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Federal Register / Vol. 86, No. 96 / Thursday, May 20, 2021 / Rules and Regulations 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.
FAA20210143.
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
0143; 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:
Blaine Williams, Aviation Safety Engineer, Los Angeles ACO Branch, 3960 Paramount Boulevard, Lakewood, CA 90712 4137; telephone 562627
5371; email blaine.williams@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20190024, dated February 4, 2019
EASA AD 20190024 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Airbus Helicopters Deutschland GmbH Model BO105A, BO105C, BO105D, BO105S, and BO
105LS A3 helicopters. Model BO105D
helicopters are not certificated by the FAA and are not included on the U.S.
type certificate data sheet; this AD
therefore does not include those helicopters in the applicability.
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 Deutschland GmbH Model BO105A, BO105C, BO105S, and BO105LS A
3 helicopters. The NPRM published in the Federal Register on March 12, 2021
86 FR 14023. The NPRM was prompted by the FAAs determination that aging of the elastomeric material in a tension TT-strap could affect the structural characteristics of the TTstrap. The NPRM proposed to require replacement of certain TT-straps with serviceable parts and implementation of a new storage life limit for TT-straps, as specified in an EASA AD.
The FAA is issuing this AD to address aging of the elastomeric material in a TT-strap, which could lead to premature failure of a TT-strap, resulting in loss of 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 20190024 specifies procedures for replacing certain TTstraps with serviceable parts and
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requires a storage life limit for TTstraps. 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 EASA AD 20190024 does not specify a life limit for the Lord TTStraps part number P/N J173221 and P/N 11714111, this AD does specify a life limit for those parts.
Where EASA AD 20190024 specifies that installation of a Lord TT-Strap is allowed provided the first flight of that helicopter after that installation is accomplished before the storage life of that Lord TT-Strap exceeds 5 years, for this AD, the installation of a Lord TTStrap is allowed provided the first flight of that helicopter after that installation is accomplished before 5 years since the TT-straps date of manufacture.
Where EASA AD 20190024 defines serviceable part as a Lord TT-Strap having a storage life not exceeding 5
years, for this AD, a serviceable part is Lord TT-straps P/N J173221 and P/N
11714111 having less than 5 years since that TT-straps date of manufacture.
Where EASA AD 20190024 specifies that the cure date of a TT-Strap can be determined using the information provided in the applicable service information specified in EASA AD
20190024, or contacting Airbus Helicopters for applicable instructions, for this AD, the option of contacting Airbus Helicopters is not required.
Costs of Compliance The FAA estimates that this AD
affects 61 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
Cost per product
4 work-hours $85 per hour = $340

Up to $4,800

Up to $5,140

According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators. The FAA does not control warranty coverage for affected operators.
As a result, the FAA has included all known costs in the cost estimate.

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Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.

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Cost on U.S.
operators Up to $313,540.

The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds
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