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Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules be placed in the public docket for this rulemaking.
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20180203, dated September 12, 2018 EASA AD
20180203, to correct an unsafe condition for Leonardo S.p.A., formerly Finmeccanica S.p.A. and AgustaWestland S.p.A., Model AW169
helicopters, all serial numbers equipped with pilot collective stick assemblies having part number P/N
6F6711A07832 or P/N 6F6711A07831.
This proposed AD was prompted by reports of in-flight pilot collective stick oscillation. Based on the investigation results, it was determined that this was likely due to an incorrect adjustment on the collective stick fixed friction during helicopter assembly, or during a maintenance action. Incorrect adjustment of the collective friction of the flight control system could lead to a reduction in the safety margins of controllability of an affected helicopter.
To address this issue, EASA issued AD
20170137, dated August 1, 2017, to require a one-time measurement of the collective stick fixed friction value.
After that EASA AD was issued an additional event was reported involving a helicopter that was not affected by EASA AD 20170137. EASA AD 2018
0203 supersedes EASA AD 20170137.
The FAA is proposing this AD to address incorrect adjustment of the pilot collective stick fixed friction. The unsafe condition, if not addressed, could result in reduced controllability of the helicopter, and subsequent damage to the helicopter and injury to occupants. See EASA AD 20180203 for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20180203 requires a onetime measurement of the friction of the
pilot collective stick assembly to verify that it is within the allowable range specified in the service information collective up and collective down directions 9.00/18.00N Newton or 2.02/4.05 lbf pound force and, depending on the findings, accomplishment of the corrective action. The corrective action is making an adjustment to the pilot collective stick assembly to restore the acceptable level of friction. EASA AD 20180203
also specifies that after installation of an affected part, or following maintenance of an affected part that involves removal from the helicopter and re-installation, before the next flight after the part installation, the collective fixed friction must be measured and, depending on the findings, the corrective action must be accomplished.
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.
FAAs Determination and Requirements of This Proposed AD
These helicopters have been approved by EASA and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA about the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or develop on other helicopters of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in EASA AD 20180203, described 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 developed a process to use certain civil aviation authority CAA ADs as the primary source of information for compliance with requirements for corresponding FAA
ADs. The FAA has been coordinating this process with manufacturers and CAAs. As a result, EASA AD 20180203
will be incorporated by reference in the FAA final rule. This proposed AD
would, therefore, require compliance with EASA AD 20180203 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 EASA AD 2018
0203 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 EASA AD
20180203. Service information specified in EASA AD 20180203 that is required for compliance with it will be available at https www.regulations.gov by searching for and locating Docket No.
FAA20210578 after the FAA final rule is published.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 6
helicopters of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

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ESTIMATED COSTS
Action
Labor cost
Functional checkfriction measurement

2 work-hours $85 per hour = $170

The FAA estimates the following costs to do any necessary adjustment
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that would be required based on the results of the proposed inspection. The
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Cost per product
Parts cost $0

$170

Cost on U.S.
operators $1,020

agency has no way of determining the number of helicopters that might need this adjustment:

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