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48066

Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules
comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Jim Rutherford, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 901 Locust, Room 301, Kansas City, MO
64106. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20190082, dated April 12, 2019
referred to after this as the MCAI, to address an unsafe condition on Stemme AG Model Stemme S 12 gliders. The MCAI states:
During a production inspection of a new powered sailplane, an ASI was found with speed markings inconsistent with the approved and published values beginning of the white and green arc. Subsequent investigation of the production records for delivered Stemme S 12 powered sailplanes does not exclude that a similar, nonconforming ASI was installed during production.
This condition, if not corrected, could lead to erroneous information being provided to the pilot, particularly at the lower speed operation limits, possibly resulting in reduced control of the powered sailplane.
To address this unsafe condition, Stemme AG issued the SB service bulletin to provide inspections instructions.
For the reason described above, this EASA AD requires a one-time inspection of the markings of the affected part and, depending on findings, amending the Aircraft Flight Manual AFM and replacing the affected part. This EASA AD also prohibits installation of affected parts.

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You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0716.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Stemme Service Bulletin No. P062980027, Revision 00, dated December 17, 2018. The service information specifies checking the ASI
markings and provides illustrations of correct markings. The service information specifies the procedure to replace an affected ASI with an ASI
with correct markings. The service information also includes a temporary page to insert into the AFM until the
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ASI is replaced. 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.
Proposed AD Requirements in This NPRM
This proposed AD would require a one-time inspection of the ASI markings and, depending on findings, either replacing the ASI before further flight or amending the existing AFM until the ASI is replaced within 3 months.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 20
gliders of U.S. registry. The FAA
estimates that it would take about 0.5
work-hour per glider to comply with the inspection requirements of this AD. The average labor rate is $85 per work-hour.
Based on these figures, the FAA
estimates the cost of this AD on U.S.
operators to be $850 or $42.50 per glider.
The FAA estimates that amending the AFM to insert and then remove the temporary page as a result of the inspection would take about 1 workhour per glider for a total cost of $85 per glider. The FAA estimates that replacing the ASI would take about 3.5 workhours and require parts costing $603, for a total cost of $900.50 per glider. The FAA has no way of determining the number of gliders that may need these actions.
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
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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:
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. FAA20210716;
Project Identifier 2019CE023AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by October 12, 2021.

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