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2021-21-12 ROLLS-ROYCE DEUTSCHLAND LTD & CO KG (TYPE CERTIFICATE PREVIOUSLY HELD BY ROLLS-ROYCE DEUTSCHLAND GMBH, FORMERLY BMW ROLLS-ROYCE GMBH): Amendment 39-21772; Docket No. FAA-2021-0257; Project Identifier MCAI-2020-00712-E.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective December 13, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to  Rolls-Royce  Deutschland  Ltd  &  Co  KG  (Type
    Certificate previously held by Rolls-Royce Deutschland GmbH,  formerly
    BMW Rolls-Royce GmbH) (RRD) BR700-710A2-20 model turbofan engines:

(1) Installed and operated  on a Bombardier Model  BD-700-1A10 and BD-700-
    1A11 airplane, with serial number  9381, 9386, 9401, or 9432  to 9786,
    inclusive, that have not incorporated Bombardier Service Bulletin (SB)
    700-34-5021,  Revision  04,  dated  February  11,  2021,  or   earlier
    revision, or  Bombardier SB  700-34-6021, Revision  04, dated February
    11, 2021, or earlier revision,  as applicable, referred to after  this
    as a "pre-mod airplane," or

(2) Installed and operated on a pre-mod airplane at any time after January
    1, 2017.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 7230,  Turbine Engine Com-
    pressor Section.

(e) UNSAFE CONDITION

    This AD was prompted by  flight data obtained from airplanes  equipped
    with certain Rockwell Collins avionics and auto-throttle systems which
    demonstrated significant  oscillation of  the engine  rotor revolution
    speed during flight. The FAA is issuing this AD to prevent failure  of
    an  affected life-limited  part (LLP).  The unsafe  condition, if  not
    addressed, could result in uncontained release of high-energy  debris,
    damage to the engine, and damage to the airplane.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) REQUIRED ACTIONS

(1) Within 90 days  after the effective date of this AD,  recalculate  the
    consumed and  remaining service life of each affected LLP using Accom-
    plishment Instructions, paragraph 3.D.,  of RRD Alert Non-Modification
    Service Bulletin (NMSB) SB-BR700-72-A900584 Revision 2, dated November
    22, 2017 (the NMSB).

(2) For engines installed and operated on a pre-mod airplane,  after  per-
    forming the  initial recalculations  required by  paragraph (g)(1)  of
    this AD, for each flight, calculate the consumed and remaining service
    life of each affected LLP  using paragraph 3.D. of the  Accomplishment
    Instructions of the NMSB.

(3) Remove each affected LLP prior to exceeding its approved life limit or
    within 90 days after the effective date of this AD,  whichever  occurs
    later.

(h) CREDIT FOR PREVIOUS ACTIONS

    You may take credit  for the recalculation of the consumed and remain-
    ing service life of each LLP required  by paragraph (g)(1)  of this AD
    if the action was performed before the effective date of this AD using
    RRD Alert NMSB SB-BR700-72-A900584, Revision 1, dated October 5, 2017,
    or original issue, dated January 31, 2017.

(i) DEFINITION

    For the purpose of this AD,  an affected LLP is:  a  low-pressure com-
    pressor (LPC) disk,  LPC fan blade,  fan  shaft,  low-pressure turbine
    (LPT)  stage 1 disk,  LPT stage 2 disk,  LPT rotor shaft  and  annulus
    filler, high-pressure compressor (HPC) stage 1-6 rotor disk, HPC stage
    7-10 rotor disk, curvic ring, high-pressure turbine (HPT) stage 1 disk
    and an HPT stage 2 disk.

(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  certification
    office, send it to the attention of the person identified in paragraph
    (k)(1). You may email your request to: ANE-AD-AMOC@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector, 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 Wego Wang, Aviation Safety
    Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
    phone: (781) 238-7134; fax: (781) 238-7199; email: Wego.Wang@faa.gov.

(2) Refer  to  European Union Aviation Safety Agency (EASA)  AD 2018-0268,
    dated December 11, 2018, 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-2021-0257.

