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Federal Register / Vol. 86, No. 56 / Thursday, March 25, 2021 / Rules and Regulations 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 detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

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20210514 Air Tractor, Inc.: Amendment 3921457; Docket No. FAA20200710;
Project Identifier 2019CE037AD.
a Effective Date This airworthiness directive AD is effective April 29, 2021.
b Affected ADs None.
c Applicability This AD applies to Air Tractor, Inc., Air Tractor, Models AT250, AT300, AT301, AT302, AT400, AT400A, AT401, AT
401A, AT401B, AT402, AT402A, AT
402B, AT501, AT502, AT502A, AT502B, AT503, AT503A, AT504, AT602, AT
802, and AT802A airplanes, all serial numbers, certificated in any category.
d Subject Joint Aircraft System Component JASC of America Code: 2750, TE flap control system e Unsafe Condition This AD was prompted by reports from Air Tractor that the flap actuator attachment brackets can crack and detach from the torque tube. The FAA is issuing this AD to detect and correct cracks in the flap actuator attachment brackets. The unsafe condition, if not addressed, could lead to the brackets detaching from the torque tube, which could result in an uncommanded retraction of the flaps with consequent loss of airplane control.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Actions 1 Within 300 hours time-in-service TIS
after the effective date of this AD and thereafter at intervals not to exceed 900 hours TIS, perform a dye penetrant inspection of each flap torque tube actuator attachment bracket for cracks in accordance with steps 4B2 through 7 of Air Tractor, Inc., Service Letter 347, Revision A, dated December 9, 2019 Air Tractor SL 347, Rev A.
i If there is a crack, before further flight, replace the flap torque tube with a flap torque tube that has zero hours TIS or a part that has been inspected in accordance with paragraph g1 of this AD and passed the inspection.
ii If there are no cracks, before further flight, complete the actions in steps 4B9
and 10 of Air Tractor SL 347, Rev A.
2 Within 345 hours TIS after the inspection required by paragraph g1 of this AD and thereafter at intervals not to exceed 345 hours TIS, visually inspect each flap torque tube actuator attachment bracket for cracks in accordance with steps 4A1
through 3 of Air Tractor SL 347, Rev A.
If there is a crack, before further flight, replace the flap torque tube with a flap torque tube that has zero hours TIS or with a flap torque tube that has been inspected in accordance with paragraph g1 of this AD
and passed the inspection.
3 Replacing a flap torque tube does not terminate any of the inspections required by this AD.

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h Alternative Methods of Compliance AMOCs 1 The Manager, Fort Worth ACO Branch, AIR7F0, has the authority to approve AMOCs for this AD, if requested using the procedures found in 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 Fort Worth ACO
Branch, send it to the attention of the person identified in Related Information.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of your local Flight Standards District Office.
i Related Information For more information about this AD, contact Kenneth A. Cook, Aviation Safety Engineer, Fort Worth ACO Branch, AIR7F0, FAA, 10101 Hillwood Pkwy, Fort Worth, TX
76177; phone: 817 2225475; email:
kenneth.a.cook@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 Air Tractor, Inc., Service Letter 347, Revision A, dated December 9, 2019.
ii Reserved 3 For Air Tractor, Inc., service information identified in this AD, contact Air Tractor, Inc., P.O. Box 485, Olney, TX 76374:
phone: 940 5645616: email: info@
airtractor.com; website: https
airtractor.com/.
4 You may view this service information at FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust St, 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 February 24, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202106142 Filed 32421; 8:45 am BILLING CODE 491013P

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