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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations
4 For Airbus SAS service information, contact Airbus SAS, Airworthiness Office EIAS, Rond-Point Emile Dewoitine No: 2, 31700 Blagnac Cedex, France; telephone +33
5 61 93 36 96; fax +33 5 61 93 44 51; email account.airworth-eas@airbus.com; internet https www.airbus.com.
5 You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195. This material may be found in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA20200900.
6 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 14, 2021.
Ross Landes, Deputy Director for Regulatory Operations, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202103569 Filed 22221; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20200885; Project Identifier MCAI202000997A; Amendment 3921424; AD 20210403
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 was prompted by 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 improperly manufactured cockpit and cabin evaporator filters installed during production on some PC24 airplanes.
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.
SUMMARY:

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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, Missouri 64106. For information on the availability of this material at the FAA, call 816 329
4148. It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0885.

ADDRESSES:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200885; 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, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Doug Rudolph, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 901 Locust, Room 301, Kansas City, Missouri 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 Pilatus Model PC24 airplanes with certain part-numbered evaporator filter assemblies installed. The NPRM
published in the Federal Register on November 23, 2020 85 FR 74627. 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. 20200160, dated July 16, 2020 referred to after this as the MCAI, to address the unsafe condition on Pilatus Model PC24
airplanes. The MCAI states:
An occurrence was reported where, during production, cockpit and cabin evaporator filters were installed on some PC24
aeroplanes, which were not the proper parts for the affected configuration.
This condition, if not corrected, could degrade the fire retardant properties of the
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filters, possibly resulting in an increase in smoke in the cockpit/cabin in case of electrical heater over-temperature.
To address this potential unsafe condition, Pilatus issued the service bulletin SB to provide replacement instructions.
For the reason described above, this AD
requires replacement of affected parts with serviceable parts, as defined in this EASA
AD, and prohibits re installation of affected parts.

Due to a quality escape, the fire retardant used in the original filters installed in production is not sufficient for the conditions in this configuration, which is close to the heater and blowers.
The MCAI can be found in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200885.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
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. 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. 21006, dated April 3, 2020. This service information specifies procedures replace the cockpit and cabin evaporator filters with new filters contained in a modification kit.
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 MCAI
This AD applies to airplanes with a defective filter installed, whereas the EASA AD applies to airplanes that do not have the modification kit, which was installed in production. This AD
identifies the individual part numbers P/Ns of the defective filters to address any airplanes that may have had a modification kit filter replaced with a defective filter in the field before this AD becomes effective. This AD also applies to airplanes with a filter where the P/N is unknown. Pilatus advises that the defective filters can only be identified by their packing documents,
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