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Federal Register / Vol. 86, No. 234 / Thursday, December 9, 2021 / Rules and Regulations Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to Pilatus Aircraft Ltd. Model PC
12/45, PC12/47, and PC12/47E
airplanes with STC SA00634DE
installed. The NPRM published in the Federal Register on July 22, 2021 86 FR
38613. The NPRM was prompted by a report of strake attachment brackets and the fuselage frame failing at the upper most bracket attachment location. In the NPRM, the FAA proposed to require inspecting the strake, attachment brackets, and bolts for movement and damage, both internal and external, and replacing components and repairing damage if necessary. The FAA is issuing this AD to prevent buffeting of the strakes. This condition, if not addressed, could result in airplane flutter and reduced lateral stability, which may lead to loss of control of the airplane.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
Differences Between the NPRM and the Final Rule The FAA has clarified the wording of the required inspections in paragraph
g of this AD. This is not a substantive change.
Conclusion The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for the changes described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Pilatus Service Bulletin PC12 Series, Report Number 121700640000, Revision B, dated August 10, 2018 Pilatus Report 12
1700640000B, which contains procedures for inspection of all fuselage strake attachment bolts and the surrounding structure. 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.
Differences Between This AD and the Service Information
69997

bulletin and recommends repeat inspections without specifying an inspection interval. This AD requires repeating the inspection every 150 flight hours. Pilatus Report 12170064
0000B specifies contacting Pilatus for further instructions. This AD requires using an FAA-approved repair method.
Pilatus Report 121700640000B
applies to Pilatus PC12 aircraft serial numbers 190 to 1575. This AD applies to all Pilatus Aircraft Ltd. Models PC
12/45, 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
affects 30 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

Pilatus Report 121700640000B
specifies a one-time inspection within 10 flight hours of issuance of the service
ESTIMATED COSTS
Action
Labor cost
Parts cost
Cost per product
Inspection of the strake assemblies.

1 work-hour $85 per hour =
$85 per inspection cycle.

Not applicable

$85 per inspection cycle

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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.
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
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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 This AD will not have federalism implications under Executive Order 13132. This AD will 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 that this AD:
1 Is not a significant regulatory action under Executive Order 12866,
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Cost on U.S.
operators $2,550 per inspection cycle.

2 Will not affect intrastate aviation in Alaska, and 3 Will 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 Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

E:FRFM09DER1.SGM

09DER1