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Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Rules and Regulations
SA365N, SA365N1, AS365N2, and AS 365 N3 helicopters.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Model SA365N, SA
365N1, AS365N2, and AS 365 N3
helicopters. The NPRM published in the Federal Register on March 23, 2021 86
FR 15431. The NPRM was prompted by a report that damage scorch marks was found on an internal life raft installation that contained a half rescue kit.
Investigation revealed that the damage was caused by an unsuitable folding process for the life raft, which led to compression of the flashlight battery in the half rescue kit. This compression caused an electrolyte leakage, followed by a short-circuit that damaged the internal life raft. The NPRM proposed to require identifying the part number and serial number of each half rescue kit located in the internal life raft installation and, depending on the findings, inspecting the life raft for damage, inspecting the condition of the flashlight battery, testing the flashlight battery, and replacing the life raft or flashlight battery including the leak test as applicable, as specified in an EASA AD.
The FAA is issuing this AD to address leakage of the flashlight battery in a half rescue kit, which could result in damage to the internal life raft, and subsequent failure of the internal life raft to deploy for example after a ditching, which could impede or prevent safe evacuation of the occupants from 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.

Costs of Compliance Update The NPRM did not include the kit cost for the on-condition action specified in paragraph 2 of EASA AD
20160028. The FAA has received this cost data and has updated the costs of compliance accordingly.
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 changes. In the NPRM, the FAA
proposed to require actions specified in EASA AD 20160028 through incorporation by reference, except for certain differences. The FAA has obtained approval to use this process from certain manufacturers, including Airbus Helicopters; however, the FAA
has not worked with Zodiac Aerospace which has been merged into Safran Aerosystems for approval of this process. EASA AD 20160028 specifies using Zodiac Aerospace Service Bulletin SB 0256413, Revision 0, dated November 23, 2015 SB 0256413 Rev 0 or Revision 1, dated January 19, 2016
SB 0256413 Rev 1, to accomplish a certain action. In light of this, an exception has been added into this final rule to directly use SB 0256413 Rev 0 or SB 0256413 Rev 1, instead of using SB 0256413 Rev 0 or SB 025
6413 Rev 1 through incorporation by reference of EASA AD 20160028.
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 20160028 specifies identifying the part number and serial number of each half rescue kit located
in the internal life raft installation, inspecting the life raft for damage scorch marks, inspecting the condition of the flashlight battery including cracks, impacts, swelling, damage, distorted case, and the connecting wire, testing the flashlight battery turning on the flashlight, and replacing the life raft or flashlight battery including the leak test.
The FAA reviewed SB 0256413 Rev 0, which specifies procedures to visually inspect the condition of the life raft and battery, and test the battery. The FAA also reviewed SB 0256413 Rev 1, which specifies the same procedures as SB 0256413 Rev 0, except SB 025
6413 Rev 1 corrects the serial numbers identified in the effectivity.
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.
Differences Between This AD and the MCAI
Although the service information referenced in EASA AD 20160028
specifies to return damaged life rafts to the manufacturer, this AD does not include that requirement.
Where EASA AD 20160028 refers to its effective date or to January 7, 2016
the effective date of EASA AD 2015
0242, this AD requires compliance within 3 months after the effective date of this AD.
Although the service information referenced in EASA AD 20160028
specifies that trained and authorized Zodiac Aerospace personnel must do the inspection of the half rescue kit, this AD does not require that Zodiac Aerospace personnel do the inspection.
Costs of Compliance The FAA estimates that this AD
affects 30 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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

$3,000

$3,085

$92,550

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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