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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA20200969.
5 You may view this material that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email fedreg.legal@
nara.gov, or go to: https www.archives.gov/
federal-register/cfr/ibr-locations.html.
Issued on January 12, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202103568 Filed 22221; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20200818; Project Identifier MCAI202000987A; Amendment 3921381; AD 20210105
RIN 2120AA64

Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Pilatus Aircraft Ltd. Pilatus Model PC
24 airplanes. This AD results from 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
identifies the unsafe condition as electrical harness installations on PC24
airplanes that are not in compliance with the approved design. This unsafe condition could lead to wire chafing and potential arcing or failure of wires having the incorrect length, possibly resulting in loss of system redundancy, or generation of smoke and smell, or loss of power plant fire protection function. This AD requires modifying the electrical harness installation. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective March 30, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of March 30, 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@pilatusSUMMARY:

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aircraft.com; website: http
www.pilatus-aircraft.com/. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, Missouri 64106. For information on the availability of this material at the FAA, call 8163294148.
It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0818.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200818; 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, Missouri 64106;
phone: 816 3294059; fax: 816 329
4090; 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 September 17, 2020 85 FR 58002. The NPRM was prompted by MCAI
originated by the European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union. EASA has issued EASA AD No. 20200158, dated July 16, 2020 referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI
states:
During production, electrical harness installations on some PC24 aeroplanes were found not to comply with the approved design.
This condition, if not corrected, could lead to wire chafing and potential arcing, or to failure of wires having the incorrect length, possibly resulting in loss of system redundancy, or generation of smoke and smell, or loss of power plant fire protection function.
To address this potential unsafe condition, Pilatus issued the service bulletin SB,
PO 00000

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10775

providing instructions to improve the electrical harness installations in the nose bay, cockpit, fuselage, wing fairing and rear fuselage areas.
For the reason described above, this EASA AD requires modification of the electrical harness installations.

The incorrect length wires are too short in length and do not have appropriate slack, which could lead to wires being pulled loose from the terminals during flight or ground operation. Generation of smell refers to the smell from electrical arcing. You may examine the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200818.
In the NPRM, the FAA proposed to require modifying the electrical harness installation. 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.
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.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Pilatus PC24
Service Bulletin No. 91001, dated April 7, 2020. The service information specifies procedures necessary to improve the electrical harness installation in the nose bay, cockpit, avionics rack, fuselage, wing fairing, and rear fuselage. 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 section.
Costs of Compliance The FAA estimates that this AD will affect 36 products of U.S. registry. The FAA also estimates that it will take 20

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