AD 2018-15-01

(a) Effective Date

    This AD is effective August 7, 2018.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Rolls-Royce plc (RR) Trent 1000-A, Trent 
1000-C, Trent 1000-D, Trent 1000-E, Trent 1000-G, Trent 1000-H, 
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 engine models with engine serial numbers identified in 
Appendix 1, Table 1, of RR Alert Non-Modification Service Bulletin 
(NMSB) TRENT 1000 72-AJ992, Revision 1, dated January 3, 2018, or 
Appendix 1, Table 1, of RR Alert NMSB TRENT 1000 72-AJ992, Revision 
2, dated April 16, 2018, except those that have incorporated RR 
Service Bulletin (SB) Trent 1000 72-H818, dated November 14, 2016.

(d) Subject

    Joint Aircraft System Component (JASC) 7250, Turbine Engine, 
Turbine Section.

(e) Unsafe Condition

    This AD was prompted by operating restrictions that have been 
defined for certain engines with intermediate-pressure turbine (IPT) 
blades susceptible to shank corrosion and possible blade separation. 
These restrictions define when an engine can no longer be installed 
on an airplane together with other engines susceptible to the same 
failure. We are issuing this AD to prevent the simultaneous failure 
of both engines. This unsafe condition, if not addressed, could 
result in a dual engine in-flight shutdown and loss of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Required Actions

    After the effective date of this AD, for any affected engine 
identified in Appendix 1, Table 1, of RR Alert NMSB TRENT 1000 72-
AJ992, Revision 1, dated January 3, 2018; or Appendix 1, Table 1, of 
RR Alert NMSB TRENT 1000 72-AJ992, Revision 2, dated April 16, 2018, 
installed with another affected engine, listed in the same table, on 
the same airplane, remove one of the engines from the airplane 
before both engines exceed their respective IPT blade cyclic life 
limit identified in Appendix 1, Table 1, of the respective NMSB, or 
within 20 flight cycles, whichever occurs later.

(h) Installation Prohibition

    (1) Engines listed in each group in Appendix 1, Table 1, of RR 
Alert NMSB Trent 1000 72-AJ992, Revision 1, dated January 3, 2018, 
or Appendix 1, Table 1, of Alert NMSB Trent 1000 72-AJ992, Revision 
2, dated April 16, 2018, are not to be installed on an airplane 
together with an engine listed in a different group in the same 
table once they have exceeded their IPT blade cyclic life limit 
identified in Appendix 1, Table 1 of the respective NMSB.

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    (2) Engines listed in Appendix 1, Table 1, of RR Alert NMSB 
Trent 1000 72-AJ992, Revision 1, dated January 3, 2018, or Appendix 
1, Table 1, of RR Alert NMSB Trent 1000 72-AJ992, Revision 2, dated 
April 16, 2018, may not be installed on an airplane with engines 
that have IPT blades installed in accordance with RR NMSB Trent 1000 
72-J442, Revision 1, dated February 21, 2018, or Initial Issue, 
dated September 21, 2016; or RR NMSB Trent 1000 72-J465, Revision 2, 
dated February 28, 2018, or Revision 1, dated January 10, 2017, or 
Initial Issue, dated December 22, 2016.

(i) Terminating Action

    Modification of an engine in accordance with the instructions of 
RR SB Trent 1000 72-H818, dated November 14, 2016, constitutes 
terminating action for the requirements of this AD for that engine.

(j) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, ECO Branch, FAA, has the authority to approve 
AMOCs for this AD, if requested using the procedures found in 14 CFR 
39.19. In accordance with 14 CFR 39.19, send your request to your 
principal inspector or local Flight Standards District Office, as 
appropriate. If sending information directly to the manager of the 
certification office, send it to the attention of the person 
identified in paragraph (k)(1) of this AD. You may email your 
request to: [email protected].
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.

(k) Related Information

    (1) For more information about this AD, contact Kevin M. Clark, 
Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: 781-238-7088; fax: 781-238-7199; email: 
[email protected].
    (2) Refer to European Aviation Safety Agency (EASA) AD 2018-
0086, dated April 17, 2018, for more information. You may examine 
the EASA AD in the AD docket on the internet at http://www.regulations.gov by searching for and locating it in Docket No. 
FAA-2017-1237.

(l) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless the AD specifies otherwise.
    (i) Rolls-Royce plc (RR) Alert Non-Modification Service Bulletin 
(NMSB) Trent 1000-72-AJ992, Revision 1, dated January 3, 2018.
    (ii) RR Alert NMSB Trent 1000-72-AJ992, Revision 2, dated April 
16, 2018.
    (iii) RR Service Bulletin Trent 1000 72-H818, dated November 14, 
2016.
    (3) For RR service information identified in this AD, contact 
Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, 
England, DE24 8BJ; phone: 011-44-1332-242424; fax: 011-44-1332-
249936; email: http://www.rolls-royce.com/contact/civil_team.jsp; 
internet: https://customers.rolls-royce.com/public/rollsroycecare.
    (4) You may view this service information at FAA, Engine and 
Propeller Standards Branch, 1200 District Avenue, Burlington, MA 
01803. For information on the availability of this material at the 
FAA, call 781-238-7759.
    (5) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.