AD 2019-07-09

(a) Effective Date

    This AD is effective May 28, 2019.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Rolls-Royce plc (RR) Trent 1000-A2, Trent 
1000-AE2, Trent 1000-C2, Trent 1000-CE2, Trent 1000-D2, Trent 1000-
E2, Trent 1000-G2, Trent 1000-H2, Trent 1000-J2, Trent 1000-K2, and 
Trent 1000-L2 model turbofan engines with intermediate-pressure 
compressor (IPC) rotor seal, part number (P/N) KH77674, installed.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by reports of IPC rotor seal failures. We 
are issuing this AD to prevent an IPC rotor seal failure. The unsafe 
condition, if not addressed, could result in loss of engine thrust 
control and reduced control of the airplane.

(f) Compliance

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

(g) Required Actions

    (1) Perform an on-wing borescope inspection (BSI) of the IPC 
rotor seal using the Accomplishment Instructions, Paragraph 3, of RR 
Alert Non-Modification Service Bulletin (NMSB) Trent 1000 72-AJ929, 
Initial Issue, dated November 23, 2017, as follows:
    (i) For engines with an IPC rotor seal with 300 cycles since new 
(CSN) or more as of the effective date of this AD, perform a BSI 
before the IPC rotor seal accumulates 400 flight cycles (FCs) after 
the effective date of this AD.
    (ii) For engines with an IPC rotor seal with less than 300 CSN 
as of the effective date of this AD, perform a BSI before the IPC 
rotor seal accumulates 300 CSN or within 100 FCs after the effective 
date of this AD, whichever is later.
    (iii) For engines that were modified to incorporate RR Service 
Bulletin (SB) Trent 1000 72-J704, Initial Issue, dated June 23, 
2017, before the effective date of this AD, perform a BSI before the 
IPC rotor seal accumulates 400 FCs since the shop visit modification 
or before the next flight, whichever occurs later.
    (2) Repeat the on-wing BSI at intervals in accordance with 
Figure 2 of RR Alert NMSB Trent 1000 72-AJ929, Initial Issue, dated 
November 23, 2017.
    (3) An in-shop inspection in accordance with the Accomplishment 
Instructions, Paragraph 3, of RR NMSB Trent 1000 72-J353, Revision 
2, dated February 14, 2018, may be substituted for an on-wing BSI as 
required by paragraphs (g)(1) and (2) of this AD, within the 
compliance times specified by paragraphs (g)(1) and (2) of this AD.
    (4) If a crack is found on the front face of the seal that is at 
or beyond the rejection limits specified in Figures 1, 2, and 3 of 
RR Alert NMSB Trent 1000 72-AJ929, Initial Issue, dated November 23, 
2017, replace the IPC rotor seal with a part eligible for 
installation before further flight.

(h) Operating Prohibition

    After the effective date of this AD, do not operate an aircraft 
that has two engines installed that are both required by this AD to 
complete either the 50 FCs interval inspections or the single 100 
FCs fly-on period as specified in Figures 1, 2, and 3 of RR Alert 
NMSB Trent 1000 72-AJ929, Initial Issue, dated November 23, 2017.

(i) Non-Required Action

    None of the reporting requirements referenced in RR Alert NMSB 
Trent 1000 72-

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AJ929, Initial Issue, dated November 23, 2017; RR SB Trent 1000 72-
J704, Initial Issue, dated June 23, 2017; or RR NMSB Trent 1000 72-
J353, Revision 2, dated February 14, 2018, are required by this AD.

(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 
ECO Branch, 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 Besian Luga, 
Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: 781-238-7750; fax: 781-238-7199; email: 
[email protected].
    (2) Refer to European Union Aviation Safety Agency (EASA) AD 
2018-0095, dated April 24, 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-2018-0611.

(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) Non-Modification Service Bulletin 
(NMSB) Trent 1000 72-J353, Revision 2, dated February 14, 2018.
    (ii) RR Service Bulletin Trent 1000 72-J704, Initial Issue, 
dated June 23, 2017.
    (iii) RR Alert NMSB Trent 1000 72-AJ929, Initial Issue, dated 
November 23, 2017.
    (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 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.