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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Proposed Rules
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 the EASA AD 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 Actions and Compliance Times in the EASA AD. Service information specified in EASA AD
20170037 that is required for compliance with EASA AD 20170037
will be available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210450 after the FAA final rule is published.

khammond on DSKJM1Z7X2PROD with PROPOSALS

Differences Between This Proposed AD
and the EASA AD
EASA AD 20170037 applies to Model MBBBK117 D2 and D2m helicopters, whereas this proposed AD
would only apply to Model MBB
BK117 D2 helicopters because Model D2m is not FAA type-certificated. If the total hours TIS for an affected rotor mast nut cannot be determined, this proposed AD would require removing the rotor mast nut from service before further flight, whereas EASA AD 2017
0037 does not contain this requirement.
EASA AD 20170037 requires using a vibrograph to re-identify certain rotor mast nuts, whereas this proposed AD
would require using a vibro etch instead. EASA AD 20170037 requires replacing certain parts, whereas this proposed AD would require removing certain parts from service instead. EASA
AD 20170037 requires revising the AMP, whereas this proposed AD would not.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 30
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.
Determining the total hours TIS on an affected rotor mast nut would take about 1 work-hour for an estimated cost of $85
per helicopter and $2,550 for the U.S.
fleet.
Re-identifying a rotor mast nut would take about 1.5 work-hours for an estimated cost of $128 per rotor mast nut.
Replacing a rotor mast nut would take about 6 work-hours and parts would
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cost about $5,351 for an estimated cost of $5,861 per rotor mast nut.
Replacing a main gearbox, which includes replacing the helical gear support, would take about 42 workhours and parts would cost about $295,000 overhauled for an estimated cost of $298,570.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys 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:

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PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Airbus Helicopters Deutschland GmbH
AHD: Docket No. FAA20210450;
Project Identifier 2017SW100AD.
a Comments Due Date The FAA must receive comments by July 22, 2021.
b Affected Airworthiness Directives ADs None.
c Applicability This AD applies to Airbus Helicopters Deutschland GmbH AHD Model MBBBK
117 D2 helicopters, certificated in any category, with an affected main gearbox or affected rotor mast nut as identified in Note 1 of European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD 20170037, dated February 22, 2017 EASA AD 20170037 installed.
d Subject Joint Aircraft System Component JASC
Code: 6200, Main gearbox.
e Unsafe Condition This proposed AD was prompted by the discovery that certain parts that are approved for installation on multiple helicopter models are life limited parts when installed on Model MBBBK 117 D2 helicopters and some helicopter delivery documents excluded the life limit information. The FAA
is issuing this AD to prevent certain parts from remaining in service beyond their fatigue life. The unsafe condition, if not addressed, could result in failure of the part and loss of control of the helicopter.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Requirements Except as specified in paragraph h of this AD: Comply with all required actions and compliance times specified in, and in accordance with, EASA AD 20170037.
h Exceptions to EASA AD 20170037
1 Where EASA AD 20170037 refers to its effective date, this AD requires using the effective date of this AD.
2 Where EASA AD 20170037 refers to flight hours FH, this AD requires using hours time-in-service TIS.
3 Where paragraph 1 of EASA AD 2017
0037 requires determining the FH total hours TIS accumulated by the affected rotor mast nut since first installation on a helicopter, this AD requires removing the rotor mast nut from service before further
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