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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Rules and Regulations the helicopter. See EASA AD 20180061
for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.
Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule as proposed.
Related Service Information Under 1
CFR Part 51
EASA AD 20180061 specifies compliance intervals to repetitively inspect certain M/R blades, with a blade sweep angle of 1 degree, for cracks and resin chippings in the area of the greater thimble radius and corrective actions, if there is a crack or anomaly. EASA AD
20180061 also specifies compliance intervals to repetitively inspect certain M/R blades, with a blade sweep angle of 0 degrees, for cracks and bulging in the teflon foil in the area of the greater thimble radius and corrective actions, if there is a crack or bulge. Corrective actions include dispatching the M/R
blades to an authorized repair station, as required.
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.

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Differences Between This AD and the EASA AD
EASA AD 20180061 applies to Model MBBBK117 A1, MBBBK117
A3, MBBBK117 A4, MBBBK117 B
1, MBBBK117 B2 and MBBBK117
C1 helicopters, whereas this AD
applies to Model MBBBK 117 A1, MBBBK 117 A3, MBBBK 117 A4, MBBBK 117 B1, MBBBK 117 B2, and MBBBK 117 C1 helicopters with certain M/R blades installed instead.
The service information required by EASA AD 20180061 requires accomplishment of certain corrective action by ECD or an authorized service or repair station, whereas this AD requires performing the corrective action in accordance with FAAapproved procedures instead. EASA AD
20180061 requires revising the Aircraft Maintenance Program AMP, whereas this AD does not. EASA AD 20180061
allows a tolerance to compliance times, whereas this AD does not.

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Costs of Compliance The FAA estimates that this AD
affects 216 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates that operators may incur the following costs in order to comply with this AD.
Inspecting an M/R blade thimble area takes about 1 work-hour for an estimated cost of about $85 per M/R
blade thimble, per inspection cycle.
Repairing or replacing an M/R blade takes up to about 20 work-hours and parts cost up to about $23,100 for an estimated cost of up to $24,800 per blade.
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 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.

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Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
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:

20211109 Airbus Helicopters Deutschland GmbH: Amendment 39
21571; Docket No. FAA20210196;
Project Identifier 2018SW021AD.
a Effective Date This airworthiness directive AD is effective July 12, 2021.
b Affected ADs None c Applicability This AD applies to Airbus Helicopters Deutschland GmbH Model MBBBK 117 A
1, MBBBK 117 A3, MBBBK 117 A4, MBBBK 117 B1, MBBBK 117 B2, and MBBBK 117 C1 helicopters, certificated in any category, with an affected angle 0
parts or affected angle 1 parts installed, as identified in European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD 20180061, dated March 20, 2018 EASA AD 20180061.
d Subject Joint Aircraft System Component JASC
Code: 6200, Main Rotor System.
e Reason This AD was prompted by new test results from a composite analysis of the main rotor M/R blade loop area, which revealed that certain M/R blade thimbles require reduced inspection intervals. The FAA is issuing this AD to address composite failure of an M/R
blade, which if not addressed could result in subsequent 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 20180061.
h Exceptions to EASA AD 20180061
1 Where EASA AD 20180061 refers to its effective date, this AD requires using the effective date of this AD.
2 Where EASA AD 20180061 refers to flight hours, this AD requires using hours time-in-service TIS.
3 Where Table 1, Table 2, and Note 2 of EASA AD 20180061 specify inspection
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