Airworthiness Directive · Amendment 39-17455 · Nacelles/pylons
The Boeing Company Airplanes
(1) This AD applies to The Boeing Company Model 757-200 and -200PF series airplanes, certificated in any category, line numbers 1 through 735 inclusive, powered by Pratt & Whitney engines.
(2) Supplemental Type Certificate (STC) ST01518SE (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/48e13cdfbbc32cf4862576a4005d308b/$FILE/ST01518SE.pdf) does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST01518SE is installed, a “change in product” alternative method of compliance (AMOC) approval request is not necessary to comply with the requirements of 14 CFR 39.17. For all other AMOC requests, the operator must request approval for an AMOC in accordance with the provisions of paragraph (k) of this AD.
We are superseding an existing airworthiness directive (AD) for certain The Boeing Company Model 757-200 and -200PF series airplanes. That AD currently requires modifying the nacelle strut and wing structure, and repairing any damage found during the modification. This new AD specifies a maximum compliance time limit that overrides the optional threshold formula results. This AD was prompted by reports indicating that the actual operational loads applied to the nacelle are higher than the analytical loads that were used during the initial design. Subsequent analysis and service history, which includes numerous reports of fatigue cracking on certain strut and wing structure, indicated that fatigue cracking can occur on the primary strut structure before an airplane reaches its design service objective. We are issuing this AD to prevent fatigue cracking in primary strut structure and consequent reduced structural integrity of the strut.
This paragraph restates the requirements of paragraph (a) of AD 2003-18-05, Amendment 39-13296 (68 FR 53496, September 11, 2003), with new service information and a reduced compliance time. Modify the nacelle strut and wing structure on both the left and right sides of the airplane, in accordance with Boeing Service Bulletin 757-54-0034, dated May 14, 1998; Boeing Service Bulletin 757-54-0034, Revision 1, dated October 11, 2001; or Boeing Service Bulletin 757-54-0034, Revision 2, dated May 7, 2009; at the later of the times specified in paragraph (g)(1) or (g)(2) of this AD. As of the effective date of this AD, only Boeing Service Bulletin 757-54-0034, Revision 2, dated May 7, 2009, may be used to accomplish the actions required by this paragraph.
(1) At the earlier of the times specified in paragraphs (g)(1)(i) and (g)(1)(ii) of this AD.
(i) Prior to the accumulation of 37,500 total flight cycles.
(ii) At the later of the times specified in paragraph (g)(1)(ii)(A) or (g)(1)(ii)(B) of this AD.
(A) Within 20 years since the date of manufacture.
(B) Within the compliance time calculated using the optional threshold formula described in Boeing Service Bulletin 757-54-0034, Revision 2, dated May 7, 2009, or within 8 years after the effective date of this AD, whichever occurs first.
(2) Within 3,000 flight cycles after November 13, 2000 (the effective date of AD 2000-20-09, Amendment 39-11920 (65 FR 59703, October 6, 2000)).
This paragraph restates the requirements of paragraph (b) of AD 2003-18-05, Amendment 39-13296 (68 FR 53496, September 11, 2003), with new service information. Except as provided by paragraph (j) of this AD: Prior to or concurrently with the accomplishment of the modification of the nacelle strut and wing structure required by paragraph (g) of this AD, accomplish the actions specified in Boeing Service Bulletin 757-54-0027, Revision 1, dated October 27, 1994; and Boeing Service Bulletin 757-54-0036, dated May 14, 1998, or Boeing Service Bulletin 757-54-0036, Revision 1, dated July 31, 2006; as applicable; in accordance with those service bulletins. As of the effective date of this AD, use only Boeing Service Bulletin 757-54-0027, Revision 1, dated October 27, 1994; and Boeing Service Bulletin 757-54-0036, Revision 1, dated July 31, 2006; to accomplish the applicable requirements of this paragraph.
This paragraph restates the requirements of paragraph (c) of AD 2003-18-05, Amendment 39-13296 (68 FR 53496, September 11, 2003), with new service information. If any damage to airplane structure is found during the accomplishment of the modification required by paragraph (g) of this AD, and Boeing Service Bulletin 757-54-0034, dated May 14, 1998; Boeing Service Bulletin 757-54-0034, Revision 1, dated October 11, 2001; or Boeing Service Bulletin 757-54-0034, Revision 2, dated May 7, 2009; specifies to contact Boeing for appropriate action: Before further flight, repair the damage using a method approved in accordance with the procedures specified in paragraph (k) of this AD.
This paragraph restates the requirements of paragraph (d) of AD 2003-18-05, Amendment 39-13296 (68 FR 53496, September 11, 2003), with new service information. Modify the nacelle strut (including replacing the upper link with a new, improved part, and modifying the wire support bracket attached to the upper link), in accordance with Boeing Service Bulletin 757-54-0036, dated May 14, 1998; or Boeing Service Bulletin 757-54-0036, Revision 1, dated July 31, 2006; at the earlier of the times specified in paragraphs (j)(1) and (j)(2) of this AD. As of the effective date of this AD, use only Boeing Service Bulletin 757-54-0036, Revision 1, dated July 31, 2006, to accomplish the requirements of this paragraph.
(1) Prior to or concurrently with accomplishment of the modification of the nacelle strut and wing structure required by paragraph (g) of this AD.
(2) Prior to the accumulation of 27,000 total flight cycles (for Model 757-200 series airplanes) or 29,000 total flight cycles (for Model 757-200PF series airplanes), or within 2 years after October 16, 2003 (the effective date of AD 2003-18-05, Amendment 39-13296 (68 FR 53496, September 11, 2003)), whichever is later.
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
