Airworthiness Directive · Amendment 39-11618 · Boeing Model 757-200, -200PF, and -200CB Series Airplanes Powered by Rolls-Royce RB211-535C/E4/E4B Turbofan Engines
Boeing Model 757-200, -200PF, and -200CB Series Airplanes Powered by Rolls-Royce RB211-535C/E4/E4B Turbofan Engines
Model 757-200, -200PF, and -200CB series airplanes powered by Rolls-Royce RB211-535C/E4/E4B turbofan engines, 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 (f) 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 supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 757-200, -200PF, and -200CB series airplanes, that currently requires repetitive inspections of the engine thrust control cable system to detect discrepancies of the wire rope, fittings, and pulleys; and replacement, if necessary. That AD also requires a one-time inspection to determine the part number of certain pulleys, and replacement of existing pulleys with new pulleys, if necessary; and modification of the engine thrust control cable installation. This new action corrects a certain part number. This AD is prompted by reports of failure of certain engine thrust control cables. The actions specified by this AD are intended to prevent failure of certain engine thrust control cables, which could result in a severe asymmetric thrust condition during landing, and consequent reduced controllability of the airplane.
To prevent engine thrust control cable failure, which could result in a severe asymmetric thrust condition during landing, and consequent reduced controllability of the airplane, accomplish the following:
(a) Within 24 months or 6,000 flight hours after February 7, 2000 (the effective date of AD 99-27-06, amendment 39-11487), whichever occurs first: Accomplish the “Thrust Control Cable Inspection Procedure” specified in Appendix 1. (including Figure 1) of this AD to verify the integrity of the thrust control cables. Prior to further flight, repair any discrepancy found in accordance with the procedures described in the Boeing 757 Maintenance Manual. Repeat the inspection thereafter at intervals not to exceed 24 months or 6,000 flight hours, whichever occurs first.
(b) For airplanes having line numbers 1 through 636 inclusive: Within 24 months or 6,000 flight hours after February 7, 2000, whichever occurs first, perform a one-time inspection of the 8 engine thrust control cable pulleys in the struts (4 in each strut) to determine the part number (P/N) of each pulley. If any pulley having P/N 65B80977-1 or BACP30M4 is installed, prior to further flight, replace it with a pulley having P/N 255T1232-7, in accordance with the procedures described in the Boeing 757 Airplane Maintenance Manual.
Note 2: The location of the pulleys to be inspected in accordance with paragraph (b) of this AD is specified in Chapters 53-11-53-04, 76-11-52-01, and 76-11-52-02 of the Boeing 757 Illustrated Parts Catalog.
(c) For airplanes identified in Boeing Service Bulletin 757-76-1, dated May 18, 1984: Within 24 months or 6,000 flight hours after February 7, 2000, whichever occurs first, remove the guide bracket of the engine thrust control cable located on the front spar of the right wing, in accordance with the service bulletin.
(d) For airplanes identified in Boeing Service Bulletin 757-76-0005, dated May 5, 1988: Within 24 months or 6,000 flight hours after February 7, 2000, whichever occurs first, remove the engine thrust control cable breakaway stop assemblies, and replace sections of the engine thrust control cables with smaller diameter cables in accordance with the service bulletin.
(e) For airplanes identified in Boeing Service Bulletin 757-30A0018, Revision 2, dated September 9, 1999: Within 60 days after February 7, 2000, install a support bracket assembly between the window heat wire bundle and the engine thrust control cable; and adjust the wire bundle clearance, as necessary, to parallel the minimum clearance specified in Boeing Alert Service Bulletin 757-30A0018, Revision 1, dated September 17, 1998; or Boeing Service Bulletin 757-30A0018, Revision 2, dated September 9, 1999.
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
