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Federal Register / Vol. 86, No. 235 / Friday, December 10, 2021 / Rules and Regulations
Discussion of Final Airworthiness Directive
Safety Branch, Compliance &
Airworthiness Division, FAA, 950
LEnfant Plaza N SW, Washington, DC
20024; phone: 202 2679167; email:
hal.jensen@faa.gov.
SUPPLEMENTARY INFORMATION:

specified in a European Union Aviation Safety Agency EASA AD, which is incorporated by reference. This AD was prompted by a report of broken and bent attachment bolts of the MR hub scissors assembly and a determination that additional part markings of the washer, scissor branch, and mast ring of the corresponding nut side, and repetitive inspections of those part markings, are necessary to detect any rotation. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective January 14, 2022.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of January 14, 2022.
ADDRESSES: For material incorporated by reference IBR in this AD, contact the EASA, Konrad-Adenauer-Ufer 3, 50668 Cologne, Germany; phone: +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. 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 8172225110. It is also available in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210829.
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
0829; 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, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Hal Jensen, Aerospace Engineer, Operational
70359

Comments
Background The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20210046, dated February 12, 2021
EASA AD 20210046 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus Helicopters Model EC120B helicopters. Although EASA
AD 20210046 applies to all Model EC120B helicopters, this AD applies to helicopters with an affected part installed instead.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20210421, Amendment 3921443 86 FR 17278, April 2, 2021 AD 20210421. AD
20210421 applied to certain Airbus Helicopters Model EC120B helicopters.
The NPRM published in the Federal Register on September 23, 2021 86 FR
52859. The NPRM was prompted by a report of broken and bent attachment bolts of the MR hub scissors assembly and a determination that additional part markings of the washer, scissor branch, and mast ring of the corresponding nut side, and repetitive inspections of those part markings, are necessary to detect any rotation. The NPRM proposed to continue to require the actions in AD
20210421, as specified in an EASA
AD. The NPRM also proposed to require part marking of the washer, scissor branch, and mast ring of the corresponding nut side, and repetitive inspections of the additional part markings and repair if necessary, as specified in an EASA AD.
The FAA is issuing this AD to address broken and bent attachment bolts of the MR hub scissors assembly, which could lead to detachment of a MR hub scissors attachment bolt, possibly resulting in complete loss of control of the helicopter. See the MCAI for additional background information.

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, except for minor editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
EASA AD 20210046 specifies procedures for an inspection of the attachment bolts of the MR hub scissors assembly for discrepancies discrepancies include corrosion, fretting, wear, cracking, bolt play, and bolt tightening torque and repair if necessary; part marking of the washer, scissor branch, and mast ring of the attachment bolts and corresponding nut side of the MR hub scissors assembly;
and repetitive inspections, after part marking, for discrepancies, and repair if necessary. The inspections of the attachment bolts of the MR hub assembly include checking the play and torque of the scissors attachment bolts and making sure that there are no hard spots in the scissors link hinge.
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 89 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS

jspears on DSK121TN23PROD with RULES1

Action
Labor cost
Inspection for discrepancies retained actions from AD 20210421.
Part Marking retained actions from AD
20210421.
Repetitive Inspection of Markings retained actions from AD 20210421.

VerDate Sep<11>2014

15:55 Dec 09, 2021

Jkt 256001

Parts cost
4 work-hours $85 per hour = $340.
1 work-hour $85 per hour = $85.
1 work-hour $85 per hour = $85 per inspection cycle.

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Cost per product
Cost on U.S. operators
$0

$340

$30,260.

0

$85

$7,565.

0

$85 per inspection cycle ..

$7,565 per inspection cycle.

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