Airworthiness directives › 2019-14-01
AD 2019-14-01 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG TAY 650-15 and TAY 651-54 Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) TAY 650-15 and TAY 651-54 turbofan engines with low-pressure compressor (LPC) fan blade module M01300AA or M01300AB, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 30 days after the effective date of this AD, determine whether the engine is a Group 1 or Group 2 engine as follows: (i) A Group 1 engine is an affected RRD TAY 650-15 or TAY 651-54 turbofan engine with a LPC fan blade, part number (P/N) JR31911, P/N JR33865, or P/N JR33866, and with a serial number (S/N) listed in Appendix 1 of RRD Alert Non-Modification Service Bulletin (NMSB) TAY-72-A1833, Revision 1, dated January 8, 2018. (ii) A Group 2 engine is any other RRD TAY 650-15 or TAY 651-54 turbofan engine with LPC fan blade module M01300AA or M01300AB, installed. (2) For Group 1 and 2 engines: Within 30 days after the effective date of this AD, determine the number of DFL treatments on each affected LPC fan blade by reviewing the maintenance records or using the alternative method specified in the Accomplishment Instructions, paragraph 3.D. or 3.Q., of RRD Alert NMSB TAY-72-A1833, Revision 1, dated January 8, 2018. (3) Depending on the results of the maintenance record review or the alternative method specified above, do the following, as applicable: (i) For Group 1 and 2 engines: If the number of DFL treatments on an LPC fan blade is fewer than 13, mark the LPC fan blade dovetail root with a suffix code during the next scheduled LPC fan blade removal using the Accomplishment Instructions, paragraph 3.J. or 3.U., of RRD Alert NMSB TAY-72-A1833, Revision 1, dated January 8, 2018. (ii) For Group 1 engines: If any LPC fan blades with 13 to 20 DFL treatments are installed on more than one engine on the same airplane, within 500 flight hours after the effective date of this AD, use one of the three options in the Accomplishment Instructions, paragraph 3.F., of RRD Alert NMSB TAY-72-A1833, Revision 1, dated January 8, 2018, to ensure that no LPC fan blade with 13 to 20 DFL treatments is installed on more than one engine on the same airplane. (iii) For Group 1 and 2 engines: If it is determined that the number of DFL treatments on an LPC fan blade is equal to or more than the value defined in Table 1 of paragraph (g) of this AD, remove the LPC fan blade from service and replace with a part eligible for installation within the compliance times specified in Table 1 of paragraph (g) of this AD. ER22JY19.004
Unsafe condition
This AD was prompted by reports of LPC fan blade retention lug fractures on engines with a high number of dry-film lubrication (DFL) treatments. The FAA is issuing this AD to prevent failure of the LPC fan blade retention lug. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane.
Affected ADs
None.
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