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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Rules and Regulations
on an aviation product. The MCAI
identifies the unsafe condition as the need to revise certain airworthiness limitations and certification maintenance instructions. 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 certain publications listed in this AD
as of July 15, 2021.
ADDRESSES: For service information identified in this final rule, contact Pilatus Aircraft Ltd., Customer Support General Aviation, 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.

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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.
FAA20200812; 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, the MCAI, 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 all Pilatus Model PC24
airplanes. The NPRM published in the Federal Register on March 11, 2021 86
FR 13838. The NPRM was based on MCAI from the European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union. EASA
issued AD 20200202, dated September 22, 2020 referred to after this as the
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MCAI to correct an unsafe condition for Pilatus Model PC24 airplanes. The MCAI states:
The airworthiness limitations and certification maintenance instructions for Pilatus PC24 aeroplanes, which are approved by EASA, are currently defined and published in Pilatus PC24 AMM Aircraft Maintenance Manual Chapter 040000.
These instructions have been identified as mandatory for continued airworthiness.
Failure to accomplish these instructions could result in an unsafe condition.
Previously, EASA issued AD 20200074, dated March 27, 2020, requiring the actions described in the Pilatus PC24 AMM Chapter 040000, Document Number 02378 Issue 005 at Revision 14.
Since that AD was issued, Pilatus published the ALS Airworthiness Limitations section, at Issue 005 Revision 19, which contains the following new and/
or more restrictive tasks as specified in Mandatory Structural Inspection Items data module PC24AA0420000000A000AA
Issue 005 Revision 00:
AL2700025 and AL2700026:
Control column sprocket gear assembly, and AL2700027: Control wheel column assembly.
In addition, Airworthiness Limitations Description data module PC24AA0400
000000A040AA Issue 008 Revision 00
includes:
The new limit of validity following the completion of the Full Scale Fatigue Test, and Usage assumptions/conditions for operations on unpaved and grass runaways.

EASA AD 20200074, dated March 27, 2020, required revising the Airworthiness Limitations section ALS
to correct an error in the horizontal stabilizer primary trim system secondary power source operational test. The MCAI retains the requirements of EASA AD 20200074, dated March 27, 2020, which the MCAI supersedes, and requires the additional revisions discussed previously. You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0812.
In the NPRM, the FAA proposed to require replacing the revised sections of the ALS described previously into the existing AMM or instructions for continued airworthiness. The FAA is issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.

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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 requires 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.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Chapter 04, Airworthiness Limitations, Pilatus PC
24 Aircraft Maintenance Manual PC24
AMM Report 02378, Issue 005, Revision 19, dated May 26, 2020. This service information contains the parent data module and the new limit of validity and updates the usage assumptions and conditions for operations on unpaved and grass runways. This document also contains the revised subsections with revised maintenance actions.
The FAA also reviewed Horizontal stabilizer primary trim system secondary power sourceOperation test, data module PC24AE2740
000001A320AA, dated September 25, 2019, from PC24 AMM Report 02378, Issue 005, Revision 19, dated May 26, 2020. This service information contains revised procedures for task number AL2740022 in the certification maintenance requirements.
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.
Costs of Compliance The FAA estimates that this AD will affect 42 products of U.S. registry. The FAA also estimates that it will take about 1 work-hour per product to comply with the requirements of this proposed AD. 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 will be $3,570 or $85 per product.
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
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