AD 2019-20-05

(a) Effective Date

    This AD is effective October 30, 2019.

 (b) Affected ADs

    This AD replaces AD 2018-15-01, Amendment 39-19333 (83 FR 34755, 
July 23, 2018).

 (c) Applicability

    This AD applies to Rolls-Royce Deutschland Ltd. & Co KG (Type 
Certificate previously held by Rolls-Royce plc) (RRD) Trent 1000-A, 
Trent 1000-A2, Trent 1000-AE, Trent 1000-AE2, Trent 1000-AE3, Trent 
1000-C, Trent 1000-C2, Trent 1000-CE, Trent 1000-CE2, Trent 1000-
CE3, Trent 1000-D, Trent 1000-D2, Trent 1000-D3, Trent 1000-E, Trent 
1000-E2, Trent 1000-G, Trent 1000-G2, Trent 1000-G3, Trent 1000-H, 
Trent 1000-H2, Trent 1000-H3, Trent 1000-J2, Trent 1000-J3, Trent 
1000-K2, Trent 1000-K3, Trent 1000-L2, Trent 1000-L3, Trent 1000-M3, 
Trent 1000-N3, Trent 1000-P3, Trent 1000-Q3 and Trent 1000-R3 model 
turbofan engines, with an engine serial number (ESN) listed in 
Appendix 1, 2, or 3 of Rolls-Royce plc (RR) Alert Non-Modification 
Service Bulletin (NMSB) Trent 1000 72-AK186, Revision 2, dated April 
16, 2019, except those engines that have incorporated the 
modifications in RR Service Bulletin (SB) Trent 1000 72-H818, dated 
November 14, 2016, or RR SB Trent 1000 72-J559, dated November 27, 
2017.

 (d) Subject

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

 (e) Unsafe Condition

    This AD was prompted by the determination that certain 
intermediate-pressure turbine (IPT) blades are susceptible to shank 
corrosion which leads to cracking and possible blade separation. The 
FAA is issuing this AD to prevent the simultaneous failure of both 
engines installed on an airplane, during flight. The 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

    (1) For engines with an ESN listed in Appendix 1 of RR Alert 
NMSB Trent 1000 72-AK186, Revision 2, dated April 16, 2019 (``RR 
Alert NMSB Trent 1000 72-AK186''), prior to reaching the blade cycle 
life limit listed in Appendix 1 of RR Alert NMSB Trent 1000 72-
AK186, or within 30 days of the effective date of this AD, whichever 
occurs later, remove the IPT blade set and replace with an IPT blade 
set eligible for installation.
    (2) For engines with an ESN listed in Appendix 2 of RR Alert 
NMSB Trent 1000 72-AK186:
    (i) If the engine is in an engine shop visit on the effective 
date of this AD, remove the IPT blade set and replace with an IPT 
blade set eligible for installation prior to returning the engine to 
service; or

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    (ii) If the engine is not in an engine shop visit on the 
effective date of this AD and the IPT blade set was not replaced 
during the previous engine shop visit, remove the IPT blade set and 
replace with an IPT blade set eligible for installation within 30 
days of the effective date of this AD.
    (3) For engines that have replaced the IPT blade set per RR NMSB 
Trent 1000 72-J442, Revision 3, dated October 8, 2018, or RR NMSB 
Trent 1000 72-J465, Revision 4, dated October 8, 2018, as 
applicable, remove and replace those blades prior to reaching the 
``Permitted Cycles of operation since installation in accordance 
with NMSB 72-J442 or 72-J465'' listed in Appendix 3 of RR Alert NMSB 
Trent 1000 72-AK186, as applicable for each ESN, or within 30 days 
of the effective date of this AD, whichever occurs later.

    Note 1 to paragraph (g): An IPT blade set eligible for 
installation is a full set of new IPT blades, or a full set of 
blades that have been inspected per RR NMSB Trent 1000 72-J442, 
Revision 3, dated October 8, 2018, or RR NMSB Trent 1000 72-J465 
Revision 4, October 8, 2018, as applicable by engine model.

 (h) Definition

    For the purpose of this AD, an ``engine shop visit'' is the 
induction of an engine into the shop for maintenance involving the 
separation of pairs of major mating engine case flanges, except that 
the separation of engine flanges solely for the purposes of 
transportation without subsequent engine maintenance does not 
constitute an engine shop visit.

 (i) 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 (j)(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.

 (j) Related Information

    (1) For more information about this AD, contact Martin Adler, 
Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: 781-238-7088; fax: 781-238-7157; email: 
[email protected].
    (2) Refer to European Union Aviation Safety Agency (EASA) AD 
2019-0135, dated June 11, 2019, 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-2019-0693.

 (k) 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 
Trent 1000 72-AK186, Revision 2, dated April 16, 2019.
    (ii) [Reserved]
    (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 at the National 
Archives and Records Administration (NARA). For information on the 
availability of this material at NARA, email: [email protected], 
or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.