AD 2018-25-01

(a) Effective Date

    This AD is effective December 21, 2018.

(b) Affected ADs

    This AD replaces AD 2018-13-07, Amendment 39-19319 (83 FR 34758, 
July 23, 2018).

(c) Applicability

    This AD applies to all Rolls Royce plc (RR) Trent 1000-A, Trent 
1000-C, Trent 1000-D, Trent 1000-E, Trent 1000-G, and Trent 1000-H 
turbofan engine models.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7230, Turbine Engine 
Compressor Section.

(e) Unsafe Condition

    This AD was prompted by reports of intermediate-pressure 
compressor (IPC) rotor blade cracks, which could lead to rotor blade 
separations resulting in engine failures. We are issuing this AD to 
prevent failure of the IPC. The unsafe condition, if not addressed, 
could result in failure of one or more engines, loss of thrust 
control, and loss of the airplane.

(f) Compliance

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

(g) Required Actions

    (1) Within 15 days of the effective date of this AD, or within 
the compliance times specified in Table 1 of RR Alert Non-
Modification Service Bulletin (NMSB) Trent 1000 72-AK130, Revision 
2, dated July 26, 2018, whichever occurs later, perform on-wing 
inspection of the IPC stage 1 rotor blades in accordance with 
paragraph 3.A.(1) of RR Alert NMSB Trent 1000 72-AK130.
    (2) Repeat the on-wing inspection of the IPC stage 1 rotor 
blades in accordance with paragraph 3.A.(1) of RR Alert NMSB Trent 
1000 72-AK130, Revision 2, dated July 26, 2018, and within the 
compliance times specified in Table 1 of that NMSB.
    (3) Within 15 days of the effective date of this AD, or within 
the compliance times specified in Table 1 of RR Alert NMSB Trent 
1000 72-AK130 Revision 2, dated July 26, 2018, whichever occurs 
later, perform on-wing inspection of the IPC stage 2 rotor blades 
and IPC shaft stage 2 dovetail posts in accordance with paragraph 
3.B.(1) and 3.C.(1) of RR Alert NMSB Trent 1000 72-AK130.
    (4) Repeat the on-wing inspection of the IPC stage 2 rotor 
blades and IPC shaft stage 2 dovetail posts in accordance with 
paragraphs 3.B.(1) and 3.C.(1) of RR Alert NMSB Trent 1000 72-AK130, 
Revision 2, dated July 26, 2018, and within the compliance times 
specified in Table 1 of RR Alert NMSB Trent 1000 72-AK130.
    (5) For the on-wing inspection required by paragraphs (g)(1) 
through (4) of this AD, provided the stated thresholds and intervals 
are not exceeded, you may substitute:
    (i) An in-shop inspection of an engine or module performed in 
accordance with the instructions of paragraphs 3.A.2, 3.B.2, and 
3.C.2 of the RR Alert NMSB Trent 1000 72-AK130, Revision 2, dated 
July 26, 2018; or
    (ii) an in-shop piece part inspection during refurbishment in 
accordance with the Accomplishment Instructions, paragraphs 
3.B.(2)(f)(vi), 3.B.(2)(g)(v), and 3.B.(3)(d)(iii) of RR Trent 1000 
NMSB 72-K132, dated June 29, 2018.
    (6) If any IPC stage 1 rotor blade, IPC stage 2 rotor blade, or 
an IPC shaft stage 2 dovetail post is found cracked during any 
inspection required by this AD, remove the part from service and 
replace the part with a part eligible for installation before 
further flight.

(h) Inspection After Operation Under Asymmetric Power

    As of the effective date of this AD, before the next flight 
after each occurrence where engine operation in asymmetric power 
conditions was sustained for more than 30 minutes at less than 
25,000 feet, either resulting from engine power reduction, or from 
engine in-flight shut-down (IFSD), inspect the IPC stage 1 rotor 
blades, stage 2 rotor blades and IPC shaft stage 2 dovetail posts in 
accordance with the paragraphs 3.A.(1), 3.B.(1), and 3.C.(1) of the 
RR Alert NMSB Trent1000 72-AK130, Revision 2, dated July 26, 2018 on 
the engine that did not experience the power reduction or IFSD 
installed on the airplane.

(i) Credit for Previous Actions

    You may take credit for the inspections required by paragraph 
(g)(1) and (3) of this AD if you performed these inspections before 
the effective date of this AD using RR Alert NMSB Trent 1000 72-
AK130, Revision 1, dated June 29, 2018, or RR Alert NMSB Trent 1000 
72-AK130, Initial Issue, dated June 11, 2018.

(j) Special Flight Permits

    (1) Special flight permits, as described in Section 21.197 and 
Section 21.199 of the Federal Aviation Regulations (14 CFR 21.197 
and 21.199), are subject to the requirements of paragraph (k)(1)(i) 
of this AD.
    (i) Operators who are prohibited from further flight due to an 
IPC stage 1 rotor blade, IPC stage 2 rotor blade, or an IPC shaft 
stage 2 dovetail post being found cracked, may perform a one-time 
non-revenue ferry flight to a location where the engine can be 
removed from service. This ferry flight must be performed without 
passengers, involve non-extended operations (ETOPS), and consume no 
more than three flight cycles.
    (ii) [Reserved]
    (2) [Reserved]

(k) 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 (l)(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.

(l) 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-
0167R2, dated October 16, 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-2018-0871.

(m) 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-AK130, Revision 2, dated July 26, 2018.

[[Page 62697]]

    (ii) RR Alert NMSB Trent 1000 72-K132, dated June 29, 2018.
    (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: royce.com">corporate.care@rolls-royce.com; internet: https://customers.rolls-royce.com/public/rollsroycecare.
    (4) You may view this service information at FAA, Engine & 
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, call 202-741-6030, or go to: 
http://www.archives.gov/federal-register/cfr/ibr-locations.html.