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Federal Register / Vol. 86, No. 136 / Tuesday, July 20, 2021 / Rules and Regulations The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of August 24, 2021.
ADDRESSES: For DGAC material incorporated by reference IBR in this AD, contact the European Union Aviation Safety Agency 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 DGAC material on the EASA
website at https ad.easa.europa.eu.
For American Eurocopter material, contact Airbus Helicopters, 2701 N
Forum Drive, Grand Prairie, TX 75052;
telephone 9726410000 or 800232
0323; fax 9726413775; or at https
www.airbus.com/helicopters/services/
technical-support.html. You may view the DGAC and American Eurocopter material at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. Service information that is incorporated by reference is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0175.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210175; 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 DGAC ADs, any comments received, and other information. The street address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Blaine Williams, Aerospace Engineer, Cabin Safety & Environmental Systems Section, Los Angeles ACO Branch, Compliance & Airworthiness Division, 3960 Paramount Blvd., Lakewood, CA
90712; telephone 5626275371; email blaine.williams@faa.gov.
SUPPLEMENTARY INFORMATION:

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Background The DGAC, which was the Technical Agent for France, issued DGAC AD
2001061053A, dated February 21,
VerDate Sep<11>2014

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2001 DGAC AD 2001061053A for certain Model SA365N, SA365N1, AS365N2, and AS 365 N3 helicopters;
and DGAC AD 2001283025A, dated July 11, 2001 DGAC AD 2001283
025A for all Model SA366G1
helicopters also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for those helicopters.
The FAA issued a second supplemental notice of proposed rulemaking SNPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Airbus Helicopters type certificate previously held by Eurocopter France Model SA365N, SA365N1, AS365N2, AS 365 N3, and SA366G1 helicopters. The second SNPRM published in the Federal Register on May 7, 2021 86 FR 24556.
The second SNPRM proposed to require inspecting the frame for the correct edge distance of the four attachment holes of the stretcher support and for a crack, and repairing the frame, if necessary, and installation of a reinforcement plate reinforcing angle on the frame, as specified in DGAC AD 2001061
053A and DGAC AD 2001283
025A. The second SNPRM also included references to an engineering report that lists approved U.S.
alternative fasteners and materials that may be used in any required repairs.
The second SNPRM was issued because a significant amount of time elapsed since the first SNPRM was published.
The FAA is issuing this AD to address failure of the 9-degree frame due to a crack at the stretcher support attachment holes, which could result in loss of a passenger door, damage to the rotor system, and subsequent loss of control of the helicopter. See the MCAI
for additional background information.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the second SNPRM or on the determination of the costs.
Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule as proposed, except for minor editorial changes. The FAA has determined that these minor changes:

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Are consistent with the intent that was proposed in the second SNPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the second SNPRM.
Related Service Information Under 1
CFR Part 51
DGAC AD 2001061053A and DGAC AD 2001283025A describe procedures for measuring the edge distance of the webs at the four attachment holes of the stretcher support on the left and right sides of the 9-degree frame, and additional actions depending on the findings. The additional actions include repetitively inspecting the frame for cracking, repair if necessary, and installation of a reinforcement plate reinforcing angle on the frame. These documents are distinct since they refer to different helicopter models.
American Eurocopter Engineering Report No. AEC/03RE005, Addendum ASB 53.00.42 and 53.00.43
AS365, dated January 29, 2003, specifies U.S. and European rivet equivalent part numbers, U.S. rivet part numbers with acceptable substitute materials with greater strength properties, and 5 rivet, 6 rivet, and pin Hi-lok alternatives.
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.
Differences Between This AD and the MCAI
The FAA has determined that acceptable U.S. alternatives to the fasteners and materials needed to perform repairs or modifications are listed in American Eurocopter Engineering Report No. AEC/03RE005
Addendum ASB 53.00.42 and 53.00.043 AS365, dated January 29, 2003.
Where DGAC AD 2001061053A
exempts helicopters that were delivered after January 31, 2001, from the applicability, this AD does not exempt those helicopters.
Costs of Compliance The FAA estimates that this AD
affects 31 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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