DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-1176; Project Identifier MCAI-2021-00755-R]
RIN 2120-AA64

Airworthiness Directives; Airbus Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Airbus Helicopters Model SA330J helicopters. This proposed
AD was prompted by a review of Model EC225LP helicopter data that
revealed potential tightening torque loss of the attachment screws of
the upper deck fittings of the three main gearbox (MGB) suspension
bars. Due to design similarities, the MGB right-hand (RH) rear fittings
and MGB RH rear fitting attachment screws on Model SA330J helicopters
could also be affected. Additional analysis confirmed that the service
life limit (life limit) (SLL) for these affected MGB RH rear fittings
needs to be reduced for helicopters on which these affected parts were
operated concurrently with metallic main rotor blades installed. This
proposed AD would require determining the damage value and SLL of each
affected MGB RH rear fitting, replacing each affected MGB RH rear
fitting with a new part, and replacing the MGB RH rear fitting
attachment screws, as specified in a European Union Aviation Safety
Agency (EASA) AD, which is proposed for incorporation by reference
(IBR). The FAA is proposing this AD to address the unsafe condition on
these products.

DATES: The FAA must receive comments on this proposed AD by February
28, 2022.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the
instructions for submitting comments.
Fax: (202) 493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For EASA material that is proposed for IBR in this AD, contact
EASA, Konrad-Adenauer-Ufer 3, 50668 Cologne, Germany; telephone +49 221
8999 000; email ADs@easa.europa.eu; internet www.easa.europa.eu. You
may find the EASA material on the EASA website at https://ad.easa.europa.eu.
You may view this material at the FAA, Office of the
Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N-321,
Fort Worth, TX 76177. For information on the availability of this
material at the FAA, call (817) 222-5110. This EASA material is also
available at https://www.regulations.gov by searching for and locating
Docket No. FAA-2021-1176.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-1176; 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 NPRM, the EASA AD,
any comments received, and other information. The street address for
Docket Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Hal Jensen, Aerospace Engineer,
Operational Safety Branch, FAA, 950 L'Enfant Plaza SW, Washington, DC
20024; telephone (202) 267-9167; email hal.jensen@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under ADDRESSES. Include ``Docket No. FAA-2021-1176; Project Identifier
MCAI-2021-00755-R'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
https://www.regulations.gov, including any personal information you
provide. The agency will also post a report summarizing each
substantive verbal contact received about this NPRM.

Confidential Business Information

CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to Hal
Jensen, Aerospace Engineer, Operational Safety Branch, FAA, 950
L'Enfant Plaza SW, Washington, DC 20024; telephone (202) 267-9167;
email hal.jensen@faa.gov. Any commentary that the FAA receives that is
not specifically designated as CBI will be placed in the public docket
for this rulemaking.

Background

EASA, which is the Technical Agent for the Member States of the
European Union, has issued EASA AD 2021-0152R1, dated July 20, 2021
(EASA AD 2021-0152R1), to correct an unsafe condition for Airbus
Helicopters (formerly Eurocopter, Eurocopter France, Aerospatiale, Sud
Aviation) Model SA 330 J helicopters, all serial numbers, which were
modified in service in accordance with the instructions of Eurocopter
France Service Bulletin (SB) No. 01.20 (part of which is the in-service
retrofit Modification (Mod) 07 40043), except those on which each
affected part (as defined in EASA AD 2021-0152R1) was replaced with a
new part (not previously installed) during embodiment of Eurocopter
France SB No. 01.20 in service.
This proposed AD was prompted by a review of Model EC225LP
helicopter in-service data that revealed potential tightening torque
loss of the attachment screws of the upper deck fittings of the three
MGB suspension bars. The FAA issued AD 2020-06-12, Amendment 39-19881
(85 FR 19077, April 6, 2020) to address the unsafe condition on Model
EC225LP helicopters). Due to design similarities, the MGB RH rear
fittings and MGB RH rear fitting attachment screws on Model SA330J
helicopters could also be affected. Additional analysis confirmed that
the SLL for these affected MGB RH rear fittings needs to be reduced for
helicopters on which these affected parts were operated concurrently
with metallic main rotor blades (pre-Airbus Helicopters Modification 07
40043) installed. Airbus Helicopters Modification 07 40043 introduced
the installation of composite main rotor blades.
The FAA is proposing this AD to address tightening torque loss of
the attachment screws of the upper deck fittings of the three MGB
suspension bars. The unsafe condition, if not addressed, could result
in structural failure of the MGB RH rear fittings and MGB RH rear
fitting attachment screws, resulting in detachment of the MGB
suspension bars and consequent loss of control of the helicopter. See
EASA AD 2021-0152R1 for additional background information.

Related Service Information Under 1 CFR Part 51

EASA AD 2021-0152R1 requires determining the damage value of each
affected MGB RH rear fitting by calculating the damage caused during
the time each affected part was operated concurrently with metallic
main rotor blades installed on the helicopter, calculating the SLL for
each affected MGB RH rear fitting, and eventually replacing each
affected MGB RH rear fitting and the MGB RH rear fitting attachment
screws with new parts.
This material 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.

FAA's Determination

These helicopters have been approved by EASA and are approved for
operation in the United States. Pursuant to the FAA's bilateral
agreement with the European Union, EASA has notified the FAA about the
unsafe condition described in its AD. The FAA is proposing this AD
after evaluating all known relevant information and determining that
the unsafe condition described previously is likely to exist or develop
on other helicopters of the same type design.

Proposed AD Requirements in This NPRM

This proposed AD would require accomplishing the actions specified
in EASA AD 2021-0152R1, described previously, as incorporated by
reference, except for any differences identified as exceptions in the regulatory
text of this proposed AD.

Explanation of Required Compliance Information

In the FAA's ongoing efforts to improve the efficiency of the AD
process, the FAA developed a process to use some civil aviation
authority (CAA) ADs as the primary source of information for compliance
with requirements for corresponding FAA ADs. The FAA has been
coordinating this process with manufacturers and CAAs. As a result, the
FAA proposes to incorporate EASA AD 2021-0152R1 by reference in the FAA
final rule. This proposed AD would, therefore, require compliance with
EASA AD 2021-0152R1 in its entirety through that incorporation, except
for any differences identified as exceptions in the regulatory text of
this proposed AD. Using common terms that are the same as the heading
of a particular section in EASA AD 2021-0152R1 does not mean that
operators need comply only with that section. For example, where the AD
requirement refers to ``all required actions and compliance times,''
compliance with this AD requirement is not limited to the section
titled ``Required Action(s) and Compliance Time(s)'' in EASA AD 2021-
0152R1. Service information referenced in EASA AD 2021-0152R1 for
compliance will be available at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-1176 after the FAA final
rule is published.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 15 helicopters of U.S. Registry. Labor rates are estimated at
$85 per work-hour. Based on these numbers, the FAA estimates the
following costs to comply with this proposed AD.

Estimated Costs

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

The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would 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 proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 Proposed Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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: