Airworthiness Directive · Amendment 39-18887 · Rolls-Royce plc Turbofan Engines
Rolls-Royce plc Turbofan Engines
This AD applies to all Rolls-Royce plc (RR) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines, if fitted with fuel tube, part number (P/N) FW53576, which was incorporated through RR production modification 73-F343 or which were modified in service in accordance with RR Service Bulletin (SB) RB.211-73-F343, Revision 4, dated May 26, 2011.
We are superseding airworthiness directive (AD) 2015-17-19 for all Rolls-Royce plc (RR) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. AD 2015-17-19 required inspection of the fan case low-pressure (LP) fuel tubes and associated clips and the fuel oil heat exchanger (FOHE) mounts and associated hardware. This AD requires an engine modification, which terminates the repetitive inspections. This AD was prompted by fractures on the LP fuel return tube at mid-span locations that were found with resulting fuel leaks. We are issuing this AD to correct the unsafe condition on these products.
(1) Within 800 flight hours (FH) after October 20, 2015 (the effective date of AD 2015-17-19), or prior to further flight, whichever occurs later, and thereafter at intervals not to exceed 800 FH, inspect the clip at the uppermost fan case LP fuel tube clip position, CP4881, and support bracket, P/N FW26692. Use Accomplishment Instructions, paragraph 3.A, of RR Alert Non-Modification Service Bulletin (NMSB) RB.211-73-AH837, Revision 1, dated November 6, 2015, or paragraph 3.A. or 3.B. of RR Alert NMSB RB.211-73-AH522, Revision 4, dated January 18, 2016, to do the inspection.
(i) If the clip at the uppermost clip position, CP4881, fails inspection, before further flight, replace the clip with a part eligible for installation and inspect the fan case LP fuel tube, P/N FW53576, for fretting, and clips for cracks or failure, according to Accomplishment Instructions, paragraph 3.A. of RR Alert NMSB RB.211-73-AH837, Revision 1, dated November 6, 2015, or paragraph 3.A. or 3.B. of RR Alert NMSB RB.211-73-AH522, Revision 4, dated January 18, 2016.
(ii) If the support bracket, P/N FW26692, fails inspection, before further flight, replace the bracket with a part eligible for installation and inspect the fan case LP fuel tube, P/N FW53576, and clips for cracks or failure, according to Accomplishment Instructions, paragraph 3.A. of RR Alert NMSB RB.211-73-AH837, Revision 1, dated November 6, 2015, or paragraph 3.A. or 3.B. of RR Alert NMSB RB.211-73-AH522, Revision 4, dated January 18, 2016.
(2) Within 4,000 FH since new or 800 FH after October 20, 2015 (the effective date of AD 2015-17-19), or prior to further flight, whichever occurs later, and thereafter at intervals not to exceed 4,000 FH, inspect the fan case LP fuel tube, P/N FW53576, and clips, and the fuel oil heat exchanger (FOHE) mounts and hardware, for damage, wear, or fretting. Use paragraph 3.A. or 3.B., Accomplishment Instructions, of RR Alert NMSB RB.211-73-AH522, Revision 4, dated January 18, 2016, to do the inspection.
(i) If the fan case LP fuel tube, P/N FW53576, fails inspection, before further flight, replace the fuel tube and clips with parts eligible for installation.
(ii) If any FOHE mount or hardware shows signs of damage, wear, or fretting, before further flight, replace the damaged part with a part eligible for installation.
(3) At each shop visit after the effective date of this AD, inspect the fan case LP fuel tubes, P/Ns FW26589, FW36335, FW26587, FW53577, and FW53576, and clips, and the FOHE mounts and hardware, for damage, wear, or fretting. Use paragraphs 3.B.(1) and 3.B.(2) of RR Alert NMSB RB.211-73-AH522, Revision 4, dated January 18, 2016, to do the inspection.
(i) If any fan case LP fuel tube fails inspection, before further flight, replace the fuel tube and clips with parts eligible for installation.
(ii) If any FOHE mount or hardware shows signs of damage, wear, or fretting, before further flight, replace the damaged part with a part eligible for installation.
(4) If you replace any fan case LP fuel tube, clip, FOHE mount, or hardware as a result of the inspections in paragraphs (e)(1), (2), or (3) of this AD, you must still continue to perform the repetitive inspections specified in paragraphs (e)(1), (2), and (3) of this AD, until you comply with paragraph (e)(6) of this AD.
(5) No reports requested in any of the Alert NMSBs that are referenced in paragraphs (e)(1), (2), and (3) of this AD are required by this AD.
(6) During the next shop visit after the effective date of this AD, modify the engine in accordance with the Accomplishment Instructions, paragraphs (B) and (C), Section 3, of RR Alert Service Bulletin (ASB) RB.211-73-AJ366, Initial Issue and Supplement, dated May 3, 2016.
(7) After the effective date of this AD, do not install an M07 module, unless it is modified in accordance with the Accomplishment Instructions, paragraphs (B) and (C), Section 3, of RR ASB RB.211-73-AJ366, Initial Issue and Supplement, dated May 3, 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.
