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Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules Related Service Information Under 1
CFR Part 51
De Havilland Aircraft of Canada Limited has issued Service Bulletin 84
2620, Revision A, dated March 9, 2021.
This service information describes procedures for doing a detailed visual inspection for chafing and proper clearance of the LH and RH MLG
primary zone APD sensing lines, the hydraulic tube assemblies and the surrounding structure, and doing all applicable corrective actions. Corrective actions include repair and replacement of the APD sensing line and the hydraulic tube assembly. 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.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI and service information referenced above. The FAA
is proposing this AD because the FAA
evaluated all the relevant information and determined the unsafe condition
described previously is likely to exist or develop on other products of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in the service information already described.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 54
airplanes of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
5 work-hours $85 per hour = $425

$0

$425

$22,950

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
the results of any required actions. The FAA has no way of determining the
number of aircraft that might need these on-condition actions:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Up to 7 work-hours $85 per hour = Up to $595

Up to 12,643

lotter on DSK11XQN23PROD with PROPOSALS1

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
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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 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.

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

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Up to $13,238.

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:

De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc.: Docket No. FAA
20210656; Project Identifier MCAI
202100394T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 27, 2021.
b Affected ADs None.

The Proposed Amendment
PO 00000

Cost per product
c Applicability This AD applies to De Havilland Aircraft of Canada Limited Model DHC8401 and 402 airplanes, certificated in any category, serial numbers 4001 and 4003 through 4614
inclusive.

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