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Federal Register / Vol. 86, No. 130 / Monday, July 12, 2021 / Proposed Rules Background The FAA issued AD 20202403, Amendment 3921333 85 FR 76955, December 1, 2020, AD 20202403, which applies to Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350D, AS355E, AS355F, AS355F1, and AS355F2 helicopters with DUNLOP cyclic stick grip manufacturer part number MP/N
AC66444 with UP/DOWN switches for rescue hoist control installed. AD 2020
2403 requires accomplishing a ground test of the UP/DOWN switches of DUNLOP cyclic stick grip for proper function before each hoist operation. If there is any uncommanded hoist action, AD 20202403 requires removing the DUNLOP cyclic stick grip from service.
If DUNLOP cyclic stick grip MP/N
AC66444 is installed, before the next operation, AD 20202403 also requires installing a placard and revising the existing RFM for your helicopter to prohibit the use of the UP/DOWN
switches of the DUNLOP cyclic stick grip. Alternatively, AD 20202403
allows removing DUNLOP cyclic stick grip MP/N AC66444, however before the DUNLOP cyclic stick grip is re-installed, AD 20202403 requires accomplishing a ground test of the UP/DOWN switches and installing the placard and revising the existing RFM for your helicopter.
AD 20202403 also prohibits installing an affected DUNLOP cyclic stick grip unless the ground testing of the UP/
DOWN switches has been accomplished, the placard has been installed, and the existing RFM for your helicopter has been revised. The FAA
issued AD 20202403 to prevent an inadvertent activation of the rescue hoist cable cutter and consequent detachment of an external load or person from the helicopter hoist. This unsafe condition could result in personal injury or injury to persons on the ground.

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Actions Since AD 20202403 Was Issued Since the FAA issued AD 202024
03, Airbus Helicopters developed a modification MOD MC20096 and issued service information that provides instructions for modifying the electrical wiring of the hoist control on DUNLOP
cyclic stick grips.
EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20210023, dated January 19, 2021 EASA AD
20210023 to correct an unsafe condition for Airbus Helicopters Model AS 350 and AS 355 helicopters.
This proposed AD was prompted by Airbus Helicopters developing MOD

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MC20096 and Airbus Helicopters issuing service information for performing this modification on the DUNLOP cyclic stick. The FAA is proposing this AD to address inadvertent activation of the rescue hoist cable cutter function and consequent detachment of an external load or person from the helicopter hoist, possibly resulting in personal injury, or injury to persons on the ground. See EASA AD 20210023 for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20210023 specifies procedures for installing the placard and revising the Flight Manual to prohibit the use of the UP/DOWN
switches of the DUNLOP cyclic stick MP/N AC66444. EASA AD 20210023
also specifies procedures for modifying the electrical wiring of the DUNLOP
cyclic stick and removing both the placard and RFM amendment previously installed.
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 the aviation authority of another 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 proposing 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.
Explanation of Retained Requirements Although this proposed AD does not explicitly restate the requirements of AD
20202403, this proposed AD would retain certain requirements of AD 2020
2403. Those requirements are referenced in EASA AD 20210023, which, in turn, is referenced in paragraph g of this proposed AD.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in EASA AD 20210023 described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this proposed AD and except as discussed under Differences
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Between this Proposed AD and EASA
AD 20210023.
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 20210023
will be incorporated by reference in the FAA final rule. This proposed AD
would, therefore, require compliance with EASA AD 20210023 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 2021
0023 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
20210023. Service information specified in EASA AD 20210023 that is required for compliance with it will be available at https www.regulations.gov by searching for and locating Docket No.
FAA20210559 after the FAA final rule is published.
Differences Between This Proposed AD
and EASA AD 20210023
For helicopters with DUNLOP cyclic stick grip MP/N AC66444 with UP/
DOWN switches for rescue hoist control installed, this proposed AD would require accomplishing a ground test of the UP/DOWN switches for proper function before each hoist operation, whereas the EASA AD does not. Where EASA AD 20210023 refers to its effective date or the effective date of EASA Emergency AD 20200217E, dated October 8, 2020, this proposed AD
would require using the effective date of this AD. Where the service information referenced in EASA AD 20210023
specifies work must be performed on the helicopter by the operator, this proposed AD would require that the work be accomplished by a mechanic that meets the requirements of 14 CFR
part 65 subpart D. Where the service information referenced in EASA AD
20210023 specifies to discard certain placards and Flight Manual pages that were required by EASA AD 20200217
E, this proposed AD would require
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