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Federal Register / Vol. 86, No. 193 / Friday, October 8, 2021 / Proposed Rules
been installed incorrectly. Other S12
aeroplanes may also be affected by this installation error.
This condition, if not detected and corrected, could lead to damage to the aeroplane, possibly resulting in injury to occupants.
To address this unsafe condition, Stemme issued the SB service bulletin to provide inspection instructions.
For the reason described above, this EASA AD requires a one-time inspection of the MLG installation and, depending on findings, the accomplishment of applicable corrective actions.

You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0842.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Stemme Service Bulletin No. P062980037, Revision 00, dated June 5, 2019 SB P062980037.
The service information specifies inspecting and repairing, if necessary, the MLG leg connection to the center steel frame. 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 ADDRESSES.
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.

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Proposed AD Requirements in This NPRM
This proposed AD would require inspecting the MLG installation and, depending on the findings, further inspection of the components, surrounding structure, and systems for damage and repair.
Differences Between This Proposed AD
and the Service Information SB P062980037 allows the pilot/
owner to perform the initial inspection for correct installation, and this proposed AD would not. SB P062
980037 specifies contacting Stemme AG
for certain repair instructions, while this proposed AD would require repair using a method approved by the FAA or EASA.

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Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 11
gliders of U.S. registry. The FAA
estimates that it would take 0.5 work hour per glider to inspect the MLG
installation. The average labor rate is $85 per work hour. Based on these figures, the FAA estimates the cost to inspect the MLG installation on U.S.
operators to be $467.50, or $42.50 per glider.
In addition, the FAA estimates that further inspection for damage of an improperly installed MLG would take about 4 work-hours costing $340 per glider. If any damage is found during this MLG inspection, it may vary considerably from glider to glider, and the FAA has no way of estimating a repair cost.
The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.
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 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,
PO 00000

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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:
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:

Stemme AG: Docket No. FAA20210842;
Project Identifier 2019CE032AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 22, 2021.
b Affected ADs None.
c Applicability This AD applies to Stemme AG Model Stemme S 12 gliders, serial numbers 12002
through 12026, inclusive, 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
issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI
describes the unsafe condition as incorrect installation of an axle connecting the main landing gear MLG to the center steel frame of the glider. The FAA is issuing this AD to prevent failure of the MLG. The unsafe condition, if not addressed, could result in damage to the glider and possible injury to occupants.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Before further flight after the effective date of this AD, visually inspect the MLG

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