# AD 2022-03-15: Fuel Quantity Indicator

- Type: Airworthiness directive
- Status: Current
- Products: Garmin G3X Touch Electronic Flight Instrument System (STC SA01899WI or SA02658SE)
- Effective: March 21, 2022
- Published: February 14, 2022, 87 FR 8158–8167
- Issued: January 25, 2022
- Issued as: Final rule
- Superseded by: Nothing supersedes this AD
- Product type: Appliance, Small airplane
- ATA chapter: 28 · Fuel
- Amendment: 39-21932
- Docket: FAA-2021-0715 (https://www.regulations.gov/docket/FAA-2021-0715)
- Project: AD-2021-00259-A
- Registered aircraft: 157,803 may be affected, by airframe or engine model (OpenAirDocs)
- Official PDF: https://openairdocs.org/files/sha256/a2/99/a2992fd94cb167d69195285d0d8578e939faa89df9ee7abbba05f3c27da4397c (from https://www.govinfo.gov/content/pkg/FR-2022-02-14/pdf/2022-03000.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/02/14/2022-03000/airworthiness-directives-various-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2022-03000-0000000000.0001
- DRS record last changed: May 27, 2026
- Page: https://openairdocs.org/ad/2022-03-15

## Summary

The FAA is adopting 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 (MFD) installed per STC No. SA02658SE. This AD was prompted by a report of a fuel quantity disparity between the amount of fuel indicated and the actual amount of fuel. This AD requires modifying the resistive fuel probe interface. The FAA is issuing this AD to address the unsafe condition on these products.

## The airworthiness directive

1. The authority citation for part 39 continues to read as follows:

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

2022-03-15 Various Airplanes: Amendment 39-21932; Docket No. FAA-2021-0715; Project Identifier AD-2021-00259-A.

### (a) Effective Date

This airworthiness directive (AD) is effective March 21, 2022.

### (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. 005-01320-00, 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 Multi-Function Display 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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### (d) Subject

Joint Aircraft System Component (JASC) Code 2841, Fuel Quantity Indicator.

### (e) Unsafe Condition

This AD was prompted by reports of fuel quantity disparities between the amount of fuel indicated and the actual amount of fuel. The FAA is issuing this AD to ensure that the amount of fuel indicated is the amount of fuel available. The unsafe condition, if not addressed, could result in fuel starvation and engine shutdown which could result in the inability to arrive at the destination airport or a suitable alternative airport.

### (f) Compliance

Comply with this AD within the compliance times specified, unless already done.

### (g) Action

Within 100 hours time-in-service after the effective date of this AD or within 12 months after the effective date of this AD, whichever occurs first, modify the fuel probe interface by following the Modification Instructions in Garmin Mandatory STC Service Bulletin 2134, Revision A, or Garmin Mandatory STC Service Bulletin 2135, Revision A, both dated April 23, 2021, whichever is applicable.

### (h) Alternative Methods of Compliance (AMOCs)

  (1) The Manager, Wichita ACO 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 (i) of this AD.

  (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office.

### (i) Related Information

For more information about this AD, contact Kevin Marks, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801 Airport Road, Wichita, KS 67209; phone: (316) 946-4153; email: kevin.marks@faa.gov or Wichita-COS@faa.gov.

### (j) Material Incorporated by Reference

  (1) The Director of the Federal Register approved the incorporation by reference of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.

  (2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.

    (i) Garmin Mandatory STC Service Bulletin 2134, Revision A, dated April 23, 2021.

    (ii) Garmin Mandatory STC Service Bulletin 2135, Revision A, dated April 23, 2021.

  (3) For service information identified in this AD, contact Garmin International, Garmin Aviation Support, 1200 E 151st Street, Olathe, KS 66062; phone: (866) 739-5687; email: avionics@garmin.com; website: https://fly.garmin.com/fly-garmin/support/.

  (4) 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 material at the FAA, call (817) 222-5110.

  (5) You may view this service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email: fr.inspection@nara.gov, or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

## Rule preamble

### Dates

This AD is effective March 21, 2022.

The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of March 21, 2022.

### Addresses

For service information identified in this final rule, contact Garmin International, Garmin Aviation Support, 1200 E 151st Street, Olathe, KS 66062; phone: (866) 739-5687; 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 material at the FAA, call (817) 222-5110. It is also available at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0715.

### For further information contact

Kevin Marks, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801 Airport Road, Wichita, KS 67209; phone: (316) 946-4153; email: kevin.marks@faa.gov or Wichita-COS@faa.gov.

### Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to various airplanes modified with certain configurations of Garmin G3X Touch Electronic Flight Instrument System installed per STC No. SA01899WI or Garmin GI 275 MFD installed per STC No. SA02658SE. The NPRM published in the Federal Register on August 27, 2021 (86 FR 48070). The NPRM was prompted by notification 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 when the GEA 24 or resistor is subjected to significantly hotter or colder temperatures than the temperature at which the fuel gauges were calibrated during installation. The farther the actual (ambient) temperature of the GEA 24 or 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. In the NPRM, the FAA proposed to require modifying the resistive fuel probe interface. The FAA is issuing this AD to prevent fuel starvation and engine shutdown, which could result in the inability to arrive at the destination airport or a suitable alternative airport.

### Comments

The FAA received comments from Garmin. The following presents the comments received on the NPRM and the FAA's response to each comment.

### Requests Regarding Background Information

Garmin requested the FAA correct certain information in the preamble. In the NPRM, the FAA stated that use of the 1K resistor causes a GEA error when the resistor temperature changes. According to Garmin, using the 1K resistor causes a GEA error when the GEA 24 temperature changes. Garmin further noted that 1k resistors are installed near the GEA 24 plug and are exposed to the same ambient temperatures.

The FAA agrees with correcting the preamble and has changed this final rule to clarify that a GEA error results from the GEA 24 being subjected to significantly hotter or colder temperatures than the temperature at which the fuel gauges were calibrated during installation. The FAA disagrees with the requested changes regarding the location of the resistors. The commenter's request is not supported by the information in the installation manual, which does not require the resistor to be installed near the GEA 24.

Garmin also requested that the FAA remove the exact error amount ( i.e., four gallons) between the displayed fuel quantity and the actual amount of fuel. Garmin stated that due to variations in different aircraft system configurations, this amount could be misleading.

Removing the reference to 4 gallons would minimize the potential magnitude of the error and the need for AD action. The FAA did not change this AD based on this comment.

Garmin noted a typographical error in that the NPRM referred to “MFDS” instead of “MFDs.”

The FAA agrees and has corrected all references to MFDs accordingly.

### Request Regarding Unsafe Condition

Garmin requested that the FAA change the description of the inevitable consequence of the unsafe condition. In the NPRM, the FAA stated the unsafe condition, if not addressed, could result in fuel starvation and engine shutdown with consequent loss of airplane control. Garmin stated that this incorrectly implies that loss of airplane control is the inevitable consequence of fuel starvation and engine shutdown. Garmin requested the FAA revise the preamble to state that loss of airplane control is one of many possible outcomes.

The FAA agrees that loss of control is not an inevitable result of fuel starvation. In the context of this event, the end level effect is the loss of powered flight to the destination airport. Accordingly, the FAA has revised the background section of the preamble and the unsafe condition paragraph of the AD to reflect that fuel starvation and engine shutdown could result in the inability to arrive at the destination airport or a suitable alternative airport.

### Request Regarding Applicability

Garmin requested the FAA revise the AD to remove several airplane models that are not subject to the unsafe condition. Garmin listed these models as follows: The Boeing Company Model AT-6 (Navy SNJ-2), AT-6A (Navy SNJ-3), AT-6B, AT-6C (Navy SNJ-4), AT-6D (Navy SNJ-5), AT-6F (Navy SNJ-6), BC- 1A, Navy SNJ-7, and T-6G; Cessna Aircraft Company Model T-50 (Army AT-17 and UC-78 series, Navy JRC-1); Costruzioni Aeronautiche Tecnam S.P.A. Model P2006T; Daher Aircraft Design, LLC (type certificate previously held by Quest Aircraft Design, LLC) Model Kodiak 100; EADS-PZL Warszawa-Okęcie S.A. Model PZL-104 Wilga 80; Helio Alaska, Inc. Model H-800; Howard Aircraft Foundation Model DGA-15J (Army UC-70B), DGA-15P (Army UC-70, Navy GH-1, GH-2, GH-3, NH-1), and DGA-15W; Textron Aviation Inc. Model G17S; Thrush Aircraft, LLC Model 600 S-2D, S2R, S2R-R1340, S2R-Rl820, S2R-R3S, and S2R-T34; and Waco Aircraft Company Model YMF airplanes.

The FAA agrees and has revised the list of applicable models accordingly.

### Conclusion

The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these products. Except for the changes described previously, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator.

### Related Service Information Under 1 CFR Part 51

The FAA reviewed Garmin Mandatory STC Service Bulletin 2134, Revision A, and Garmin Mandatory STC Service Bulletin 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 the ADDRESSES section.

