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Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210715; Project Identifier AD202100259A
RIN 2120AA64

Airworthiness Directives; Various Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for various airplanes modified with certain configurations of Garmin G3X Touch Electronic Flight Instrument System installed per Supplemental Type Certificate STC No. SA01899WI or Garmin GI 275 Multi-Function Display System MFDS installed per STC No.
SA02658SE. This proposed AD was prompted by a report of a fuel quantity disparity between the amount of fuel indicated and the actual amount of fuel.
This proposed AD would require modifying the resistive fuel probe interface. The FAA is proposing this AD
to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by October 12, 2021.
SUMMARY:

You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Garmin International, Garmin Aviation Support, 1200 E 151st Street, Olathe, KS 66062;
phone: 866 7395687; email:
avionics@garmin.com; website: https
fly.garmin.com/fly-garmin/support/.
You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901
Locust, Kansas City, MO 64106. For information on the availability of this
lotter on DSK11XQN23PROD with PROPOSALS1

ADDRESSES:

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material at the FAA, call 816 329
4148.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210715; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Kevin Marks, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801
Airport Road, Wichita, KS 67209;
phone: 316 9464153; fax: 316 946
4107; email: kevin.marks@faa.gov or Wichita-COS@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210715; Project Identifier AD
202100259A at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential
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under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Kevin Marks, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801 Airport Road, Wichita, KS
67209. 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 FAA was notified of a Piper production line issue with the installation of a Garmin G3X Touch Electronic Flight Instrument System installed under STC No. SA01899WI.
After calibration and fueling the airplane to a known level, the flight crew noted that the fuel quantity indicator displayed a higher level of fuel.
The Garmin G3X Touch Electronic Flight Instrument System, when interfaced with the Garmin GEA 24
Engine Airframe Adapter for display of the fuel quantity, uses a 1K ohm resistor inline between the GEA 24 and the airplane fuel quantity resistance style sending unit float. This resistor provides lightning protection to the fuel tank as required by 14 CFR 23.954.
Use of the 1K resistor causes a GEA
error with changing resistor temperature. The farther the actual ambient temperature of the resistor is from the temperature of the fuel quantity calibration, the larger the error.
The lower the operating resistance of the fuel sending unit, the larger the error. The largest errors occur in installations with fuel sending units having an operational range less than 100 ohms. The Garmin GI 275 MFDS
installed under STC No. SA02658SE, when interfaced with the Garmin GEA
24 for display of the fuel quantity, is also subject to this unsafe condition.
The displayed fuel quantity can have an error as much as four gallons/fuel tank with the display indicating four gallons with an empty tank. This condition, if not addressed, could result in fuel starvation and engine shutdown with consequent loss of airplane control.
FAAs Determination 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 Garmin Mandatory STC Service Bulletin No.
2134, Revision A, and Garmin
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