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Federal Register / Vol. 86, No. 103 / Tuesday, June 1, 2021 / Proposed Rules Background The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20200282, dated December 17, 2020
EASA AD 20200282 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for Airbus Helicopters Deutschland GmbH Model EC135 P1, EC135 P2, EC135 P2+, EC135 P3, EC135 T1, EC135
T2, EC135 T2+, EC135 T3, EC635 P2+, EC635 P3, EC635 T1, EC635 T2+ and EC635 T3 helicopters, all variants, all serial numbers. Model EC635 P2+, EC635 P3, EC635 T1, EC635 T2+, and EC635 T3 helicopters are not certificated by the FAA and are not included on the U.S. type certificate data sheet, except where the U.S. type certificate data sheet explains that the Model EC635T2+ helicopter having serial number 0858 was converted from Model EC635T2+ to Model EC135T2+.
This proposed AD, therefore, does not include Model EC635 P2+, EC635 P3, EC635 T1, EC635 T2+, and EC635 T3
helicopters in the applicability.
Furthermore, although EASA AD
20200282 applies to all Model EC135
P1, EC135 P2, EC135 P2+, EC135 P3, EC135 T1, EC135 T2, EC135 T2+, EC135
T3 helicopters, this proposed AD would apply to helicopters with an affected part installed instead.
This proposed AD was prompted by a report that during an investigation related to an accident on an Airbus Helicopters Model EC130B helicopter, geometrical non-conformities were observed in the TRB root section. EASA
issued AD 20200187, dated August 21, 2020, to address this issue on Model EC130B and EC130T2 helicopters and the FAA issued a corresponding proposed AD, Docket No. FAA2021
0145, Project Identifier MCAI2020
01212R 86 FR 14290, March 15, 2021.
The Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, and EC135T3

helicopters have a similar design and production requirements to the affected Model EC 130B helicopter, and an inspection of the affected parts has detected geometrical non-conformities in some instances. The FAA is proposing this AD to address geometrical non-conformities in the TRB root section, which could lead to crack initiation and consequent blade failure, resulting in loss of control of the helicopter. See the MCAI for additional background information.
FAAs Determination These helicopters have been approved by the aviation authority of another country, and is 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 MCAI referenced above. The FAA is proposing this AD
after evaluating all the relevant information and determining the unsafe condition described previously is likely to exist or develop in other helicopters of these same type designs.
Related Service Information Under 1
CFR Part 51
EASA AD 20200282 requires a onetime inspection dimensional check to verify TRB conformity, and, depending on findings, replacement of each affected part classified as Category B
non-compliant TRB assembly. EASA
AD 20200282 also prohibits rework, repair or modification of affected parts in the critical section affected area of the TRB assembly root.
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.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in EASA AD 20200282, described
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previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this proposed AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20200282 will be incorporated by reference in the FAA final rule. This proposed AD would, therefore, require compliance with EASA AD 20200282
in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this proposed AD.
Using common terms that are the same as the heading of a particular section in the EASA AD does not mean that operators need comply only with that section. For example, where the AD
requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in the EASA AD. Service information specified in EASA AD
20200282 that is required for compliance with EASA AD 20200282
will be available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210380 after the FAA final rule is Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 341
helicopters of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

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ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
4 work-hours $85 per hour = $340

$0

$340

$115,940

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
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the results of any required actions. The FAA has no way of determining the
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number of helicopters that might need these on-condition actions:

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