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Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules bulletin accordingly, providing installation instructions.
For the reason described above, this EASA AD requires an update of the ECU
software.

You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0792.
The Model 2625 02i engine does not have an FAA type certificate. For Model DG1000M gliders, this engine is part of the glider type certification. For Model DG500MB gliders, this engine may be installed as a Model 2525 02 engine modified with a fuel injection system and re-identified as a Model 2625 02i engine.
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 that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Solo Kleinmotoren GmbH Service Bulletin No. 460011, dated August 19, 2019. This service information specifies procedures for updating the ECU software to a version that fixes a software error found in previous ECU software versions. 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.

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, 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.

Proposed AD Requirements in This NPRM

List of Subjects in 14 CFR Part 39

This proposed AD would require updating the ECU software version and would prohibit installing software version V517 Revision 7 or earlier.

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Costs of Compliance
Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

The FAA estimates that this AD, if adopted as proposed, would affect 4
gliders of U.S. registry. The FAA
estimates that it would take about 2
work-hours per glider to comply with the 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 $680 or $170 per glider.

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The Proposed Amendment
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

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

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39.13

51839

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

DG Flugzeugbau GmbH: Docket No. FAA
20210792; Project Identifier AD2020
00593G.
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 DG Flugzeugbau GmbH
Models DG500MB and DG1000M gliders, all serial numbers, certificated in any category, with a Solo Kleinmotoren GmbH
Solo Model 2625 02i engine installed.
d Subject Joint Aircraft System Component JASC
Code 7300, Engine Fuel and Control.
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 an error in the engine control unit ECU software. The FAA is issuing this AD to prevent an injection of fuel into one cylinder when the ECU is activated. The unsafe condition, if not addressed, could result in difficulty starting the engine and reduced control of the glider.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Within 3 months after the effective date of this AD, update the ECU software to software version V517 Revision 8 in accordance with the Actions in Solo Kleinmotoren GmbH Service Bulletin No.
460011, dated August 19, 2019.
2 As of the effective date of this AD, do not install ECU software version V517
Revision 7 or earlier on any glider with a Solo Kleinmotoren GmbH Solo Model 2625
02i engine.
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, Related Information, or email: 9-AVS-AIR730-AMOC@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector,
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