Airworthiness directives › 2017-10-19
AD 2017-10-19 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) Trent 1000-A2, Trent 1000-C2, Trent 1000-D2, Trent 1000-E2, Trent 1000-G2, Trent 1000-H2, Trent 1000-J2, Trent 1000-K2, and Trent 1000-L2 turbofan engines with intermediate pressure compressor (IPC) rotor seal, part number (P/N) KH19098, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Perform an on-wing borescope inspection (BSI) of the IPC rotor seal using paragraph 3, Accomplishment Instructions, of RR Alert Non-Modification Service Bulletin (NMSB) Trent 1000 72-AJ467, Revision 1, dated February 13, 2017 as follows: (i) For engines with an IPC rotor seal with 300 flight cycles (FC) or more before August 2017, perform a BSI before August 2017. (ii) For engines with an IPC rotor seal with less than 300 FC before August 2017, perform a BSI before the IPC rotor seal accumulates 300 FC. (2) Depending on the findings of the inspection(s) required by paragraph (g)(1) of this AD, repeat the on-wing BSI at intervals not to exceed those specified in Figures 2 or 4 of RR Alert NMSB Trent 1000 72-AJ467, Revision 1, dated February 13, 2017. (3) An in-shop inspection in accordance with paragraph 3, Accomplishment Instructions, of RR NMSB Trent 1000 72-J353, Revision 1, dated November 24, 2016, may be substituted for an on-wing BSI as required by paragraphs (g)(1) and (2) of this AD, within the compliance times specified. (4) After the effective date of this AD, do not operate an aircraft, having two engines installed that are both subject to the 20 FC IPC rotor seal re-inspection interval specified in Figure 4 of RR Alert NMSB Trent 1000 72-AJ467, Revision 1, dated February 13, 2017. (5) If, during an on-wing inspection as required by paragraphs (g)(1) or (2) of this AD, or an in-shop inspection as specified in paragraph (g)(3) of this AD, any crack is found on the rear face of the affected IPC rotor seal that is at or beyond the reject limits specified in Figure 4 of RR Alert NMSB Trent 1000 72-AJ467, Revision 1, dated February 13, 2017, replace the IPC rotor seal with a part eligible for installation, before next flight. (6) Replacing the IPC rotor seal on an engine, as required by paragraph (g)(5) of this AD, is not terminating action for the inspections required by paragraphs (g)(1) and (2) of this AD for that engine. (7) No reports requested in any of the Alert NMSBs that are referenced in paragraphs (g)(1), (2), and (3) of this AD are required by this AD.
Unsafe condition
This AD was prompted by failure of the IPC rotor seal. We are issuing this AD to prevent failure of the IPC rotor seal, loss of engine thrust control, and reduced control of the airplane.
Affected ADs
None.
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