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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Rules and Regulations
conforming to the approved design, which could affect the structural integrity of the airplane. This AD
requires inspecting the engine attachment hardware for missing washers and loose nuts and taking corrective actions as necessary. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective July 15, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of July 15, 2021.
ADDRESSES: For service information identified in this final rule, contact Pilatus Aircraft Ltd., CH6371, Stans, Switzerland; phone: +41 848 24 7 365;
email: techsupport.ch@pilatusaircraft.com; website: https
www.pilatus-aircraft.com/. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20201074.

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201074; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Doug Rudolph, Aviation Safety Engineer, FAA, General Aviation &
Rotorcraft Section, International Validation Branch, 901 Locust, Room 301, Kansas City, MO 64106; phone:
816 3294059; fax: 816 3294090;
email: doug.rudolph@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain serial-numbered Pilatus Model PC24 airplanes. The NPRM
published in the Federal Register on March 26, 2021 86 FR 16124. The NPRM was prompted by MCAI
originated by the European Union Aviation Safety Agency EASA, which
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is the Technical Agent for the Member States of the European Union. EASA has issued EASA AD 20200194, dated September 8, 2020 referred to after this as the MCAI, to address an unsafe condition on certain serial-numbered Pilatus Model PC24 airplanes. The MCAI states:
During a scheduled maintenance inspection, the engine attachment hardware of a PC24 airplane was found not to conform to the approved design. A washer was missing beneath each of the four mating bolt heads on the rear engine beam. In addition, some of the keeper fitting attachment bolts on the LH/RH middle inner nacelle were found with loose nuts. It was also determined that other aeroplanes may have the same non-conformities.
This condition, if not detected and corrected, could damage the engine attachment hardware, possibly affecting the structural integrity of the aeroplane.
To address this potential unsafe condition, Pilatus issued the service bulletin SB, providing instructions for inspection and corrective action.
For the reason described above, this EASA AD requires a one-time inspection for missing washers and loose nuts on the engine attachment hardware and, depending on findings, the accomplishment of applicable corrective actions.

You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2020
1074.
In the NPRM, the FAA proposed to require inspecting the engine attachment hardware for missing washers and loose nuts and taking corrective actions as necessary. The FAA is issuing this AD to address the unsafe condition on this product.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
Conclusion 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 reviewed the relevant data and determined that air safety and the public interest require adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. This AD is adopted as proposed in the NPRM.

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Related Service Information Under 1
CFR Part 51
The FAA reviewed Pilatus PC24
Service Bulletin No. 71001, dated June 30, 2020. This service information specifies procedures for inspecting the engine attachment hardware for loose nuts and missing washers and taking corrective actions depending on findings. 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.
Costs of Compliance The FAA estimates that this AD
affects 34 airplanes of U.S. registry.
The FAA estimates that it would take 2.5 work-hours to do the one-time inspections. The average labor rate is $85 per work-hour.
Based on these figures, the FAA
estimates the cost of this AD on U.S.
operators would be $7,225 or $212.50
per airplane.
The FAA also estimates that, as oncondition costs, installing missing washers, replacing bolts, and doing an eddy current inspection of the bolt holes would take 4.5 work-hours and require parts costing $200 for a cost of $582.50
per airplane. This estimate assumes replacing all of the rear engine beam attachment bolts and washers and doing an eddy current inspection of all the attachment bolt holes. If the bolt holes are found damaged during the eddy current inspection, the damage will vary considerably from airplane to airplane, and the FAA has no way of estimating a repair cost. In addition, the FAA has no way of determining the number of airplanes that might need these actions.
The FAA has included all known costs in this cost estimate. According to the manufacturer, however, some of the costs of this 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 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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