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Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules Mandatory STC Service Bulletin No.
2135, Revision A, both dated April 23, 2021. This service information specifies procedures for modifying the GEA 24
resistive fuel probe interface. These documents are distinct since they apply to different STCs. 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.
Other Related Service Information The FAA also reviewed Master Drawing List MDL Document No. 005
0132000, Revision 10, for STC No.

SA01899WI, and MDL Drawing No.
0050120841, Revision 10, for STC No.
SA02658SE, both dated April 23, 2021.
This service information contains the type design data for installation of the STC. Revision 10 introduces a new fuel quantity interface and configuration to eliminate the unsafe condition described previously.
Proposed AD Requirements in This NPRM
This proposed AD would require modifying the resistive fuel probe interface. The proposed AD would apply to airplanes on the approved model list for STC No. SA01899WI,
48071

installed in accordance with MDL
Document No. 0050132000, Revision 9 or earlier, and STC No. SA02658SE, installed in accordance with MDL
Drawing No. 0050120841, Revision 9
or earlier, if the installation is interfaced with a Garmin Engine Adapter GEA 24
connected to resistive fuel probes.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 920
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Action
Labor cost
Modify fuel probe interface and recalibrate the fuel system.

8 work-hours $85 per hour = $680

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this proposed AD may be covered under warranty, thereby reducing the cost impact on affected operators.

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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
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Parts cost
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:

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Cost per product
$10

$690

Cost on U.S.
operators $634,800

Various Airplanes: Docket No. FAA2021
0715; Project Identifier AD202100259
A.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by October 12, 2021.
b Affected ADs None.
c Applicability This AD applies to all serial numbers of the airplane models listed in table 1 to paragraph c, certificated in any category, that are either:
1 Modified with a Garmin G3X Touch Electronic Flight Instrument System under Supplemental Type Certificate STC No.
SA01899WI, installed in accordance with Master Drawing List MDL Document No.
0050132000, Revision 9 or earlier, interfaced with a Garmin Engine Adapter GEA 24 connected to resistive fuel probes; or 2 Modified with a Garmin GI 275 MultiFunction Display System under STC No.
SA02658SE, installed in accordance with MDL Revision 9 or earlier, interfaced with a Garmin Engine Adapter GEA 24 connected to resistive fuel probes.
Note 1 to paragraph c: Garmin Mandatory STC Service Bulletin No. 2134, Revision A, and Garmin Mandatory STC
Service Bulletin No. 2135, Revision A, both dated April 23, 2021, contain information for how to determine if your airplane has a resistive probe interface.
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