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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Rules and Regulations
FOR FURTHER INFORMATION CONTACT:

Blaine Williams, Aerospace Engineer, Los Angeles ACO Branch, Compliance &
Airworthiness Division, 3960
Paramount Blvd., Lakewood, California 90712; telephone 562 6275371; email blaine.williams@faa.gov.
SUPPLEMENTARY INFORMATION:
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20190008, dated January 22, 2019 EASA AD
20190008 to correct an unsafe condition for certain Airbus Helicopters AH, formerly Eurocopter, Eurocopter France, Aerospatiale, Model EC 155 B, EC 155 B1, SA 365 N, SA 365 N1, AS
365 N2, and AS 365 N3 helicopters.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Model EC 155 B, EC155B1, SA365N, SA365N1, AS
365N2, and AS 365 N3 helicopters. The NPRM published in the Federal Register on March 5, 2021 86 FR
12862. The NPRM was prompted by reports of an in-flight loss of engine and MGB cowlings. Subsequent investigations revealed that the MGB
cowling attachment fittings failed because of mounting stress in the MGB
front fitting and air intake bulkhead.
The NPRM proposed to require inspecting and if necessary, replacing the MGB front fitting. The NPRM also proposed to require modifying the MGB
front fitting, as specified in an EASA
AD.
The FAA is issuing this AD to address failure of an MGB front fitting and subsequent detachment of the MGB or engine cowlings. See EASA AD 2019
0008 for additional background information.
Discussion of Final Airworthiness Directive 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.

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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 20190008 requires inspecting the MGB front fittings within 110 flight hours after April 14, 2017 the
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effective date of EASA AD 20170055, dated March 31, 2017. If there is a discrepancy, the EASA AD requires applicable corrective actions before next flight. EASA AD 20190008 also requires modification of the MGB fixed cowling attachments within 660 flight hours or 23 months, whichever occurs first, after the effective date described in EASA AD 20190008. Accomplishing the modification constitutes a terminating action for the required inspection.
The FAA also reviewed Airbus Helicopters Alert Service Bulletin ASB
No. AS36553.00.62 and ASB No.
EC15553A038, each Revision 0 and dated December 20, 2018 ASB AS365
53.00.62 and ASB EC15553A038. ASB
AS36553.00.62 applies to Model AS365-series helicopters. ASB EC155
53A038 applies to Model EC155-series helicopters. This service information specifies replacing the front bracket, inspecting for stress of the MGB fixed cowlings on the radiator bulkhead, and installing an additional locking system.
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.
Costs of Compliance The FAA estimates that this AD
affects 19 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 the MGB front fittings takes about 2 work-hours for an estimated cost of $170 per helicopter and $3,230 for the U.S. fleet. If required, replacing an MGB front fitting takes about 2 work-hours and parts cost about $590 for an estimated total cost of $760
per fitting. Other repairs will take up to 8 work-hours excluding drying time and parts will cost a minimal amount for an estimated cost of up to $680 per helicopter.
Modifying the MGB fixed cowling attachments takes about 5 work-hours and parts cost about $630 for an estimated cost of $1,055 per helicopter and $20,045 for the U.S. fleet.
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.

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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 that 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 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:

20211103 Airbus Helicopters:
Amendment 3921565; Docket No.
FAA20201183; Project Identifier 2019SW008AD.
a Effective Date This airworthiness directive AD is effective July 15, 2021.

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