(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  Deutschland  Ltd  &  Co KG Alert Non-Modification Service
    Bulletin SB-BR700-72-A900584, Revision 2, dated November 22, 2017.

(ii) [Reserved]

(3) For Rolls-Royce Deutschland service information identified in this AD,
    contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11,  Dahlewitz,
    15827 Blankenfelde-Mahlow, Germany;  phone: +49 (0) 33 7086-4040;  web
    site: 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 refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability of this material  at NARA,  email: fr.
    inspection@nara.gov,   or   go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on October 8, 2021. Lance T. Gant, Director, Compliance & Airworth-
iness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:  Wego Wang, Aviation Safety Engineer, ECO
Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-
7134; fax: (781) 238-7199; email: Wego.Wang@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0257; Project Identifier MCAI-2020-00712-E;
Amendment 39-21772; AD 2021-21-12]
RIN 2120-AA64

Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG
(Type Certificate Previously Held by Rolls-Royce Deutschland GmbH,
Formerly BMW Rolls-Royce GmbH) Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Rolls-Royce Deutschland Ltd & Co KG (RRD) BR700-710A2-20 model
turbofan engines. This AD was prompted by flight data obtained from
airplanes equipped with certain Rockwell Collins avionics and auto-
throttle systems that demonstrated significant oscillation of the
engine rotor revolution speed during flight. This AD requires initial
and repetitive recalculation of the consumed and remaining service life
of certain life-limited parts (LLPs). This AD also
requires removal of an LLP prior to its approved life limit or within
90 days after the effective date of this AD, whichever occurs later.
The FAA is issuing this AD to address the unsafe condition on these
products.

DATES: This AD is effective December 13, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of December 13,
2021.

ADDRESSES: For service information identified in this final rule,
contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz,
15827 Blankenfelde-Mahlow, Germany; phone: +49 (0) 33 7086-4040;
website: https://www.rolls-royce.com/contact-us.aspx. You may view this
service information at the 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. It is also available at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0257.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0257; or in person at
Docket Operations between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays. The AD docket contains this final rule, the
mandatory continuing airworthiness information (MCAI), any comments
received, and other information. The address for Docket Operations is
U.S. Department of Transportation, Docket Operations, M-30, West
Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE,
Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Wego Wang, Aviation Safety Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
(781) 238-7134; fax: (781) 238-7199; email: Wego.Wang@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain RRD BR700-
710A2-20 model turbofan engines. The NPRM published in the Federal
Register on April 2, 2021 (86 FR 17326). The NPRM was prompted by
flight data obtained from airplanes equipped with certain Rockwell
Collins avionics and auto-throttle systems that demonstrated
significant oscillation of the engine rotor revolution speed during
flight. In the NPRM, the FAA proposed to require initial and repetitive
recalculation of the consumed and remaining service life of certain
LLPs. The NPRM also proposed to require removal of an LLP prior to its
approved life limit or within 90 days after the effective date of this
AD, whichever occurs later. The FAA is issuing this AD to address the
unsafe condition on these products.
The European Union Aviation Safety Agency (EASA), which is the
Technical Agent for the Member States of the European Community, has
issued EASA AD 2018-0268, dated December 11, 2018 and corrected on
February 20, 2019 (referred to after this as ``the MCAI''), to address
the unsafe condition on these products. The MCAI states:

Flight data obtained from aeroplanes equipped with certain
Rockwell Collins avionics and auto-throttle system demonstrated
significant oscillation of the engine rotor revolution speed during
cruise. Analysis indicates that this affects the service life of the
affected LLP.
This condition, if not corrected, may lead to failure of an
affected LLP, possibly resulting in release of high-energy debris,
with consequent damage to, and/or reduced control of, the aeroplane.
To address this potentially unsafe condition, RRD issued the NMSB,
providing instructions to recalculate the consumed and remaining
service life of the affected LLP.
For the reasons described above, this [EASA] AD requires
repetitive recalculation of the service life (consumed and
remaining) of each affected LLP and, depending on the results,
replacement of each affected LLP before exceeding the life limit,
taking the re-calculated life consumption into account.

