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Federal Register / Vol. 86, No. 198 / Monday, October 18, 2021 / Rules and Regulations action has been accomplished by paragraph f of this AD. However, this AD also prohibits installing an affected seat on Sikorsky Model S92A
helicopters unless the main back tube assembly has been replaced following those procedures in ASB 9225026.
Additionally, not all operators are required to accomplish a manufacturers maintenance procedures. In order for procedures in service information, including procedures in alert service bulletins, to become mandatory when the FAA has determined the procedures are necessary to correct an identified unsafe condition, the FAA must issue an AD.
Request To Require Destruction and Discarding of Parts Instead of Removal From Service Sikorsky requested changing the requirement to remove certain previously-installed parts from service to destroying or discarding those parts instead because Sikorsky does not endorse removal from service.
The FAA disagrees. The FAA
appreciates that the removed main back tube assemblies, split pins, and tie down straps must not be reinstalled and that those parts may be destroyed or discarded; however, the FAA cannot mandate or enforce destruction or disposal of parts to address an unsafe condition. For the purposes of an AD, the FAA requires removal from service instead to prevent reinstallation.

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Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for a minor change in paragraph e of this AD to clarify that the FAA is issuing this AD to detect and address a main back tube that does not meet design specifications, a minor change in Note 3 to paragraph c to clarify that the marking of, SIL833
incorporated could be located adjacent to identification labels on the underside of the sitting platform assembly P/N
MBCS12215, and any other changes described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed ASB 9225026, with attachments Martin-Baker SIL 831
and Martin-Baker SIL 833. ASB 9225
026 specifies procedures for preparing the helicopter for replacing the main
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back tube assembly by following SIL
831 or SIL 833, as applicable to your seat. ASB 9225026 specifies removing existing placards, complying with the applicable SIL, reinstalling the removed placards, inspecting for foreign object debris FOD, and cleaning. MartinBaker SIL 831 for side facing utility seat supplier P/N MBCS12410AA001, and Martin-Baker SIL 833 for observer seat supplier P/N MBCS12200 and MBCS73012, specify procedures for disassembling the seat, inspecting components, replacing the main back tube assembly tube assembly, back main, and reassembling, testing, and marking the seat. SIL 831 and SIL 833
are attached to ASB 9225026.
This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.
Differences Between This AD and the Service Information ASB 9225026 specifies a compliance time of no later than March 5, 2021; whereas this AD specifies a compliance time of within 125 hours time-in-service TIS or six months after the effective date of this AD, whichever occurs first. ASB 9225026 specifies inspecting for FOD and cleaning;
whereas this AD does not. SIL 831 and SIL 833 specify destroying and disposing discrepant main back tube assemblies and discarding removed split pins and tie down straps; whereas this AD requires removing those parts from service instead. The service information specifies recording compliance; whereas this AD does not.
Costs of Compliance The FAA estimates that this AD
affects 9 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates the following costs to comply with this AD.
Replacing a main back tube assembly takes about 2 work-hours and parts cost about $11,217, for an estimated cost of about $11,387 per seat. Each helicopter could have up to 19 affected seats, which takes up to about 38 work-hours and parts cost up to about $213,123, for an estimated cost of up to about $216,353 per helicopter and $1,947,177
for the U.S. fleet.
The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.

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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.
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 necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

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