required by paragraph (a) of this AD within 4 years or 6,000 flight cycles after installation of the pins, whichever occurs later. Thereafter, accomplish the repetitive inspections required by paragraph (a) of this AD at the time specified in that paragraph.
(c) If any loose fuse pin or corrosion on the structure adjacent to the fuse pin is detected during any inspection required by paragraph (a) of this AD, prior to further flight, perform the applicable corrective action [i.e., detailed visual inspections for cracks or corrosion, repair of discrepant parts, and replacement of fuse pin] in accordance with Boeing Alert Service Bulletin 757-57A0054, including Appendix A, dated November 5, 1998, or Boeing Service Bulletin 757-57A0054, Revision 1, including Appendix A, dated December 16, 1999. Replacement of an alloy steel fuse pin with a new corrosion resistant steel (CRES) fuse pin constitutes terminating action for the repetitive inspection requirements of paragraph (a) of this AD for that fuse pin only.
(d) At the next scheduled MLG overhaul, or within 12 years after the effective date of this AD, whichever occurs first, replace all alloy steel fuse pins with new CRES fuse pins in the outboard beam attachment and forward trunnion support on the MLG in accordance with Boeing Alert Service Bulletin 757-57A0054, including Appendix A, dated November 5, 1998, or Boeing Service Bulletin 757-57A0054, Revision 1, including Appendix A, dated December 16, 1999. Accomplishment of the action specified in this paragraph constitutes terminating action for the repetitive inspection requirements 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
