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Federal Register / Vol. 86, No. 41 / Thursday, March 4, 2021 / Proposed Rules FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Martin-Baker Special Information Leaflet SIL No.
831, dated July 10, 2019 SIL 831, for side facing utility seat supplier part number P/N MBCS12410AA001, and Martin-Baker SIL No. 833, dated July 11, 2019 SIL 833, for observer seat supplier P/N MBCS12200 and MBCS73012. This service information specifies 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 Sikorsky S92A Helicopter Alert Service Bulletin 9225026, dated March 5, 2020 ASB 9225026.
The FAA also reviewed ASB 9225
026, which specifies procedures for preparing the helicopter for replacing the main back tube assembly by following SIL 831 or SIL 833, as applicable to your seat. This service information specifies removing existing placards, complying with the applicable SIL, reinstalling the removed placards, inspecting for foreign object debris FOD, and cleaning.
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.

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Proposed AD Requirements in This NPRM
This proposed AD would require, within 125 hours time-in-service TIS
or six months after the effective date of this AD, whichever occurs first, removing certain placards, accomplishing the actions specified in SIL 831 or SIL 833 already described, and reinstalling the previously removed placards.
Differences Between This Proposed AD
and the Service Information ASB 9225026 specifies a compliance time of no later than March 5, 2021; where this proposed AD
specifies a compliance time of within 125 hours TIS or six months after the effective date of this AD, whichever occurs first. ASB 9225026 specifies inspecting for FOD and cleaning;
whereas this proposed AD does not. SIL
831 and SIL 833 specify destroying and disposing removed main back tube
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assemblies and discarding removed split pins and tie down straps; whereas this proposed AD would require removing those parts from service instead. The service information specifies recording compliance; whereas this proposed AD
does not.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 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 proposed AD.
Replacing a main back tube assembly would take about 2 work-hours and parts would cost about $11,217, for an estimated cost of about $11,387 per seat.
Each helicopter could have up to 19
affected seats, which would take up to 38 work-hours and parts would 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 proposed AD may be covered under warranty, thereby reducing the cost impact on affected operators.
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 The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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
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responsibilities among the various levels of government.
For the reasons discussed above, I
certify this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would 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 Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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:

Sikorsky Aircraft Corporation: Docket No.
FAA20210106; Project Identifier AD
202000708R.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by April 19, 2021.
b Affected ADs None.
c Applicability This AD applies to Sikorsky Aircraft Corporation Model S92A helicopters, certificated in any category, with the following installed:
1 A Martin-Baker side facing utility seat supplier part number P/N
MBCS12410AA001 with a serial number S/N identified in Table 2 of Martin-Baker Special Information Leaflet SIL No. 831, dated July 10, 2019 SIL 831, that is not marked with SIL831 incorporated; or 2 A Martin-Baker observer seat supplier P/N MBCS12200 or MBCS73012 with an S/N identified in Table 2 of Martin-Baker SIL
No. 833, dated July 11, 2019 SIL 833, that is not marked with SIL833 incorporated.
Note 1 to paragraph c: SIL 831 and SIL
833 are attached to Sikorsky S92A
Helicopter Alert Service Bulletin 9225026, dated March 5, 2020 ASB 9225026.
Note 2 to paragraph c: Section 3., the Accomplishment Instructions, Tables 1 and 2
of ASB 9225026, specify cross references
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