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Federal Register / Vol. 86, No. 59 / Tuesday, March 30, 2021 / Rules and Regulations f Compliance Comply with this AD within the compliance times specified, unless already done.
g Actions 1 Within 24 months after the effective date of this AD, inspect the right butt line 6
floor beam inboard support links at fuselage stations FS 499, 531, and 569.5 for corrosion by following the Accomplishment Instructions, steps A through M, of Gulfstream GV Customer Bulletin No. 231, Revision A, dated July 30, 2019 Gulfstream CB 231A. Where Gulfstream CB 231A
specifies contacting Gulfstream for procedures if any corrosion is found, you must replace the support link in accordance with a method approved by the Manager, Atlanta ACO Branch, FAA, before further flight. For a method to be approved by the Manager, Atlanta ACO Branch, as required by this paragraph, the Managers approval letter must specifically refer to this AD.
2 Within 24 months after the effective date of this AD, revise the airworthiness limitations section of your maintenance manual or inspection program to incorporate the airworthiness limitations specified in Table 13: Fuselage Inspection Table in Section 051010 of Chapter 5Time Limits/Maintenance Checks of Gulfstream GV Aircraft Maintenance Manual, Revision 51, dated February 28, 2020. Thereafter, except as provided in paragraph h of this AD, no alternative inspection intervals may be approved for the fuselage floor beam and wing link FS 465FS 576.

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h Alternative Methods of Compliance AMOCs 1 The Manager, Atlanta ACO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph i1 of this AD.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.
3 For service information that contains steps that are labeled as Required for Compliance RC, the following provisions apply.
i The steps labeled as RC, including substeps under an RC step and any figures identified in an RC step, must be done to comply with the AD. An AMOC is required for any deviations to RC steps, including substeps and identified figures.
ii Steps not labeled as RC may be deviated from using accepted methods in accordance with the operators maintenance or inspection program without obtaining approval of an AMOC, provided the RC steps, including substeps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition.

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i Related Information For more information about this AD, contact Ronald Wissing, Aviation Safety Engineer, Atlanta ACO Branch, FAA, 1701
Columbia Avenue, College Park, GA 30337;
phone: 404 4745552; fax: 404 4745606;
email: ronald.wissing@faa.gov.
j Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.
2 You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.
i Gulfstream GV Customer Bulletin Number 231, Revision A, dated July 30, 2019.
ii Table 13: Fuselage Inspection Table in Section 051010 of Chapter 5Time Limits/Maintenance Checks of Gulfstream GV Aircraft Maintenance Manual, Revision 51, dated February 28, 2020.
3 For Gulfstream Aerospace Corporation service information identified in this AD, contact Gulfstream Aerospace Corporation, Technical Publications Dept., P.O. Box 2206, Savannah, GA 314022206; phone: 800
8104853; fax: 912 9653520; email: pubs@
gulfstream.com; website: https
www.gulfstream.com/en/customer-support/.
4 You may view this service information at 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.
5 You may view this service information 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 March 5, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202106500 Filed 32921; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20200917; Project Identifier MCAI202000606A; Amendment 3921467; AD 20210601
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 all
SUMMARY:

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Pilatus Aircraft Ltd. Pilatus Model PC
24 airplanes. This AD was prompted by a report that electronic circuit breakers ECBs were found in a locked state after maintenance, but before flight. This AD
requires revising the airplane flight manual AFM to incorporate a procedure to check for the ECB status.
The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective May 4, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of May 4, 2021.
ADDRESSES: For service information identified in this final rule, contact Pilatus Aircraft Ltd., Customer Technical Support MCC, P.O. Box 992, CH6371 Stans, Switzerland; phone:
+41 041 619 67 74; fax: +41 041 619
67 73; 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 Street, Kansas City, MO. 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
0917.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200917; 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 mandatory continuing airworthiness information 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 Street, Room 301, Kansas City, MO 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 all Pilatus Model PC24
airplanes. The NPRM published in the
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