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Federal Register / Vol. 86, No. 121 / Monday, June 28, 2021 / Proposed Rules Related Service Information Under 1
CFR Part 51
The FAA reviewed Viking Air Limited DHC3 Otter Service Bulletin Number V3/0008, Revision NC, dated February 9, 2017. The service information specifies determining service life limits for the wing strut fitting on the main spar and for the tiebar, and contains instructions for removal and replacement. De Havilland Aircraft of Canada has issued DHC3
Otter Service Bulletin Number 3/37, Revision B, dated October 8, 1982. The service information specifies instructions for removal and replacement of the Fuselage to Wing Strut Attachment Tie-Bar. 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 ADDRESSES.
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 our 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 in This NPRM
This AD requires accomplishing the actions specified in the service information already described.
Differences Between This Proposed AD
and the MCAI
The MCAI requires calculating the compliance time by using a formula and estimating the altitudes at which an airplane has operated. The MCAI also instructs operators to assume operations below 2,000 feet AGL when the operating altitude of the airplane is unknown. Because the FAA has no regulatory requirement for owners or operators to record or maintain the operating altitude history of an aircraft, this proposed AD would require calculating the compliance time by assuming all operations occurred below 2,000 feel AGL.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 41
airplanes of U.S. registry.
The FAA also estimates that it would take about 300 work-hours per airplane
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to replace both the wing strut fitting and the tie-bar. The average labor rate is $85
per work-hour. Required parts would cost about $5,599 per airplane.
Based on these figures, the FAA
estimates the cost of the proposed AD
on U.S. operators to be $1,275,059 or $31,099 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 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:

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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:

Viking Air Limited: Docket No. FAA2021
0214; Project Identifier 2018CE064
AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by August 12, 2021.
b Affected ADs None.
c Applicability This AD applies to Viking Air Limited Model DHC3 airplanes, all serial numbers, certificated in any category.
d Subject Joint Aircraft System Component JASC
Code 5700, Wings.
e Unsafe Condition This AD was prompted by mandatory continuing airworthiness information MCAI
originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI
describes the unsafe condition as fatigue damage of the wing strut lug fitting components or the fuselage to wing strut attachment tie-bar. The FAA is issuing this AD to identify and correct potential fatigue damage of the wing strut lug fitting components of the fuselage to wing strut attachment. The unsafe condition, if not addressed, could result in cracking and failure of the structural integrity of the wing or the tie-bar.
f Actions and Compliance Unless already done, do the following actions in paragraphs f1 through 3:
1 For all airplanes: Within 3 months after the effective date of this AD, determine and record the number of equivalent air time hours on each wing and tie-bar by doubling the total hours time-in-service TIS
accumulated on each part. If the total hours TIS of a tie-bar is unknown or cannot be determined, use the total hours TIS of the wing strut lug fitting on the main spar.
2 For airplanes with a maximum certificated gross weight that has never exceeded 8,000 pounds: Remove from service each left and right hand wing strut fitting and tie-bar by following the Accomplishment Instructions in Viking Air Limited SB V3/
0008, Revision NC, dated February 9, 2017, and the Replacement section of the Accomplishment instructions in De Havilland Aircraft of Canada DHC3 Otter Service Bulletin Number 3/37, Revision B, dated October 8, 1982, at whichever of the following compliance time that occurs later:

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