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Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Proposed Rules
address premature corrosion and subsequent failure of the nacelle to landing gear and nacelle to rear wing spar attachment pins, which if undetected, could lead to a single or dual collapse of the main landing gear.
See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
De Havilland Aircraft of Canada Limited has issued-Service Bulletin 84
5428, Revision B, dated January 24, 2020; and Service Bulletin 845431, Revision B, dated February 21, 2020.
This service information describes procedures for doing a detailed visual inspection of the nacelle to wing rear spar attachment pins, and the nacelle and landing gear attachment pins, for any corrosion; and doing all applicable corrective actions. Corrective actions include applying epoxy primer to the bore surface of the pins, a fluorescent magnetic particle inspection for any cracking, corrosion removal, reworking
and part marking certain pins, and replacing any cracked or corroded pins with serviceable pins. These documents are distinct since they apply to different airplane configurations.
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.
Differences Between This Proposed AD
and the MCAI or Service Information Where Part III of TCCA CF2020
51R1, dated February 24, 2021, specifies a detailed visual inspection and rectification of the nacelle and landing gear attachment pins, this AD requires a re-part mark of the yoke attachment pin as specified in Part B of the Accomplishment Instructions of De Havilland Service Bulletin 845431, Revision B, dated February 21, 2020.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 41
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
Up to 9 work-hours $85 per hour = Up to $765

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The FAA has received no definitive data on which to base the cost estimates for the on-condition actions specified in this proposed AD.
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
VerDate Sep<11>2014

16:40 Jun 28, 2021

Jkt 253001

Cost per product $0

Up to $765

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 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:

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Fmt 4702

Cost on U.S. operators
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Up to $31,365.

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
20210514; Project Identifier MCAI
202001570T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by August 13, 2021.
b Affected ADs None.
c Applicability This AD applies to De Havilland Aircraft of Canada Limited type certificate previously held by Bombardier, Inc. Model DHC8400, 401, and 402 airplanes, certificated in any category, serial numbers 4001, 4003 through 4550 inclusive, 4583
through 4585 inclusive, 4587, 4588, and 4590.
d Subject Air Transport Association ATA of America Code 54, Nacelles/pylons.
e Unsafe Condition This AD was prompted by a report that the epoxy primer on the internal bore of the
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