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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210694; Project Identifier MCAI202100305T at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be
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placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Thomas Niczky, Aerospace Engineer, Avionics and Electrical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 5162287347; fax 5167945531; email 9-avs-nyaco-cos@
faa.gov. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

5735, Revision A, dated February 11, 2021. This service information describes procedures for replacing or reworking the 6 outer wing fuel access panel assembly. The rework involves an eddy current or fluorescent liquid penetrant inspection of the rework area for crack indications. 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.

Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202108, dated March 9, 2021 TCCA
AD CF202108 also referred to after this as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for De Havilland Aircraft of Canada Limited Model DHC8401 and 402
airplanes, serial numbers 4001 and 4003
through 4628 inclusive. You may examine the MCAI in the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210694.
This proposed AD was prompted by the discovery that as a result of build tolerances, a hard contact could occur between the 2 top HLS terminal screw head and the 6 outer wing fuel access panel stiffener flange. The FAA is proposing this AD to address the possibility of electrical arcing during a lightning strike, which could be a source of ignition inside the fuel tank.
See the MCAI for additional background information.

FAAs Determination
Related Service Information Under 1
CFR Part 51
De Havilland Aircraft of Canada Limited has issued Service Bulletin 84

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. For either replacement or repair of the 6 outer wing fuel access panel, depending on the option selected by the operator to comply with this proposed AD, the FAA
estimates the following costs:

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ESTIMATED COSTS
Action
Labor cost
Parts cost
Replacement
Repair

Up to 10 work-hours $85 per hour = Up to $850
13 work-hours $85 per hour = $1,105

Up to $16,430
$49

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.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue
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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

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Cost per product Up to $17,280.
$1,154.

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.

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