### Other Related Service Information

The FAA also reviewed Master Drawing List (MDL) Document No. 005-01320-00, Revision 10, for STC No. SA01899WI; and MDL Drawing No. 005-01208-41, Revision 10, for STC No. SA02658SE; both dated April 23, 2021. This service information contains the type design data for installation of the STC. MDL Document No. 005-01320-00, Revision 10, dated April 23, 2021, introduces a new fuel quantity interface and configuration to eliminate the unsafe condition described previously.

### Costs of Compliance

The FAA estimates that this AD affects 920 airplanes of U.S. registry.

The FAA estimates the following costs to comply with this AD:

*Estimated Costs*

| Action | Labor cost | Parts cost | Cost per airplane | Cost on U.S. operators |
| --- | --- | --- | --- | --- |
| Modify fuel probe interface and recalibrate the fuel system | 8 work-hours × $85 per hour = $680 | $10 | $690 | $634,800 |

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 FAA's 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 Agency's 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

This AD will not have federalism implications under Executive Order 13132. This AD will 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 that this AD:

  (1) Is not a “significant regulatory action” under Executive Order 12866,

  (2) Will not affect intrastate aviation in Alaska, and

  (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

### The Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

## Affected data sheets (132, first 50) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A23](https://openairdocs.org/tcds/3A23): Maule Aerospace Technology Inc.; names 50 of 50 models: M-4-210, M-7-260, MX-7-160C, MX-7-235, M-6-180, M-6-235, M-4-220T, M-4-210C…
- [TCDS A4CE](https://openairdocs.org/tcds/A4CE): Textron Aviation Inc.; names 29 of 29 models: TP206B, T206H, TP206C, TU206A, U206, P206C, P206E, TP206A…
- [TCDS 3A21](https://openairdocs.org/tcds/3A21): Textron Aviation Inc.; names 28 of 28 models: 210J, P210N, 210D, 210R, T210M, 210, 210M, 210-5A (205A)…
- [TCDS 3A15](https://openairdocs.org/tcds/3A15): Textron Aviation Inc.; names 27 of 27 models: G36, 35-C33A, 35-A33, M35, E33A, E33C, V35B, N35…
- [TCDS 3A10](https://openairdocs.org/tcds/3A10): Textron Aviation Inc.; names 23 of 23 models: 310I, 310L, T310Q, 310P, T310R, T310P, 310A, 310R…
- [TCDS 3A13](https://openairdocs.org/tcds/3A13): Textron Aviation Inc.; names 23 of 23 models: 182D, 182A, 182J, 182P, 182B, TR182, 182L, 182G…
- [TCDS 3A16](https://openairdocs.org/tcds/3A16): Textron Aviation Inc.; names 21 of 21 models: 95, 95-B55, 95-C55A, D55, 58, 95-A55, D55A, 95-C55…
- [TCDS A6CE](https://openairdocs.org/tcds/A6CE): Textron Aviation Inc.; names 19 of 19 models: 337, T337B, T337E, 337D, T337H-SP, 337G, P337H, 337H…
- [TCDS 2A13](https://openairdocs.org/tcds/2A13): Piper Aircraft Inc.; names 18 of 18 models: PA-28R-180, PA-28R-201, PA-28-150, PA-28-201T, PA-28-236, PA-28-140, PA-28R-201T, PA-28S-160…
- [TCDS 3A12](https://openairdocs.org/tcds/3A12): Textron Aviation Inc.; names 18 of 18 models: 172F (USAF T-41A), 172M, 172Q, 172R, 172K, 172G, 172A, 172L…
- [TCDS 3A19](https://openairdocs.org/tcds/3A19): Textron Aviation Inc.; names 18 of 18 models: 150L, 150B, 150D, A150L, A150K, 150E, A150M, A152…
