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2021-13-08 SAFRAN HELICOPTER ENGINES, S.A. (TYPE CERTIFICATE PREVIOUSLY HELD BY TURBOMECA, S.A.): Amendment 39-21613; Docket No. FAA-2021-0100; Project Identifier MCAI-2020-00309-E.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective August 19, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to  Safran Helicopter Engines, S.A. (Type Certificate
    previously  held  by  Turbomeca, S.A.)  Arriel 2C and Arriel 2S1 model
    turboshaft engines.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 7321, Fuel Control/Turbine
    Engines.

(e) UNSAFE CONDITION

    This  AD  was  prompted  by reports  of  error  messages  of the  full
    authority digital engine control (FADEC) B digital engine control unit
    (DECU), caused by blistering of the varnish on the DECU circuit board.
    The FAA is issuing this AD to prevent failure of the FADEC B DECU. The
    unsafe condition,  if not  addressed, could  result in  loss of engine
    thrust control and reduced control of the helicopter.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    For affected engines having an installed FADEC B DECU  with  a  serial
    number  (S/N)  identified  in Safran Helicopter Engines Note Technique
    AA187866,  Version A,  dated 18 Octobre 2019  [Octobre 18, 2019]  (the
    Note Technique),  within 1,400 engine operating hours after the effec-
    tive date of this AD,  replace  the FADEC B DECU  with a part eligible
    for installation.

(h) INSTALLATION PROHIBITION

    After the effective date of this AD,  do not install onto any engine a
    FADEC B DECU having an S/N listed in the Note Technique.

(i) DEFINITION

    For the purpose of this AD,  a  part  eligible  for  installation is a
    FADEC B DECU that does not have an S/N listed in the Note Technique.

(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 ECO Branch, 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 2020-0046,
    dated March 4, 2020, 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-2021-0100.

(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) Safran Helicopter Engines Note Technique AA187866, Version A, dated 18
    Octobre 2019 [October 18, 2019].

(ii) [Reserved]

(3) For Safran Helicopter Engines, S.A.  service information identified in
    this AD,  contact Safran Helicopter Engines, S.A.,  Avenue du 1er Mai,
    40220 Tarnos, France; phone: +33 (0) 5 59 74 40 00.

(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 July 9, 2021. Gaetano A Sciortino, Deputy Director for Strategic
Initiatives,  Compliance & Airworthiness 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-2021-0100; Project Identifier MCAI-2020-00309-E;
Amendment 39-21613; AD 2021-13-08]
RIN 2120-AA64

Airworthiness Directives; Safran Helicopter Engines, S.A. (Type
Certificate Previously Held by Turbomeca, S.A.) Turboshaft Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Safran Helicopter Engines, S.A. Arriel 2C and Arriel 2S1 model
turboshaft engines. This AD was prompted by reports of error messages
on the full authority digital engine control (FADEC) B digital engine
control unit (DECU), caused by blistering of the varnish on the DECU
circuit board. This AD requires the replacement of certain FADEC B
DECUs. The FAA is issuing this AD to address the unsafe condition on
these products.

DATES: This AD is effective August 19, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 19,
2021.

ADDRESSES: For service information identified in this final rule,
contact Safran Helicopter Engines, S.A., Avenue du 1er Mai, 40220
Tarnos, France; phone: +33 (0) 5 59 74 40 00. 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-2021-0100.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0100; 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 all Safran Helicopter
Engines, S.A. Arriel 2C and Arriel 2S1 model turboshaft engines. The
NPRM published in the Federal Register on February 26, 2021 (86 FR
11662). The NPRM was prompted by reports of error messages on the FADEC
B DECU, caused by blistering of the varnish on the DECU circuit board.
In the NPRM, the FAA proposed to require the replacement of certain
FADEC B DECUs. 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 2020-0046, dated March 4, 2020 (referred to after this
as ``the MCAI''), to address the unsafe condition on these products.
The MCAI states:

Occurrences have been reported of FADEC B DECU error messages,
which were found to be caused by blistering of the varnish on the
DECU circuit board. Subsequent investigation determined that the use
of a non-compliant primer is related to the blistering effect which,
in wet conditions, can cause malfunction of the stepper motor.
This condition, if not corrected, could lead to loss of
automatic control on both engines concurrently, possibly resulting
in reduced control of the helicopter.
To address this potentially unsafe condition, SAFRAN issued the
MSB, as defined in this [EASA] AD, to provide instructions for
identification and replacement of affected parts. For the reason
described above, this [EASA] AD requires replacement of affected
parts with serviceable parts. This [EASA] AD also prohibits (re-
installation of affected parts.

You may obtain further information by examining the MCAI in the AD
docket on at https://www.regulations.gov by searching for and locating
Docket No. FAA-2021-0100.

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. This AD is
adopted as proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Safran Helicopter Engines Note Technique AA187866,
Version A, dated 18 Octobre 2019 [October 18, 2019]. This service
information identifies the serial numbers (S/Ns) of certain FADEC B
DECUs installed on Arriel 2C and Arriel 2S1 model turboshaft 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 Safran Helicopter Engines Mandatory Service
Bulletin (MSB) No. 292 73 2872, Version A, dated October 17, 2019. This
MSB describes procedures for identifying the S/Ns of certain FADEC B
DECUs and replacing certain FADEC B DECUs on Arriel 2C and Arriel 2S1
model turboshaft engines.

Costs of Compliance

The FAA estimates that this AD affects 148 engines installed on
helicopters 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 the FADEC B DECU 1 work-hour x $85 per hour = $85
$0
$85
$12,580

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: