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Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules To address this potential unsafe condition, DAHER Aerospace issued the service bulletin SB to provide inspection instructions.
For the reasons described above, this EASA AD requires repetitive special detailed inspections SDI using magnetic particle method of the affected MLG area, and, depending on findings, accomplishment of applicable corrective actions.

$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.

You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0795.

Authority for This Rulemaking
Related Service Information Under 1
CFR Part 51
The FAA reviewed Daher Service Bulletin SB 1015432, dated September 2019. The service information contains procedures for repetitively inspecting the MLG area for cracks and performing any rework and repair. 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.
FAAs Determination 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 this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI and service information referenced above. The FAA
is issuing this NPRM after determining the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in the service information already described.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 52
airplanes of U.S. registry. The FAA also estimates that it would take about 8
work-hours per airplane to perform the magnetic particle inspection that would be required by this proposed AD. The average labor rate is $85 per work-hour.
Based on these figures, the FAA
estimates the inspection cost of this proposed AD on U.S. operators to be $35,360, or $680 per airplane, per inspection cycle.
In addition, the FAA estimates that any necessary rework would take 12
work-hours and require parts costing
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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 The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would 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 Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

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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:

Daher Aeropsace Type Certificate Previously Held by SOCATA: Docket No. FAA20210795; Project Identifier 2019CE054AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 1, 2021.
b Affected ADs None.
c Applicability This AD applies to Daher Aerospace type certificate previously held by SOCATA
Models 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 Service Bulletin SB 1015432, 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 EASA
Design Organization Approval DOA. If approved by the DOA, the approval must include the DOA-authorized signature. For a
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