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Federal Register / Vol. 86, No. 163 / Thursday, August 26, 2021 / Rules and Regulations
of certain publications listed in this AD
as of July 15, 2021 86 FR 30759, June 10, 2021.
The FAA must receive comments on this AD by October 12, 2021.
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: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 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 incorporated by reference IBR in this AD, contact the 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 this material on the EASA website at https ad.easa.europa.eu. For Airbus Helicopters service information identified in this final rule, contact Airbus Helicopters, 2701 North Forum Drive, Grand Prairie, TX 75052;
telephone 972 6410000 or 800 232
0323; fax 972 6413775; or at https
www.airbus.com/helicopters/services/
technical-support.html. You may view this material at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110. Service information also available in the AD
docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0717.

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Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0717; 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 AD, any comments received, and other information. The street address for Docket Operations is listed above.
Comments will be available in the AD
docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT:
Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance
VerDate Sep<11>2014

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& Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY
11590; telephone 516 2287330; email andrea.jimenez@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued AD 20211103, Amendment 3921565 86 FR 30759, June 10, 2021 AD 20211103, for certain Airbus Helicopters Model EC
155B, EC155B1, SA365N, SA365N1, AS365N2, and AS 365 N3 helicopters.
AD 20211103 required inspecting and if necessary, replacing the MGB front fitting. AD 20211103 also required modifying the MGB front fitting. AD
20211103 was prompted by EASA AD
20190008, dated January 22, 2019
EASA AD 20190008, issued by EASA, which is the Technical Agent for the Member States of the European Union, 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. EASA
advises of 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.
This condition, if not addressed, could result in damage to the helicopter, loss of helicopter control, and possible injury to persons on the ground.
Accordingly, EASA AD 20190008
requires inspecting the MGB front fittings and 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.
Accomplishing the modification constitutes a terminating action for the required inspection.
Actions Since AD 20211103 Was Issued Since AD 20211103 was issued, the FAA discovered that paragraph h Exceptions to EASA AD 20190008 of AD 20211103, inadvertently omitted service information required for Airbus Helicopters Model EC 155B and EC155B1 helicopters. This AD corrects subparagraph h8 to add Airbus Helicopters Alert Service Bulletin ASB
No. 53A035, Revision 0, dated March 13, 2017, and ASB No. 53A035, Revision 1, dated December 20, 2018.
This AD also updates the U.S. fleet size in the Costs of Compliance section.
FAAs Determination These products have been approved by the aviation authority of another
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country, and are approved for operation in the United States. Pursuant to the bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the EASA AD referenced above. The FAA is issuing this AD after evaluating all the relevant information and determining the unsafe condition described previously is likely to exist or develop in other products of these same type designs.
Related IBR Material Under 1 CFR Part 51
This AD requires EASA AD 2019
0008, dated January 22, 2019, which the Director of the Federal Register approved for incorporation by reference as of July 15, 2021 86 FR 30759, June 10, 2021. EASA AD 20190008 requires inspecting the MGB front fittings within 110 flight hours after April 14, 2017 the 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.
This AD also requires 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. The Director of the Federal Register also approved this service information for incorporation by reference as of July 15, 2021 86 FR
30759, June 10, 2021. 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.
AD Requirements This AD requires accomplishing the actions specified in EASA AD 2019
0008 and the service information already described, except for any differences identified as exceptions in the regulatory text of this AD.

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