Airworthiness Directive · Amendment 39-15857 · Boeing Model 757-200, 757-200PF, and 757-300 Series Airplanes
Boeing Model 757-200, 757-200PF, and 757-300 Series Airplanes
This AD applies to Boeing Model 757-200, 757-200PF, and 757-300 series airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin 757-28A0085, Revision 2, dated December 11, 2007.
Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance (AMOC) according to paragraph (m) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane.
We are adopting a new airworthiness directive (AD) for certain Boeing Model 757-200, 757-200PF, and 757-300 series airplanes. This AD requires, for certain airplanes, measuring the electrical bond resistance at certain stations and doing any applicable repair; installing support brackets for the hot short protector and new support clamps for the wire bundles; installing the equipment of the hot short protector; and modifying an existing wire bundle and installing a new wire bundle. This AD also requires, for certain other airplanes, measuring the electrical bond resistance at certain stations, measuring the electrical bonding resistance between the hot short protector and rear spar web, and doing any applicable repair. This AD also requires revising the Airworthiness Limitations section of the Instructions for Continued Airworthiness. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent the center fuel tank densitometer from overheating and becoming a potential ignition source inside the fuel tank, which, in combination with flammable fuel vapors, could result in a center fuel tank explosion and consequent loss of the airplane.
Comply with this AD within the compliance times specified, unless already done.
For Groups 1 through 3 airplanes, as identified in Boeing Alert Service Bulletin 757-28A0085, Revision 2, dated December 11, 2007 (“the service bulletin”): Within 60 months after the effective date of this AD, do the measurement, installations, modifications, replacement, and applicable repair by accomplishing all the applicable actions specified in the Accomplishment Instructions of the service bulletin. Do the applicable repair before further flight.
For Group 4 airplanes, as identified in Boeing Alert Service Bulletin 757-28A0085, Revision 2, dated December 11, 2007 (“the service bulletin”): Within 60 months after the effective date of this AD, do the measurements and applicable repair by accomplishing all the applicable actions specified in the Accomplishment Instructions of the service bulletin. Do the applicable repair before further flight.
Concurrently with accomplishing the actions required by paragraphs (f) and (g) of this AD, revise the AWLs section of the Instructions for Continued Airworthiness (ICA) by incorporating AWL No. 28-AWL-22 of Subsection G of Section 9, D622N001-9 Revision December 2008 of the Boeing 757 Maintenance Planning Data (MPD) Document.
(i) After accomplishing the action specified in paragraph (h) of this AD, no alternative CDCCLs may be used unless the CDCCLs are approved as an AMOC in accordance with the procedures specified in paragraph (k) of this AD.
Actions done before the effective date of this AD in accordance with Boeing Alert Service Bulletin 757-28A0085, Revision 1, dated April 16, 2007, are acceptable for compliance with the requirements of paragraphs (f) and (g) of this AD.
(k) Actions done before the effective date of this AD in accordance with AWL No. 28-AWL-22 of Subsection G of Section 9 D622N001-9, Revision January 2007, Revision November 2007, or Revision March 2008 of the Boeing 757 Maintenance Planning Data (MPD) Document, are acceptable for compliance with the requirements of paragraph (h) of this AD.
Incorporating AWL No. 28-AWL-22 into the AWLs section of the ICA in accordance with paragraph (g)(3) of AD 2008-10-11, amendment 39-15517, terminates the action specified in paragraph (h) 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
