Airworthiness Directive · Amendment 39-18794 · Engine oil cooler
Rolls-Royce plc Turbofan Engines
This AD applies to Rolls-Royce plc (RR) RB211 Trent 553-61, RB211 Trent 553A2-61, RB211 Trent 556-61, RB211 Trent 556A2-61, RB211 Trent 556B-61, RB211 Trent 556B2-61, RB211 Trent 560-61, and RB211 Trent 560A2-61 turbofan engines that have any of the following fuel tube part numbers installed: FW57605, FW17689, FW57604, FK30710, FW57578, or FK30713.
We are superseding airworthiness directive (AD) 2013-05-18 for certain Rolls-Royce plc (RR) RB211 Trent 500 series turbofan engines. AD 2013-05-18 required initial and repetitive inspections of the low- pressure (LP) fuel tubes, fuel tube clips, and fuel/oil heat exchanger (FOHE) mounts for evidence of damage, wear, and fuel leakage. This AD reduces the repetitive inspection intervals. This AD was prompted by additional service experience. We are issuing this AD to correct the unsafe condition on these products.
(1) Inspect the LP fuel tubes, clips, and fuel/oil heat exchanger (FOHE) mounts of the LP fuel system of engines that are on wing within 1,600 flight hours after February 24, 2012, or before the next flight after the effective date of this AD, whichever occurs later. Use the Accomplishment Instructions, paragraph 3.A, of RR Alert Non-Modification Service Bulletin (NMSB) RB.211-73-AG948, Revision 3, dated September 9, 2016, to do the inspection.
(2) At intervals not to exceed 5,000 engine flight hours (EFH), reinspect the LP fuel tubes, clips, and FOHE mounts using the Accomplishment Instructions, paragraph 3.A or 3.B, of RR Alert NMSB RB.211-73-AG948, Revision 3, dated September 9, 2016.
(3) If the LP fuel system fails the inspections required by paragraphs (g)(1) and (2) of this AD, replace the part(s) that failed the inspection with hardware eligible for installation before further flight.
(4) At any shop visit after the effective date of this AD, inspect the LP fuel system using the Accomplishment Instructions, paragraph 3.B, of RR Alert NMSB RB.211-73-AG948, Revision 3, dated September 9, 2016.
(1) For the purpose of this AD, a shop visit is the induction of an engine into the shop for maintenance or overhaul. The separation of engine flanges solely for the purpose of transporting the engine without subsequent engine maintenance does not constitute an engine shop visit.
(2) For the purposes of paragraph (g)(2) of this AD, EFHs are those accumulated by the engine since the most recent accomplishment of any RR Service Bulletin (SB), NMSB, or Alert NMSB listed in paragraphs (h)(2)(i) through (h)(2)(v) of this AD:
(i) Accomplishment of RR SB RB.211-73-F737, Revision 5, dated June 9, 2009, or earlier versions.
(ii) Accomplishment of RR SB RB.211-73-F738, Revision 2, dated February 20, 2015, or earlier versions.
(iii) Last inspection in accordance with RR Alert NMSB RB.211-73-AG797, Revision 2, dated June 13, 2012.
(iv) Last inspection in accordance with RR NMSB RB.211-73-G723, Revision 1, dated January 31, 2012.
(v) Last inspection in accordance with RR Alert NMSB RB.211-73-AG948, Revision 3, dated September 9, 2016.
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.
