preamble attached >>>
ADs updated daily at www.Tdata.com
2021-12-07 ROLLS-ROYCE DEUTSCHLAND LTD & CO KG (TYPE CERTIFICATE PREVIOUSLY HELD BY ROLLS-ROYCE DEUTSCHLAND GMBH, FORMERLY BMW ROLLS-ROYCE GMBH): Amendment 39-21594; Docket No. FAA-2020-1174; Project Identifier MCAI-2019-00135-E.
(a) EFFECTIVE DATE

    This AD is effective August 12, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to  Rolls-Royce Deutschland  Ltd &  Co KG (RRD) (Type
    Certificate previously held by Rolls-Royce Deutschland GmbH,  formerly
    BMW RollsRoyce GmbH) BR700-710A1-10, BR700-710A2-20 and BR700-710C4-11
    model turbofan engines with a high-pressure turbine (HPT) stage 1 disk
    having a part number and serial number listed in Planning Information,
    paragraph 1.A., of Rolls-Royce Alert Non-Modification Service Bulletin
    (NMSB)  SB-BR700-72-A900659,  Revision  1,  dated  November  5,  2019,
    installed.

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD  was prompted  by an  investigation by  RRD, which  revealed a
    quality  escape  during  the HPT  stage 1  disk rim  cooling air  hole
    manufacturing process. The FAA is  issuing this AD to prevent  failure
    of the HPT stage 1 disk. The unsafe condition, if not addressed, could
    result in the release of  high-energy debris, damage to the  airplane,
    and reduced control of the airplane.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    Before the affected HPT stage 1 disk exceeds 2,840 flight cycles (FCs)
    since new,  or within  60 days  after the  effective date  of this AD,
    whichever occurs later, but not to exceed 8 years after the  effective
    date of this  AD if using  FCs, remove the  affected HPT stage  1 disk
    from  service  and  replace with  a  part  eligible for  installation.
    Guidance  on  replacing the  HPT  stage 1  disk  can be  found  in the
    Accomplishment Instructions, paragraph 3.B., of Rolls-Royce Alert  Non
    -Modification Service Bulletin (NMSB) SBBR700-72-A900659,  Revision 1,
    dated November 5, 2019.

(h) INSTALLATION PROHIBITION

    After the effective date of this  AD, do not install any affected  HPT
    stage 1 disk onto any engine.

(i) DEFINITION

    For the purpose of this AD,  a "part eligible for installation" is  an
    HPT stage 1 disk that is  not listed in paragraph 1.A. of  Rolls-Royce
    Alert NMSB SB-BR700-72-A900659, Revision 1, dated November 5, 2019.

(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 Related
    Information. 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 2019-0299,
    dated December  10, 2019,  for more  information. You  may examine the
    EASA  AD  in  the  AD  docket  on  at  https://www.regulations.gov  by
    searching for and locating Docket No. FAA-2020-1174.

(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  Alert  Non - Modification  Service  Bulletin SB-BR700-72-
    A900659, Revision 1, dated November 5, 2019.

(ii) [Reserved]

(3) For service information  identified  in this AD,  contact  Rolls-Royce
    Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz 15827, Germany; phone
    +49 33 7086 4040; email: rrd.techhelp@rolls-royce.com.

(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:
    fedreg.legal@nara.gov,  or  go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on June 14, 2021. Gaetano A. Sciortino, Deputy Director for Strate-
gic Initiatives,  Compliance & Airworthiness Division, Aircraft Certifica-
tion 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-2020-1174; Project Identifier MCAI-2019-00135-E;
Amendment 39-21594; AD 2021-12-07]
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) BR700-710A1-10,
BR700-710A2-20 and BR700-710C4-11 model turbofan engines. This AD was
prompted by an investigation by RRD, which revealed a quality escape
during the high-pressure turbine (HPT) stage 1 disk rim cooling air
hole manufacturing process. This AD requires removing affected HPT
disks from service prior to reaching specified compliance times or at
the next engine shop visit, whichever occurs first. The FAA is issuing
this AD to address the unsafe condition on these products.

DATES: This AD is effective August 12, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 12,
2021.

ADDRESSES: For service information identified in this AD, contact
Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz 15827,
Germany; phone: +49 33 7086 4040; email: rrd.techhelp@rolls-royce.com.
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-2020-1174.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2020-1174; 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-
710A1-10, BR700-710A2-20 and BR700-710C4-11 model turbofan engines. The
NPRM published in the Federal Register on January 21, 2021 (86 FR
6271). The NPRM was prompted by an investigation by RRD, which revealed
a quality escape during the HPT stage 1 disk rim cooling air hole
manufacturing process. In the NPRM, the FAA proposed to require
removing affected HPT disks from service prior to reaching specified
compliance times or at the next engine shop visit, whichever occurs
first. 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 2019-0299, dated December 10, 2019 (referred to after
this as ``the MCAI''), to address the unsafe condition on these
products. The MCAI states:

An occurrence was reported of an HPT stage 1 disc burst on an
industrial gas turbine engine. Subsequent investigation revealed a
quality escape during HPT stage 1 disc rim cooling air hole
manufacturing process. A review revealed that 28 HPT stage 1 discs
were subject to a similar quality escape, two of which have been
recovered and removed from service. The consequence of this
manufacturing error is that the affected parts can no longer safely
reach their Declared Safe Cyclic Life (DSCL).
This condition, if not corrected, may lead to failure of an
affected part, 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 remove the engine from service for in-shop
replacement of the affected part.
For the reasons described above, this [EASA] AD reduces the DSCL
for the affected parts, requires identification of the affected parts and removal
from service of each affected engine for replacement of the affected
part. This [EASA] AD also prohibits (re)installation of affected
parts.

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-2020-1174.

Discussion of Final Airworthiness Directive

Comments

The FAA received comments from two commenters. The commenters were
the Air Line Pilots Association, International (ALPA) and an anonymous
commenter. ALPA supported the NPRM without change. The anonymous
commenter supported the NPRM but stated their opinion on the estimated
costs.

Request for Rolls-Royce To Share Replacement Part Cost

An anonymous commenter indicated that Rolls-Royce could share the
cost of new HPT disks since it was their manufacturing process that
caused the defects in the HPT disks.
The FAA does not determine who pays for the costs of an AD. The
Estimated Costs paragraph indicates that, according to the
manufacturer, all of the costs of this AD may be covered under a
manufacturer warranty, thereby reducing the cost impact on affected
operators.

Conclusion

The FAA reviewed the relevant data, considered the 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, this
AD is adopted as proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Rolls-Royce Alert Non-Modification Service
Bulletin (NMSB) SB-BR700-72-A900659, Revision 1, dated November 5, 2019
(the NMSB). The Alert NMSB provides the part numbers and serial numbers
for affected HPT disks, the serial numbers for all engines with an
affected HPT disk installed, and instructions for replacement of the
affected HPT disk. 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.

Costs of Compliance

The FAA estimates that this AD affects 21 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
Replace HPT disk 20 work-hours x $85 per hour = $1,700
$550,000
$551,700
$11,585,700

The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, all of the costs of this AD may
be covered under warranty, thereby reducing the cost impact on affected
operators.

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 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.

Adoption of 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: