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Federal Register / Vol. 86, No. 195 / Wednesday, October 13, 2021 / Rules and Regulations
the flightcrew had shut down the engine for taxi back to the gate out of prudence after the CDC 4 AC 2 FEED 1 circuit breaker tripped. The FAA has not changed this AD in this regard.
Request To Specify Actions for Preventing Water Ingress Delta Air Lines requested that the FAA consider providing interim guidance on how or what to inspect if water is discovered in the forward avionics bay. Delta Air Lines stated that it is concerned that Airbus Canada has not provided operators any guidance for addressing water found in the galley area. Delta Air Lines also stated that the Airbus Canadas only guidance offered to operators are the recommendations in Airbus Canada Limited Partnership All Operator Message AOM CSAOM53
000002: Make sure the drain lines are free of dirt and other obstructions so that fluids drain freely, and Where possible, avoid leaving Passenger and Service doors open during periods of heavy rain, and eliminate large accumulations of water or other fluids in the Forward Fuselage as expeditiously as possible.
The FAA discussed this concern with TCCA and it was discovered that the
Airbus Canada Limited Partnership Model BD5001A10/-1A11 Aircraft Maintenance Publication AMP
contains an inspection for liquid spillage in the galley area of the aircraft.
This special inspection, Airbus Canada Limited Partnership Data Module Code DMC BD500AJ05511201AAA
284AA, describes procedures for a general visual inspection in the galley area, and a supplemental detailed visual inspection if it is discovered that liquid has passed beyond the galley into other areas. The FAA suggests that operators consider using not only the guidance referenced by the commenter, Airbus Canada Limited Partnership AOM CS
AOM53000002, but also the procedure in the AMP, Airbus Canada Limited Partnership DMC BD500A
J05511201AAA284AA, should excessive amounts of water be found in the galley. However, because this AD
does not require an inspection for liquid spillage in or around the galley area, the FAA has not changed this AD in this regard.
Conclusion The FAA reviewed the relevant data, considered the comments received, 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
Airbus Canada Limited Partnership has issued Service Bulletin BD500
530009, Issue 001, dated July 31, 2020.
This service information describes procedures for replacing the forward galley slotted drain covers with solid blanking plates and modifying the associated drain tubing to block water.
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 the ADDRESSES section.
Costs of Compliance The FAA estimates that this AD
affects 39 airplanes 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
Cost on U.S.
operators
1 work-hour $85 per hour = $85

$665

$750

$29,250

jspears on DSK121TN23PROD with RULES1

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this 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
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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.

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List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of 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:

20212007 Airbus Canada Limited Partnership Type Certificate Previously Held by C Series Aircraft Limited Partnership CSALP; Bombardier, Inc.:
Amendment 3921745; Docket No.

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