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Federal Register / Vol. 86, No. 237 / Tuesday, December 14, 2021 / Rules and Regulations In addition, the FAA estimates that any necessary rework would take 12
work-hours and require parts costing $400, for a cost of $1,420 per airplane.
The FAA has no way of determining the number of airplanes that may need these actions. If the reworked MLG area is found damaged during a follow-on magnetic particle inspection, because the damage may vary considerably from airplane to airplane, the FAA has no way of estimating this repair cost.
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 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.
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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,
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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:

20212416 Daher Aeropsace Type Certificate Previously Held by SOCATA: Amendment 3921837;
Docket No. FAA20210795; Project Identifier 2019CE054AD.
a Effective Date This airworthiness directive AD is effective January 18, 2022.
b Affected ADs None.
c Applicability This AD applies to Daher Aerospace type certificate previously held by SOCATA
Model TB 20 and TB 21 airplanes, all serial numbers, certificated in any category.
d Subject Joint Aircraft System Component JASC
Code 3200, Landing Gear System.
e Unsafe Condition 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
describes the unsafe condition as cracks on the main landing gear MLG legs. The FAA
is issuing this AD to prevent structural failure of an MLG leg and consequent collapse of the MLG. The unsafe condition, if not addressed, could result in damage to the airplane and injury to occupants.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Repetitive Inspections 1 Before the MLG exceeds 16,000
landings since first installation on an airplane or within 200 landings after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 3,200 landings, accomplish the magnetic particle inspection on each MLG for cracks in the left-hand and right-hand MLG leg and take all applicable corrective actions before further flight in accordance with the Description of Accomplishment Instructions in Daher Aerospace Service Bulletin SB 10
15432, dated September 2019, except you are not required to contact the manufacturer.
Instead, repair using a method approved by the Manager, International Validation Branch, FAA; the European Union Aviation Safety Agency EASA; or Daher Aerospaces
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EASA Design Organization Approval DOA.
If approved by the DOA, the approval must include the DOA-authorized signature. For a repair to be approved as required by this paragraph, the approval letter must specifically refer to this AD.
2 For the purposes of this AD, any maneuver resulting in weight on the MLG for any duration of time after initial takeoff counts as a landing. If the number of landings for the MLG is unknown, multiply the number of airframe hours by a factor of 3.6
and round up to the nearest whole landing.
h Alternative Methods of Compliance AMOCs 1 The Manager, International Validation 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 or email: 9-AVS-AIR-730-AMOC@faa.gov.
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.
i Related Information 1 For more information about this AD, contact Gregory Johnson, Aviation Safety Engineer, FAA, General Aviation & Rotorcraft Section, International Validation Branch, 901
Locust, Room 301, Kansas City, MO 64106;
phone: 720 6265462; fax: 816 3294090;
email: gregory.johnson@faa.gov.
2 Refer to European Union Aviation Safety Agency EASA AD 20190274, dated November 6, 2019, for more information. You may examine the EASA AD in the AD docket at https www.regulations.gov by searching for and locating Docket No. FAA20210795.
j Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference IBR 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 Daher Aerospace Service Bulletin SB
1015432, dated September 2019.
ii Reserved 3 For service information identified in this AD, contact Daher Aerospace Inc., Pompano Beach Airpark, 601 NE 10 Street, Pompano Beach, FL 33060; phone: 954
8931400; website: https www.tbm.aero.
4 You may view this 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 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,
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