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Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Rules and Regulations
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.
FAA20210333.
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
0333; 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 Safety Branch, Compliance &
Airworthiness Division, FAA, 950
LEnfant Plaza N SW, Washington, DC
20024; phone: 202 2679167; email:
hal.jensen@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The EASA, which is the Technical Agent for the Member States of the
European Union, has issued EASA AD
20200021, dated February 6, 2020
EASA AD 20200021 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus Helicopters Model AS332C, AS332C1, AS332L, and AS332L1 helicopters. Although EASA
AD 20200021 applies to all Model AS332C, AS332C1, AS332L, and AS332L1 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 by adding an AD that would apply to certain Airbus Helicopters Model AS332C, AS332C1, AS332L, and AS332L1 helicopters. The NPRM
published in the Federal Register on April 22, 2021 86 FR 21238. The NPRM was prompted by a report of a yaw control failure that was the result of the disconnection of the TRH pitch control rod from the tail rotor servocontrol, which resulted from a seized TRH bearing. The TRH bearing had grease dissolving after contamination by leaked hydraulic fluid from the tail rotor servo-control that came through the TRH assembly boot. The NPRM
proposed to require repetitive inspections for hydraulic leaks, corrective actions if necessary, and an optional modification which constitutes terminating action, as specified in an EASA AD.
The FAA is issuing this AD to address seized TRH bearings, which could reduce the effectiveness of the pitch control of the tail rotor system, possibly resulting in reduced yaw control of the helicopter. See the MCAI 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.
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 20200021 describes procedures for repetitive inspections for hydraulic leaks, corrective actions if necessary i.e., replacement of the pitch control rod bearing of the affected TRH
assembly, and an optional modification i.e., installation of a TRH assembly having certain part numbers which constitutes terminating action. 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 10 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
1 work-hour $85 per hour = $85 per inspection cycle

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
Cost per product $0

$85 per inspection cycle

the results of any required actions. The FAA has no way of determining the
Cost on U.S. operators $850 per inspection cycle.

number of helicopters that might need these on-condition actions:

khammond on DSKJM1Z7X2PROD with RULES

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Cost per product
6 work-hours $85 per hour = $510

$509

$1,019

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