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Federal Register / Vol. 86, No. 213 / Monday, November 8, 2021 / Proposed Rules 5. Tasks 57039 to 57041 Inspection for wing upper skin disbond.
Task 27004 Replacement of flight control cables after spillage of corrosive materials in PSM 1611 was limited to landplane configurations in previous revisions of PSM
1611 but is now applicable to all configurations.
The intent of the word airframe in PSM
1611 Revision 9 is to include fuselage, nacelles, struts, interiors, cowlings, fairings, airfoils, landing gear and their controls. The airframe life limitation in PSM 1611
Revision 9 is not intended to apply to components such as those in the fuel, electrical and hydraulic systems that are occasionally transferred from one aeroplane to another and may be salvaged from an aeroplane that is retired from service for use on an in-service aeroplane. PSM 1613
defines current airworthiness limitations for DHC6 avionics that are not addressed in this Transport Canada AD.

Model DHC6400 airplanes were type certificated after AD CF200014
was issued and are subject to the same unsafe condition. You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0960.
Related Service Information Under 1
CFR Part 51
The FAA reviewed DHC6 Twin Otter PSM 1611, Airframe Airworthiness Limitations Manual, Revision 9, dated April 30, 2018. The service information contains airworthiness limitations for certain structural components. 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 this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI and service information referenced above. The FAA is issuing this NPRM after determining the unsafe condition described previously is likely to exist or develop on other products of the same type design.
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Proposed AD Requirements This proposed AD would require incorporating into maintenance records new or revised life limits, modification limits, and inspection or overhaul intervals. This proposed AD would also allow a phase-in compliance period for the initial completion of certain tasks.

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ADs Mandating Airworthiness Limitations The FAA has previously mandated airworthiness limitations by issuing ADs that require revising the airworthiness limitation section ALS
of the existing maintenance manual or instructions for continued airworthiness to incorporate new or revised inspections and life limits. This proposed AD, however, would require incorporating new or revised inspections and life limits into the maintenance records required by 14
CFR 91.417a2 or 135.439a2 for your airplane. The FAA does not intend this as a substantive change. Requiring incorporation of the new ALS
requirements into the maintenance records, rather than requiring individual repetitive inspections and replacements, allows operators to record AD
compliance once after updating the maintenance records, rather than recording compliance after every inspection and part replacement.
Differences Between This Proposed AD
and the MCAI
The MCAI applies to Viking Air Limited Model DHC6 series 110, DHC
6 series 210, DHC6 series 310, and DHC6 series 320, and this proposed AD would not because these models do not have an FAA type certificate.
Transport Canada Models DHC6 series 1, DHC6 series 100, DHC6 series 200, DHC6 series 300, and DHC6 series 400 airplanes correspond to FAA Model DHC61, DHC6100, DHC6200, DHC6300, and DHC6400 airplanes, respectively.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 33
airplanes of U.S. registry.
The FAA also estimates that it would take about 1 work-hour per airplane to incorporate life limits, modification limits, and inspection or overhaul intervals, into maintenance records. The average labor rate is $85 per work-hour.
Based on these figures, the FAA
estimates the cost of the proposed AD
on U.S. operators to be $2,805 or $85
per airplane.
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
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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 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:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive 801310, Amendment 393812 45 FR
43155, June 26, 1980; Airworthiness Directive 801312 R1, Amendment 39
4135 46 FR 31251, June 15, 1981; and Airworthiness Directive 20080301, Amendment 3915350 73 FR 5729, January 31, 2008; and b. Adding the following new airworthiness directive:

Viking Air Limited Type Certificate Previously Held by Bombardier, Inc., de
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