You may obtain further information by examining the MCAI in the AD
docket at https://www.regulations.gov by searching for and locating
Docket No. FAA-2021-0257.

Discussion of Final Airworthiness Directive

Comments

The FAA received comments from one commenter, NetJets Aviation
(NJA). The following presents the comments received on the NPRM and the
FAA's response to each comment.

Request To Confirm Compliance With Previous Action

NJA asked if they are in compliance with this AD if they performed
the required actions using Bombardier Service Bulletin (SB) 700-34-5021
or Bombardier SB 700-34-6021, revisions earlier than Revision 3, dated
January 5, 2018, as applicable. NJA reasoned that paragraph (c),
Applicability, of the proposed AD references only Revision 3 of
Bombardier SB 700-34-5021 and Bombardier SB 700-34-6021 (Bombardier
SBs). NJA states that it performed the required actions using Revision
2 of the Bombardier SBs before the effective date of this AD. NJA also
referenced language from Revision 3 of the Bombardier SBs that
indicates no further action is necessary if operators performed the
action using earlier revisions of the Bombardier SBs.
The FAA notes that NJA would be in compliance with the required
actions of this AD if they performed those actions using the earlier
versions of the Bombardier SBs to meet the requirements of this AD. The
FAA updated paragraph (h), Credit for Previous Actions, of this AD to
give credit for using earlier revisions of the Bombardier SBs if the
actions were performed before the effective date of this AD.

Request To Confirm Compliance for Simultaneous Actions

NJA asked if they would be in compliance with the required actions
of this AD, based on paragraph (h), Credit for Previous Actions, if
they complied with the Bombardier SBs and RRD Alert Non-Modification
Service Bulletin SB-BR700-72-A900584, Revision 2, dated November 22,
2017 (the NMSB), at the same time before the fleet accumulated 500
flight cycles. NJA indicated that the Accomplishment Instructions,
paragraphs 3.A.(1) and (2), of the NMSB apply only to the low-pressure
compressor (LPC) disk whereas this AD applies to all LLPs.
The FAA notes that NJA would be in compliance with the replacement
of the LPC disk required by paragraph (g)(3) of this AD if they
performed the action before the effective date of this AD. Paragraph
(f) of this AD mandates compliance with this AD within the compliance
times specified, unless already done.

Update to Service Information

The FAA determined the need to incorporate the latest service
information in this AD. The FAA revised the reference to Bombardier SB
700-34-5021 in paragraph (c) of this AD from Revision 03, dated January
5, 2018, to Revision 04, dated February 11, 2021, or earlier revision,
and Bombardier SB 700-34-6021 in paragraph (c) of this AD from Revision
03, dated January 5, 2018, to Revision 04, dated February 11, 2021, or
earlier revision. This change does not change the number of affected
engines that the FAA estimated in the NPRM and imposes no additional
burden on operators who are required to comply with this AD.

Conclusion

The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, and
any other changes described previously, this AD is adopted as proposed
in the NPRM. None of the changes will increase the economic burden on
any operator.

Related Service Information Under 1 CFR Part 51

The FAA reviewed RRD Alert Non-Modification Service Bulletin SB-
BR700-72-A900584, Revision 2, dated November 22, 2017. The NMSB
describes procedures for amending flight cycle counting requirements
for affected LLPs on RRD BR700-710A2-20 model turbofan engines. This
service information is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in ADDRESSES.

Other Related Service Information

The FAA reviewed Bombardier SB 700-34-5021, Revision 04, dated
February 11, 2021, and Bombardier SB 700-34-6021, Revision 04, dated
February 11, 2021. These SBs describe procedures for the implementation
of the Global Vision Flight Deck Version 5 (V5) software load on
Bombardier Inc. Model BD-700-1A11 and BD-700-1A10 airplanes,
respectively.

Costs of Compliance

The FAA estimates that this AD affects 284 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

Estimated Costs

Action
Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Recalculate service life for affected LLPs 20 work-hours x $85 per hour = $85
$0
$1,700
$482,800

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.

Regulatory Findings

This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES


1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]


2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive: