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2020-08-01 GENERAL ELECTRIC COMPANY:
Amendment 39-21107; Docket No. FAA-2019-0665; Project Identifier 2019-NE-25-AD.

(a) EFFECTIVE DATE

    This AD is effective May 15, 2020.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to  General Electric Company (GE) CF34-1A, CF34-3A,
    CF34-3A1, CF34-3A2, CF34-3B and CF34-3B1 model turbofan engines having
    a fan blade  with a part number listed in Planning Information,  para-
    graph 1.A.,  of  GE Service Bulletin (SB)  CF34-AL S/B 72-0314,  dated
    September 27, 2017  or of GE SB CF34-BJ S/B 72-0306,  dated  September
    27, 2017, and with any serial number listed in paragraph 4.,  Appendix
    A, of GE SB CF34-AL S/B 72-0314 or of GE SB CF34-BJ S/B 72-0306.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 7220, Turbine Engine Inlet
    Section.

(e) UNSAFE CONDITION

    This AD was prompted  by an in-flight failure  of a fan blade that led
    to  an in-flight  shutdown.  The  FAA is  issuing this  AD to  prevent
    failure of  the fan  blade. The  unsafe condition,  if not  addressed,
    could result in failure of one or more engines, loss of thrust control
    and loss of the airplane.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    Remove the affected fan blades  from service within 90 days  after the
    effective date of this AD and replace with a part eligible for install
    -ation.

(h) DEFINITION

    A part that is eligible for installation is any fan blade  other  than
    those identified by paragraph (c) of this AD  or  a fan blade that has
    been repaired per GE SB CF34-AL S/B 72-0148,  Revision 05,  dated July
    23, 2015; or GE SB CF34-BJ S/B 72-0123, Revision 04, dated October 21,
    2015.

(i) 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 in-
    spector 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
    (j) of this AD. 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.

(j) RELATED INFORMATION

    For more information about this AD, contact Christopher McGuire, Aero-
    space Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA,
    01803;  phone: 781-238-7120;  fax: 781-238-7199; email: chris.mcguire@
    faa.gov.

(k) 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) General Electric Company (GE)  Service Bulletin  (SB)  CF34-BJ S/B 72-
    0306, dated September 27, 2017.

(ii) GE SB CF34-AL S/B 72-0314, dated September 27, 2017.

(3) For GE service information identified  in  this  AD,  contact  General
    Electric Company, GE Aviation, Room 285, 1 Neumann Way, Cincinnati, OH
    45215; phone: 513-552-3272; email: aviation.fleetsupport@ge.com.

(4) You may view  this service information  at  FAA,  Engine and Propeller
    Standards Branch, 1200 District Avenue, Burlington, MA, 01803. For in-
    formation 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
    fedreg.legal@nara.gov,  or  go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on April 3, 2020.  Lance T. Gant, Director, Compliance & Airworthi-
ness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Christopher McGuire,  Aerospace Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA, 01803;  phone: 781-
238-7120; fax: 781-238-7199; email: chris.mcguire@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0665; Project Identifier 2019-NE-25-AD; Amendment
39-21107; AD 2020-08-01]
RIN 2120-AA64

Airworthiness Directives; General Electric Company Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain General Electric Company (GE) CF34-1A, CF34-3A, CF34-3A1, CF34-
3A2, CF34-3B, and CF34-3B1 model turbofan engines. This AD was prompted
by an in-flight failure of a fan blade that led to an in-flight
shutdown. This AD requires removal and replacement of the affected fan
blades. The FAA is issuing this AD to address the unsafe condition on
these products.

DATES: This AD is effective May 15, 2020.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of May 15, 2020.

ADDRESSES: For service information identified in this final rule,
contact General Electric Company, GE Aviation, Room 285, 1 Neumann Way,
Cincinnati, OH, 45215; phone: 513-552-3272; email:
aviation.fleetsupport@ge.com. You may view this service information at
the FAA, Engine and Propeller Standards 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 on the
internet at https://www.regulations.gov by searching for and locating
Docket No. FAA-2019-0665.

Examining the AD Docket

You may examine the AD docket on the internet at https://www.regulations.gov
by searching for and locating Docket No. FAA-2019-
0665; 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 regulatory evaluation, 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
: Christopher McGuire, Aerospace
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA, 01803;
phone: 781-238-7120; fax: 781-238-7199; email: chris.mcguire@faa.gov.

SUPPLEMENTARY INFORMATION
:

Discussion

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain GE CF34-1A,
CF34-3A, CF34-3A1, CF34-3A2, CF34-3B, and CF34-3B1 model turbofan
engines. The NPRM published in the Federal Register on October 15, 2019
(84 FR 55073). The NPRM was prompted by an in-flight failure of a fan
blade that led to an in-flight shutdown. The NPRM proposed to require
removal and replacement of the affected fan blades. The FAA is issuing
this AD to address the unsafe condition on these products.

Comments

The FAA gave the public the opportunity to participate in
developing this final rule. The FAA considered the comment received. An
individual commenter supported the NPRM.

Conclusion

The FAA reviewed the relevant data, considered the comments
received, and determined that air safety and the public interest
require adopting this final rule as proposed.

Related Service Information Under 1 CFR Part 51


The FAA reviewed GE Service Bulletin (SB) CF34-BJ S/B 72-0306,
dated September 27, 2017, and GE SB CF34-AL S/B 72-0314, dated
September 27, 2017. GE SB CF34-BJ S/B 72-0306 describes procedures for
removal and replacement of affected fan blades installed on CF34-1A, -
3A, -3A1, -3A2, and -3B model turbofan engines. GE SB CF34-AL S/B 72-
0314 describes procedures for removal and replacement of affected fan
blades installed on CF34-3A1 and -3B1 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 the ADDRESSES section.

Other Related Service Information


The FAA also reviewed GE SB CF34-AL S/B 72-0148, Revision 05, dated
July 23, 2015; and GE SB CF34-BJ S/B 72-0123, Revision 04, dated
October 21, 2015. GE SB CF34-AL S/B 72-0148 describes procedures for
repair of fan blades installed on GE CF34-3A1 and -3B1 model turbofan
engines. GE SB CF34-BJ S/B 72-0123 describes procedures for repair of
fan blades installed on GE CF34-1A, -3A, -3A1, -3A2, and -3B model
turbofan engines.

Costs of Compliance

The FAA estimates that this AD affects 121 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
Remove and replace fan blade 2 work-hours x $85 per hour = $170
$11,000
$11,170
$1,351,570

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.

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 (AD):