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2022-14-12 GE AVIATION CZECH S.R.O. (TYPE CERTIFICATE PREVIOUSLY HELD BY WALTER ENGINES A.S., WALTER A.S., AND MOTORLET A.S.): Docket No. FAA-2022-0385; Project Identifier MCAI-2021-00786-E.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective August 18, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to:

(1) GE Aviation Czech s.r.o. (GEAC)  M601F model turboprop engines with an
    engine serial number  (ESN)  listed in Attachment 1,  List of Affected
    Engines - Group 1,  of GE Aviation Czech Alert Service Bulletin  (ASB)
    ASB-M601F-72-10-00-0056 [02], ASB-M601D-72-10-00-0072 [02], ASB-M601E-
    72-10-00-0103 [02], and ASB-M601Z-72-10-00-0056 [02] (single document;
    formatted as service bulletin identifier [revision number]), dated May
    31, 2021 (the ASB);

(2) M601E-11 and M601E-11A model turboprop engines  with an ESN  listed in
    Attachment 2, List of Affected Parts - Group 2, of the ASB; and

(3) M601D-11, M601E-11AS, and M601E-11S model turboprop engines  with pro-
    peller shaft part number (P/N) M601-6081.2 or P/N M601-6081.4.

(d) SUBJECT

    Joint Aircraft System Component (JASC)  Code 7210,  Turbine Engine Re-
    duction Gear.

(e) UNSAFE CONDITION

    This AD was prompted by the absence of life limits for propeller shaft
    P/N  M601-6081.6  in  the  airworthiness  limitations  section  of the
    applicable GEAC M601 Engine Shop Manual.  This AD was also prompted by
    a report that operators may not have been provided with enough data to
    determine the accumulated life of certain propeller shafts. The FAA is
    issuing this  AD to  prevent the  failure of  the propeller shaft. The
    unsafe condition,  if not  addressed, could  result in  damage to  the
    engine, damage to the airplane, and reduced control of the airplane.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

(1) For affected M601F model turboprop engines, before the propeller shaft
    accumulates 12,000 flight hours  (FHs) since first installation  on an
    engine, or  before accumulating  350 FHs  after the  effective date of
    this  AD,  whichever  occurs later,  remove  the  propeller shaft  and
    replace with a part eligible for installation.

(2) For affected  M601D-11, M601E-11, M601E-11A, M601E-11AS, and M601E-11S
    model turboprop engines:

(i) Within 100 FHs after the effective date  of  this  AD,  calculate  the
    total time since new of the propeller shaft  in  accordance  with  the
    Accomplishment Instructions, section 2.2 Group 2 Engines, paragraph 1.
    of the ASB.

(ii) Remove the propeller shaft  prior  to  reaching  its  applicable life
     limit and replace with a part eligible for installation in accordance
     with  the  Accomplishment Instructions,  section 2.2 Group 2 Engines,
     paragraph 2., of the ASB.

(h) DEFINITIONS

(1) For the purpose  of  this  AD,  a  "part eligible for installation" on
    M601F, M601E-11, and M601E-11A model  turboprop engines is a propeller
    shaft  identified  in  the  Configuration Description,  paragraph 1.5,
    Table 1, of the ASB, as applicable to the engine model,  with a calcu-
    lated life that has not exceeded the applicable life limit.

(2) For the purpose  of  this  AD,  a  "part eligible for installation" on
    M601D-11 model turboprop engines is a propeller shaft  with  P/N M601-
    6081.2, P/N M601-6081.4, or P/N M601-6081.5,  with  a  calculated life
    that has not exceeded the applicable life limit.

(3) For the purpose  of  this  AD,  a  "part eligible for installation" on
    M601E-11AS and M601E-11S model  turboprop engines is a propeller shaft
    with P/N M601-6081.2, P/N M601-6081.5, or P/N M601-6081.6, with a cal-
    culated life that has not exceeded the applicable life limit.

(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
    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
    (j)(1) of this AD and email 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

(1) For more information about this AD, contact Barbara Caufield, Aviation
    Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA
    01803; phone: (781) 238-7146; email: barbara.caufield@faa.gov.

(2) Refer  to  European Union Aviation Safety Agency  (EASA) AD 2021-0154,
    dated July 1, 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-2022-0385.

(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) GE Aviation Czech Alert Service Bulletin (ASB) ASB-M601F-72-10-00-0056
    [02], ASB-M601D-72-10-00-0072 [02],  ASB-M601E-72-10-00-0103 [02], and
    ASB-M601Z-72-10-00-0056 [02] (single document;  formatted  as  service
    bulletin identifier [revision number]), dated May 31, 2021.

(ii) [Reserved]

(3) For GE Aviation Czech service information identified in this AD,  con-
    tact GE Aviation Czech s.r.o., Beranovych 65, 199 02 Praha 9, Letnany,
    Czech Republic; phone: +420 222 538 111.