- [TCDS 1A2](https://openairdocs.org/tcds/1A2): Piper Aircraft Inc.; names 15 of 18 models: PA-18-105 (Special), PA-18S-105 (Special), PA-18-125 (Army L-21A), PA-19 (Army L-18C), PA-18S-135, PA-18AS-135, PA-18S, PA-18S-150…
- [TCDS 2A3](https://openairdocs.org/tcds/2A3): Mooney International Corporation; names 15 of 17 models: M20F, M20E, M20K, M20D, M20A, M20B, M20S, M20C…
- [TCDS A13EU](https://openairdocs.org/tcds/A13EU): Textron Aviation Inc.; names 14 of 14 models: FRA150M, F150G, FA152, F150H, F152, F150L, F150K, F150M…
- [TCDS A1CE](https://openairdocs.org/tcds/A1CE): Textron Aviation Inc.; names 14 of 14 models: A23-24, M19A, A24R, A24, A23, A23-19, B23, B19…
- [TCDS 7A14](https://openairdocs.org/tcds/7A14): Daher; names 13 of 13 models: Rallye 150 ST, MS 892A-150, Rallye 235 E, Rallye 100S, MS 894E, MS 894A, MS 880B, MS 892E-150…
- [TCDS 3A17](https://openairdocs.org/tcds/3A17): Textron Aviation Inc.; names 12 of 12 models: R172H, R172G, R172K, R172F, 172RG, R172J, 175, 175B…
- [TCDS A3SO](https://openairdocs.org/tcds/A3SO): Piper Aircraft Inc.; names 12 of 13 models: PA-32-300, PA-32-301, PA-32-301FT, PA-32R-300, PA-32-260, PA-32-301T, PA-32RT-300, PA-32S-300…
- [TCDS 5A6](https://openairdocs.org/tcds/5A6): Textron Aviation Inc.; names 11 of 11 models: 180E, 180J, 180F, 180H, 180A, 180, 180B, 180D…
- [TCDS A4EU](https://openairdocs.org/tcds/A4EU): Textron Aviation Inc.; names 11 of 11 models: F172F, F172M, F172H, F172L, FP172D, F172N, F172E, F172G…
- [TCDS 3A25](https://openairdocs.org/tcds/3A25): Textron Aviation Inc.; names 10 of 11 models: 320, 320D, 320-1, 320B, 320E, 335, 340A, 320C…
- [TCDS A-759](https://openairdocs.org/tcds/A-759): American Champion Aircraft Corp.; names 10 of 22 models: 7GCBA, 7FC, 7EC, 7GCA, 7KCAB, 7GC, 7GCAA, 7GCBC…
- [TCDS 1A6](https://openairdocs.org/tcds/1A6): Piper Aircraft Inc.; names 8 of 8 models: PA-22S-135, PA-22S-150, PA-22-108, PA-22-160, PA-22-150, PA-22, PA-22S-160, PA-22-135
- [TCDS 1A8](https://openairdocs.org/tcds/1A8): Helio Alaska Inc.; names 8 of 9 models: HT-295, H-700, H-395 (USAF L-28A or U-10B), H-250, H-391 (USAF UL-24), H-395A, H-391B, H-295 (USAF U10D)
- [TCDS 3A24](https://openairdocs.org/tcds/3A24): Textron Aviation Inc.; names 8 of 8 models: 185B, A185F, 185E, 185C, A185E, 185A, 185D, 185
- [TCDS A-694](https://openairdocs.org/tcds/A-694): Luscombe Aircraft Corporation; names 8 of 8 models: 8, 8D, 8A, 8F, 8B, 8E, 8C, T-8F
- [TCDS A-777](https://openairdocs.org/tcds/A-777): Textron Aviation Inc.; names 8 of 9 models: G35, A35, D35, 35R, B35, F35, 35, E35
- [TCDS A-782](https://openairdocs.org/tcds/A-782): Sierra Hotel Aero Inc.; names 8 of 8 models: Navion B, Navion H, Navion (Army L-17A), Navion F, Navion A (Army L-17B and L-17C), Navion D, Navion E, Navion G
- [TCDS A12SO](https://openairdocs.org/tcds/A12SO): Commander Aircraft Corporation; names 8 of 8 models: 114A, 112TCA, 114B, 112B, 112TC, 114, 112, 114TC
- [TCDS A23EU](https://openairdocs.org/tcds/A23EU): Textron Aviation Inc.; names 8 of 8 models: F337G, FT337GP, F337E, FT337F, FT337E, F337F, FT337HP, F337H
- [TCDS A31EU](https://openairdocs.org/tcds/A31EU): Vulcanair S.p.A.; names 8 of 10 models: P.68C-TC, P.68 Observer 2, P.68B, P.68 Observer, P.68TC Observer, P.68R, P.68, P.68C
- [TCDS 1A3](https://openairdocs.org/tcds/1A3): Bellanca Aircraft Inc.; names 7 of 7 models: 14-19-2, 17-31TC, 14-19-3, 17-30, 14-19-3A, 14-19, 17-31
