Airworthiness directives › 2014-09-07
AD 2014-09-07 Airworthiness Directives; The Boeing Company Airplanes
Models named: 757-200, -200PF, -200CB, -300 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
(1) This AD applies to The Boeing Company Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category, equipped with Rolls-Royce RB211-535E4, -535E4-B, and -535E4-C engines; or with Rolls-Royce RB211-535E4, -535E4-B, and -535E4-C engines that have air intake cowls that were modified by Bombardier Aerospace Supplemental Type Certificate (STC) ST02102NY ( http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/256325188c3b1f2f8625705f004dd977/$FILE/ST02102NY.pdf ), commonly known as 535E4X cowls. (2) Installation of supplemental type certificate (STC) ST01518SE ( http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/48e13cdfbbc32cf4862576a4005d308b/$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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes on which the air intake cowls were replaced before the effective date of this AD using a kit or parts identified in paragraph (g)(1), (g)(2), or (g)(3) of this AD: Within 144 months since replacement of the air intake cowl, or according to the applicable time specified in paragraphs (h)(1) through (h)(l2) of this AD, whichever is later, replace the air intake cowl with a cowl which has had the forward bulkhead assembly, TAI spray ring assembly, and associated attachment fittings of the air intake cowl replaced using a kit or new parts, in accordance with the Accomplishment Instructions of Bombardier Alert Non-Modification Service Bulletin RB211-E4-A1003, Revision 3, dated February 4, 2014 (for engines with air intake cowls modified by Bombardier Aerospace STC ST02102NY ( http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/256325188c3b1f2f8625705f004dd977/$FILE/ST02102NY.pdf, commonly known as a 535E4X cowls); or Rolls-Royce Alert Non-Modification Service Bulletin RB.211-71-AG698, excluding Appendix 1 and including Appendices 2, 3, and 4, Revision 2, dated June 20, 2013 (for engines having Dyna-Rohr or Bombardier standard air intake cowls). Repeat the replacement thereafter at intervals not to exceed 144 months. (1) RB211-E4A1003KIT, or all the parts listed in Appendix 3 of Bombardier Alert Non-Modification Service Bulletin RB211-E4-A1003, Revision 3, dated February 4, 2014 (for engines with air intake cowls modified by Bombardier Aerospace STC ST02102NY ( http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/256325188c3b1f2f8625705f004dd977/$FILE/ST02102NY.pdf, commonly known as a 535E4X cowls). (2) RB211-71-AG698-E4KIT, or all the parts listed in Appendix 3 of Rolls-Royce Alert Non-Modification Service Bulletin RB.211-71-AG698, Revision 2, dated June 20, 2013 (for engines with Dyna-Rohr standard air intake cowls). (3) RB211-71-AG698-E4BKIT, or all the parts listed in Appendix 4 of Rolls-Royce Alert Non-Modification Service Bulletin RB.211-71-AG698, Revision 2, dated June 20, 2013 (for engines with Bombardier standard air intake cowls).
Unsafe condition
This AD was prompted by reports of cracking of the forward bulkhead web, web stiffeners, attachment angles, and thermal anti-ice (TAI) spray ring assemblies of the engine air intake cowl. We are issuing this AD to prevent the failure of air intake cowl components due to cracking, which could result in the air intake cowl separating from the engine and striking critical airplane control surfaces that could result in a loss of airplane control; severe engine damage, and loss of thrust; or large parts striking a person or property on the ground.
Affected ADs
None.
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