AD 2022-04-02

(a) Effective Date

    This airworthiness directive (AD) is effective March 29, 2022.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to 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.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by reports of high levels of wear on the 
seal fins on a small number of certain high-pressure turbine triple 
seals. The FAA is issuing this AD to ensure cooling airflow 
restoration to the intermediate-pressure turbine (IPT) disk rim 
during cruise by deactivating the modulated air system (MAS). The 
unsafe condition, if not addressed, could result in a temperature 
increase at the IPT disk rim when the MAS is active during cruise, 
resulting in failure of the IPT disk, loss of engine thrust control, 
and loss of the airplane.

(f) Compliance

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

(g) Required Actions

    Within the compliance time specified in figure 1 to paragraph 
(g) of this AD, deactivate the MAS control valves using the 
Accomplishment Instructions, paragraphs 3.A.(6) and 3.A.(7), of 
Rolls-Royce Alert Non-Modification Service Bulletin Trent 1000 75-
AK642, Initial Issue, dated November 30, 2020.
    Note 1 to paragraph (g): Deactivation of the MAS control valves 
on an engine required by paragraph (g) of this AD changes the engine 
to an approved configuration that will produce engine indicating and 
crew alerting system (EICAS) status messages ``ENG MAS VALVE L/R'' 
and ``ENG MAS SYS TEST L/R.'' Since MAS is purposely disabled after 
compliance with paragraph (g) of this AD, these status messages do 
not indicate inoperative (failed) equipment and, consequently, the 
operator's existing FAA-approved minimum equipment list (MEL) 
instructions and limitations, including the 120-day operation 
limitation, do not apply.
    Note 2 to paragraph (g): Deactivation of the MAS control valves 
on an engine as required by paragraph (g) of this AD does not 
produce the EICAS status message ``ENG MAS VALVE SENSOR L/R.'' 
Consequently, when this EICAS message displays, it remains 
indicative of inoperative equipment, even if

[[Page 9427]]

the MAS has been disabled as required by paragraph (g) of this AD. 
As a result, the corresponding MEL instructions and limitations 
apply whenever the EICAS status message ``ENG MAS VALVE SENSOR L/R'' 
is displayed.
[GRAPHIC] [TIFF OMITTED] TR22FE22.000

(h) 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 (i)(1) of this AD and email 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.

(i) Related Information

    (1) For more information about this AD, contact Kevin Clark, 
Aviation Safety 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 Union Aviation Safety Agency (EASA) AD 
2021-0009, dated January 8, 2021, for more information. You may 
examine the EASA AD in the AD docket at https://www.regulations.gov 
by searching for and locating Docket No. FAA-2021-0662.

(j) 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 Alert Non-Modification Service Bulletin Trent 
1000 75-AK642, Initial Issue, dated November 30, 2020.
    (ii) [Reserved]
    (3) For Rolls-Royce service information identified in this AD, 
contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, 
Derby, DE24 8BJ, United Kingdom; phone: +44 (0)1332 242424; fax: +44 
(0)1332 249936; 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 (817) 222-5110.
    (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.