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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Rules and Regulations
aircraft.com; website: https
www.pilatus-aircraft.com/en. You may view this referenced 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 816 329
4148. It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0857.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200857; 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:

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Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20142504, Amendment 3918045 79 FR 73803, December 12, 2014 AD 20142504.
AD 20142504 applied to all Pilatus Model PC6, PC6H1, PC6H2, PC6/
350, PC6/350H1, PC6/350H2, PC
6/A, PC6/AH1, PC6/AH2, PC6/B
H2, PC6/B1H2, PC6/B2H2, PC6/
B2H4, PC6/CH2, and PC6/C1H2
airplanes and resulted from mandatory continuing airworthiness information MCAI issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. AD 20142504
required incorporating revised airworthiness limitations into the AMM
for your FAA-approved maintenance program.
The NPRM published in the Federal Register on October 2, 2020 85 FR
62266. The NPRM was prompted by a MCAI issued by the European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union. EASA

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superseded its previous MCAIs on this unsafe condition with EASA AD 2020
0120, dated May 27, 2020 EASA AD
20200120. The NPRM proposed to require revising the airworthiness limitation section of the existing maintenance manual or instructions for continued airworthiness to incorporate new airworthiness limitations, and performing an eddy current inspection of the fuselage wing fittings and wing to fuselage fittings.
After the FAA issued the NPRM, EASA superseded EASA AD 20200120
and issued EASA AD 20200278, dated December 14, 2020 EASA AD 2020
0278 also referred to after this as the MCAI. According to EASA AD 2020
0278, an installation procedure specified in the service information identified in the NPRM contained an error and, therefore, did not adequately address the identified unsafe condition.
Pilatus revised the airworthiness limitations and issued corrected service information, which includes installing certain bushes using grease instead of a bonding agent and an additional onetime eddy current inspection of the fuselage wing fittings and wing-tofuselage fittings if the last inspection was performed using an earlier version of the service information. You may examine the MCAI in the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200857.
The FAA issued a supplemental notice of proposed rulemaking SNPRM
to amend 14 CFR part 39 to supersede AD 20142504. The SNPRM published in the Federal Register on March 8, 2021 86 FR 13222. The SNPRM
proposed to add an eddy current inspection of each fuselage wing fitting if an earlier version of the service information was accomplished. The FAA is issuing this AD to address reduced airplane controllability due to possible loss of structural integrity of certain parts.
Discussion of the Final Airworthiness Directive Comments The FAA received no comments on the SNPRM 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 the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition
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described in the MCAI and service information referenced above. The FAA
reviewed the relevant data and determined that air safety requires adoption of the 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 SNPRM.
Related Service Information Under 1
CFR Part 51
Pilatus issued the Airworthiness Limitations Section of PC6
Airworthiness Limitations Document No. 02334, Revision 10, dated October 30, 2020; and Section 040000, Airworthiness Limitations of Chapter 04, Airworthiness Limitations, of the Pilatus PC6 Aircraft Maintenance Manual Document No. 01975, Revision 30, dated October 30, 2020. This service information contains airworthiness limitations for the stabilizer trim actuator, fuselage wing fittings, and wing-to-fuselage fittings. These documents are distinct since they apply to different airplane models.
Pilatus also issued Section 530001, Fuselage Wing FittingsInspection/
Check, of the Pilatus PC6 Aircraft Maintenance Manual Document No.
01975, Revision 30, dated October 30, 2020; Section 570003, Wing to Fuselage FittingsInspection/Check, of the PC6 Aircraft Maintenance Manual Document No. 01975, Revision 29, dated February 28, 2020; Appendix K, Fuselage Wing FittingsInspection/
Check, of the PC6 Airworthiness Limitations Document No. 02334, Revision 10, dated October 30, 2020;
and Appendix L, Wing to Fuselage FittingsInspection/Check, of the PC6
Airworthiness Limitations Document No. 02334, Revision 9, dated March 6, 2020. This service information specifies procedures for repetitive eddy current inspections of the fuselage wing fittings and wing-to-fuselage fittings and, if necessary, installing the bush on the fuselage wing fittings using grease.
These documents are distinct since they apply to different airplane models.
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
affects 30 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

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