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Federal Register / Vol. 86, No. 157 / Wednesday, August 18, 2021 / Proposed Rules
which could cause damage to equipment, and result in loss of electrical power and a possible in-flight fire.
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 Boeing Alert Service Bulletin MD1124A204, Revision 2, dated April 14, 2021. For certain airplanes, this service information describes procedures for doing a general visual inspection of the right observer station upper main circuit breaker panel and wiring for missing installation of sleeving, grommets, and spacers; doing an inspection of the right observer station upper main circuit
breaker panel to determine if bracket part number SR1124004611 is installed; and applicable on-condition actions. On-condition actions include repairing or replacing damaged wires, installing sleeves and routing wires, trimming and re-identifying the bracket, and replacing any missing grommets or spacers.
For certain other airplanes, this service information describes procedures for doing a general visual inspection of wire assemblies ABS9110
and ABS9115 for any damage i.e., wire chafing, arcing, modifying the observer station upper main circuit breaker panel, and applicable on-condition actions. On-condition actions include repairing or replacing damaged wires.
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.

Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions identified as RC required for compliance in the Accomplishment Instructions of Boeing Alert Service Bulletin MD1124A204, Revision 2, dated April 14, 2021, already described, except for any differences identified as exceptions in the regulatory text of this proposed AD.
For information on the procedures and compliance times, see this service information at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0564.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 118
airplanes of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Action
Labor cost
Inspections

Up to 17 work-hours $85 per hour = Up to $1,445

The FAA estimates the following costs to do any necessary actions that
Parts cost
Cost on U.S.
operators
Cost per product $0

would be required based on the results of the proposed inspection. The FAA

Up to $1,445

Up to $170,510.

has no way of determining the number of aircraft that might need these actions:

ON-CONDITION COSTS
Action
Labor cost
Parts cost
Replacement, installation and trimming

Up to 3 work-hours $85 per hour = Up to $255

$428

Cost per product Up to $683.

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The FAA has received no definitive data on which to base the cost estimates for the on-condition repairs specified in this proposed AD.

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this proposed AD may be covered under warranty, thereby reducing the cost impact on affected operators.

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.

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.

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
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 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
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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List of Subjects in 14 CFR Part 39

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.

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