(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 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 June 29, 2022.  Christina Underwood, Acting Director, Compliance
& Airworthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:Barbara Caufield, Aviation Safety Engineer
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;  phone: (781)
238-7146; email: barbara.caufield@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0385; Project Identifier MCAI-2021-00786-E;
Amendment 39-22117; AD 2022-14-12]
RIN 2120-AA64

Airworthiness Directives; GE Aviation Czech s.r.o. (Type
Certificate Previously Held by WALTER Engines a.s., Walter a.s., and
MOTORLET a.s.) Turboprop Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain GE Aviation Czech s.r.o. (GEAC) M601D-11, M601E-11, M601E-11A,
M601E-11AS, M601E-11S, and M601F model turboprop engines. This AD was
prompted by the absence of life limits for propeller shaft part number
(P/N) M601-6081.6 in the airworthiness limitations section (ALS) of the
applicable GEAC M601 Engine Shop Manual. This AD was also prompted by a
report that operators may not have been provided with enough data to
determine the accumulated life of certain propeller shafts. For M601F
model turboprop engines, this AD requires removal and replacement of
the propeller shaft before the propeller shaft accumulates 12,000
flight hours (FHs) since first installation on an engine, or before
accumulating 350 FHs after the effective date of this AD, whichever
occurs later, with a part eligible for installation. For M601D-11,
M601E-11, M601E-11A, M601E-11AS, and M601E-11S model turboprop engines,
this AD requires calculation of the accumulated life of the propeller
shaft and, depending on the number of accumulated FHs removal and
replacement of the propeller shaft with a part eligible for
installation. The FAA is issuing this AD to address the unsafe
condition on these products.

DATES: This AD is effective August 18, 2022.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 18,
2022.

ADDRESSES: For service information identified in this final rule,
contact GE Aviation Czech s.r.o., Beranovych 65, 199 02 Praha 9,
Letnany, Czech Republic; phone: +420 222 538 111. 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
(817) 222-5110. It is also available at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0385.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0385; 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: Barbara Caufield, Aviation Safety
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
phone: (781) 238-7146; email: barbara.caufield@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 GEAC M601D-11,
M601E-11, M601E-11A, M601E-11AS, M601E-11S, and M601F model turboprop
engines. The NPRM published in the Federal Register on April 01, 2022
(87 FR 19029). The NPRM was prompted by the absence of life limits for
propeller shaft P/N M601-6081.6 in the ALS of the applicable GEAC M601
Engine Shop Manual. The NPRM was also prompted by a report that
operators may not have been provided with enough data to determine the
accumulated life of certain propeller shafts. For M601F model turboprop
engines, the NPRM proposed to require removal and replacement of the
propeller shaft with a part eligible for installation before the
propeller shaft accumulates 12,000 FHs since first installation on an
engine, or before accumulating 350 FHs after the effective date of this
AD, whichever occurs later. For M601D-11, M601E-11, M601E-11A, M601E-
11AS, and M601E-11S model turboprop engines, the NPRM proposed to
require calculation of the accumulated life of the propeller shaft and,
depending on the number of accumulated FHs, removal and replacement of
the propeller shaft with a part eligible for installation. 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 Union, has issued
EASA AD 2021-0154, dated July 1, 2021 (referred to after this as ``the
MCAI''), to address the unsafe condition on these products. The MCAI
states:

It has been determined that the life limit for the propeller
shaft P/N M601-6081.6 is not published in the applicable ALS for
M601 engines. In addition, it has also been reported that some data,
which can be used to determine the accumulated life of certain
propeller shafts, may have not been provided to operators, so the
propeller shaft life limit may not have been implemented correctly.
These conditions, if not corrected, may lead to failure of a
propeller shaft, possibly resulting in detachment of the propeller
and consequent damage to the engine and/or the aircraft, and reduced
control of the aeroplane.
To address this potential unsafe condition, GEAC issued the
original issue of the ASB, providing applicable instructions, and
EASA issued AD 2021-0052 to require implementation of the applicable
life limit and replacing each propeller shaft with a serviceable
propeller shaft.
Since that [EASA] AD was issued, additional data, which can be
used to determine the accumulated life of certain propeller shafts,
and to support an extended compliance time for Group 1 engines, has
been made available; GEAC revised accordingly the ASB (now at
revision 02).
For the reasons described above, this [EASA] AD partially
retains the requirements of EASA AD 2021-0052, which is superseded,
introducing updated affected population and different compliance
times.

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-2022-0385.

Discussion of Final Airworthiness Directive

Comments

The FAA received no comments on the NPRM or on the determination of
the costs.

Conclusion

The FAA reviewed the relevant data 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.
None of the changes will increase the economic burden on any operator.

Related Service Information Under 1 CFR Part 51

The FAA reviewed GE Aviation Czech Alert Service Bulletin (ASB)
ASB-M601F-72-10-00-0056 [02], ASB-M601D-72-10-00-0072 [02], ASB-M601E-
72-10-00-0103 [02], and ASB-M601Z-72-10-00-0056 [02] (single document;
formatted as service bulletin identifier [revision number]), dated May
31, 2021. This service information specifies procedures for calculating
the accumulated life of certain propeller shafts and also specifies
procedures for replacing certain propeller shafts. 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 14 engines installed on
airplanes of U.S. registry. The FAA estimates that 7 M601D-11 and 7
M601E-11 model turboprop engines installed on airplanes of U.S.
registry require calculation of the time since new (TSN) of the
propeller shaft and removal and replacement of the propeller shaft. The
FAA estimates that zero M601E-11A, M601E-11AS, M601E-11S, and M601F
model turboprop engines installed on airplanes of U.S. registry require
replacement of the propeller shaft.
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
Calculate the total TSN of the propeller shaft 1 work-hours x $85 per hour = $85
$0
$85
$1,190
Remove and replace the propeller shaft 105 work-hours x $85 per hour = $8,925
17,827
26,752
374,528

The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some 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.

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: