Airworthiness directives › 2017-02-01
AD 2017-02-01 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) Trent 1000-A, Trent 1000-C, Trent 1000-D, Trent 1000-E, Trent 1000-G, and Trent 1000-H turbofan engines with high-pressure turbine (HPT) blades, part number (P/N) FW63853, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done. (1) Perform an initial inspection of each HPT blade before exceeding the following, whichever occurs later: (i) 1,750 engine flight cycles (FCs) since new or 11,000 engine flight hours (FHs) since new, whichever occurs first; or (ii) 30 days after the effective date of this AD. (2) Thereafter, perform repetitive inspections of the HPT blades at intervals not to exceed 250 engine FCs or 1,125 engine FHs, whichever occurs first. (3) Use the Accomplishment Instructions, paragraph 3, of RR Non-Modification Service Bulletin (NMSB) Trent 1000 72-J039, Revision 3, dated October 14, 2016, to perform the inspections. (4) If any crack is found during any inspection, follow the applicable corrective action and reduced follow-on inspection interval as defined in the Accomplishment Instructions, paragraph 3.A.(3), of RR NMSB Trent 1000 72-J039, Revision 3, dated October 14, 2016.
Required actions
After the effective date of this AD, do not install an HPT blade, P/N FW63853, on any engine.
Unsafe condition
This AD was prompted by high engine vibration due to HPT blade deterioration resulting in operational disruptions. We are issuing this AD to prevent HPT blade failure, loss of engine thrust control, and reduced control of the airplane.
Affected ADs
None.
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