AD 2020-20-07

(a) Effective Date

    This AD is effective November 10, 2020.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all:
    (1) Rolls-Royce Deutschland Ltd & Co KG (RRD) (Type Certificate 
previously held by Rolls-Royce plc) Trent 1000-AE3, Trent 1000-CE3, 
Trent 1000-D3, Trent 1000-G3, Trent 1000-H3, Trent 1000-J3, Trent 
1000-K3, Trent 1000-L3, Trent 1000-M3, Trent 1000-N3, Trent 1000-P3, 
Trent 1000-Q3, and Trent 1000-R3 model turbofan engines.
    (2) RRD Trent 7000-72 and Trent 7000-72C model turbofan engines.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by a report of crack findings in the front 
air seal on the intermediate-pressure compressor (IPC) shaft 
assembly during the stripping of a flight test engine. The FAA is 
proposing this AD to prevent failure of the IPC shaft assembly. The 
unsafe condition, if not addressed, could result in loss of 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) Within the compliance times specified in Table 1 to 
paragraph (g)(1) of this AD, and thereafter, at intervals not to 
exceed 200 flight cycles (FCs), perform a borescope inspection (BSI) 
of the IPC shaft assembly, part number KH18436, using the 
Accomplishment Instructions, paragraph 3.B., of Rolls-Royce (RR) 
Trent 1000 Alert Non-Modification Service Bulletin (NMSB) 72-AK451, 
Initial Issue, dated November 14, 2019.
[GRAPHIC] [TIFF OMITTED] TR06OC20.002

    (2) An in-shop BSI of the IPC shaft assembly using the 
Accomplishment Instructions, paragraph 3.A, of RR Trent 1000 Alert 
NMSB 72-AK451, Initial Issue, dated November 14, 2019, or visual 
inspection of the IPC shaft assembly using FAA-approved maintenance 
procedures if the part is exposed, may be substituted for any on-
wing BSI, provided the compliance time specified in paragraph (g)(1) 
of this AD is not exceeded.
    (3) If, during any initial or repetitive BSI or visual 
inspection of the IPC shaft assembly required by paragraph (g)(1) or 
(2) of this AD, any crack is detected, before further flight, remove 
the IPC shaft assembly and replace it with a part eligible for 
installation.

(h) Definitions

    For the purpose of this AD, a ``part eligible for installation'' 
is:
    (1) An IPC shaft assembly that is new (not previously installed 
on an engine);
    (2) An IPC shaft assembly that, before (re)installation, has 
passed a BSI (no crack detected) using the Accomplishment 
Instructions, paragraph 3.A. or B., of RR Trent 1000 Alert NMSB 72-
AK451, Initial Issue, dated November 14, 2019.
    (3) An IPC shaft assembly that, before (re)installation, has 
passed a visual inspection of the exposed part (no crack detected) 
using FAA-approved maintenance procedures.

(i) No Reporting Requirement

    The reporting requirements in the Accomplishment Instructions, 
paragraphs 3.A. and 3.B., of RR Trent 1000 Alert NMSB

[[Page 62979]]

72-AK451, Initial Issue, dated November 14, 2019, are not required 
by this AD.

(j) Credit for Previous Actions

    You may take credit for the initial BSI of the IPC shaft 
assembly that is required by paragraph (g)(1) of this AD if you 
performed the BSI before the effective date of this AD using RR 
Trent 1000 NMSB 72-K452, Initial Issue, dated October 21, 2019.

(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 
ECO Branch, 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 Stephen Elwin, 
Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: 781-238-7236; fax: 781-238-7199; email: 
[email protected].
    (2) Refer to European Union Aviation Safety Agency (EASA) AD 
2019-0282, dated November 20, 2019, for more information. You may 
examine the EASA AD in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-
2020-0293.

(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 (RR) Trent 1000 Alert Non-Modification Service 
Bulletin 72-AK451, Initial Issue, dated November 14, 2019.
    (ii) [Reserved]
    (3) For RR service information identified in this AD, contact 
Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, 15827 
Blankenfelde-Mahlow, Germany; phone: +49 (0) 33 708 6 0; website: 
https://www.rolls-royce.com/contact-us.aspx.
    (4) You may view this service information at FAA, Airworthiness 
Products Section, Operational Safety 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, email: [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.