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Federal Register / Vol. 86, No. 138 / Thursday, July 22, 2021 / Proposed Rules
proposed AD would require repeating the inspection every 150 flight hours.
Pilatus Report 121700640000B
specifies contacting Pilatus for further instructions. This proposed AD would require using an FAA-approved repair method. Pilatus Report 12170064
0000B applies to Pilatus PC12 aircraft serial numbers 190 to 1575. This proposed AD would apply to all Pilatus
Aircraft Ltd. Models PC12/45, PC12/
47, and PC12/47E airplanes, regardless of serial number, if STC SA00634DE is installed.
Interim Action The FAA considers this AD an interim action. Pilatus is working on a modification with the intent of minimizing, if not eliminating, the buffeting of the strakes. Once this action
is developed, approved, and available, the FAA may consider additional rulemaking.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 30
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Action Inspection of the strake assemblies.

Labor cost
Parts cost
Cost per product
1 work-hour $85 per hour = $85 per inspection cycle.

Not applicable

$85 per inspection cycle

The extent of damage found during the proposed inspections may vary considerably from airplane to airplane.
The FAA has no way of knowing how many airplanes may have damage or the extent of damage each airplane may have.

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.

Authority for This Rulemaking
List of Subjects in 14 CFR Part 39

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.

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

lotter on DSK11XQN23PROD with PROPOSALS1

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,
VerDate Sep<11>2014

16:30 Jul 21, 2021

Jkt 253001

The Proposed Amendment
Cost on U.S.
operators $2,550 per inspection cycle.

d Subject Joint Aircraft System Component JASC
Code 5350, Aerodynamic Faring.
e Unsafe Condition This AD was prompted by a report of the strake attachment brackets and surrounding structure failing at the upper most bracket bolt hole. The FAA is issuing this AD to detect and address any looseness or damage to the strake, attachment brackets or surrounding structure, and missing fasteners or loose bolts, which could result in airplane flutter and reduced lateral stability, which may lead to loss of control of the airplane.

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

f Compliance
PART 39AIRWORTHINESS
DIRECTIVES

g Inspection and Corrective Actions
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:

Pilatus Aircraft Ltd.: Docket No. FAA
20210573; Project Identifier 2018CE046
AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 7, 2021.
b Affected ADs None.
c Applicability This AD applies to Pilatus Aircraft Ltd.
Pilatus Models PC12/45, PC12/47, and PC12/47E airplanes, all serial numbers, certificated in any category, with a Spectre Lift Platform System installed in accordance with Supplemental Type Certificate No.
SA00634DE.

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Comply with this AD within the compliance times specified, unless already done.
Within 10 hours time-in-service TIS after the effective date of this AD and thereafter at intervals not to exceed 150 hours TIS, inspect the outside and inside fuselage strakes for movement, the strakes and their attachment brackets for loose and missing bolts and screws, and the strake attachment brackets and surrounding structure for discoloration, deformation, cracks, and other structural damage by following the Accomplishment InstructionsAircraft, steps A through B.3
and C.1 through C.5, in Pilatus Service Bulletin PC12 Series, Report Number 12
1700640000, Revision B, dated August 10, 2018.
1 You must accomplish the inside fuselage inspection regardless of the results of the outside fuselage inspection.
2 If any movement of the strakes, a loose or missing bolt or screw, discoloration, deformation, a crack, or other structural damage is found during any of the inspections, before further flight, repair using FAA-approved procedures.
h Special Flight Permit A special flight permit may be issued to allow flying the airplane to a maintenance facility where repair of the strake assembly will be performed with the following operating limitations:

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