- [TCDS A57EU](https://openairdocs.org/tcds/A57EU): GROB Aircraft SE; names 7 of 8 models: G115A, G115C, G115D, G115B, G115D2, G115, G115C2
- [TCDS A8SO](https://openairdocs.org/tcds/A8SO): Aviat Aircraft Inc.; names 7 of 7 models: S-2, S-2B, S-2A, S-2C, S-2S, S-1T, S-1S
- [TCDS A9EU](https://openairdocs.org/tcds/A9EU): Aermacchi S.p.A.; names 7 of 7 models: S.205 - 18/F, S.208, S.205 - 18/R, S.205 - 22/R, S.208A, S.205 - 20/R, S.205 - 20/F
- [TCDS 1A4](https://openairdocs.org/tcds/1A4): Piper Aircraft Inc.; names 6 of 6 models: PA-20, PA-20S-135, PA-20-135, PA-20S-115, PA-20-115, PA-20S
- [TCDS 7A15](https://openairdocs.org/tcds/7A15): Pilatus Aircraft Ltd.; names 6 of 15 models: PC-6/350-H1, PC-6, PC-6-H2, PC-6-H1, PC-6/350-H2, PC-6/350
- [TCDS A10EU](https://openairdocs.org/tcds/A10EU): Aermacchi S.p.A.; names 6 of 6 models: F.260F, F.260B, F.260E, F.260C, F.260, F.260D
- [TCDS A18EU](https://openairdocs.org/tcds/A18EU): Textron Aviation Inc.; names 6 of 6 models: FR172G, FR172J, FR172K, FR172E, FR172H, FR172F
- [TCDS 1A10](https://openairdocs.org/tcds/1A10): Piper Aircraft Inc.; names 5 of 6 models: PA-23-160, PA-23-235, PA-E23-250, PA-23-250 (Navy UO-1), PA-23
- [TCDS 1A21](https://openairdocs.org/tcds/1A21): Dynac Aerospace Corporation; names 5 of 5 models: Aero Commander 100A, Volaire 10, Aero Commander 100, Aero Commander 100-180, Volaire 10A
- [TCDS A-767](https://openairdocs.org/tcds/A-767): Univair Aircraft Corporation; names 5 of 5 models: 108, 108-3, 108-5, 108-1, 108-2
- [TCDS A-787](https://openairdocs.org/tcds/A-787): Univair Aircraft Corporation; names 5 of 8 models: M10, F-1A, F-1, A2-A, 415-D
- [TCDS A22NM](https://openairdocs.org/tcds/A22NM): Aviat Aircraft Inc.; names 5 of 5 models: A-1C-180, A-1C-200, A-1A, A-1B, A-1
- [TCDS A51EU](https://openairdocs.org/tcds/A51EU): Daher Aerospace; names 5 of 5 models: TB 200, TB9, TB 21, TB 20, TB 10
- [TCDS A67EU](https://openairdocs.org/tcds/A67EU): Extra Flugzeugproduktions- und Vertriebs- GmbH; names 5 of 5 models: EA 300/S, EA 300, EA 300/L, EA 300/200, EA 300/LC
- [TCDS 1A13](https://openairdocs.org/tcds/1A13): Revo Incorporated; names 4 of 7 models: Lake LA-4, Lake LA-4-200, Colonial C-1, Colonial C-2
- [TCDS 1A15](https://openairdocs.org/tcds/1A15): Piper Aircraft Inc.; names 4 of 4 models: PA-24, PA-24-260, PA-24-250, PA-24-400
- [TCDS 3A1](https://openairdocs.org/tcds/3A1): MICCO Aircraft Company; names 4 of 4 models: MAC-145B, MAC-125C, MAC-145, MAC-145A
- [TCDS 5A4](https://openairdocs.org/tcds/5A4): Textron Aviation Inc.; names 4 of 14 models: D50E-5990, B50, C50, 50

All 132: https://openairdocs.org/ad/2022-03-15/tcds.md

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 157,803 (157,803 by airframe model, 0 by engine model)
- Makers: Cessna 65,775, Piper 38,283, Beech 14,414, Cirrus Design 8,724, Mooney 6,256, Bellanca 2,633, Textron 2,261, Grumman American Avn. 1,663, Luscombe 1,472, Diamond Aircraft Ind 1,381

Models with the most aircraft:

- [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 4,258 aircraft (airframe model)
- [Cirrus Design SR22](https://openairdocs.org/model/cirrus-design-sr22): 4,018 aircraft (airframe model)
- [Cessna 172M](https://openairdocs.org/model/cessna-172m): 3,573 aircraft (airframe model)
- [Piper PA-28-180](https://openairdocs.org/model/piper-pa-28-180): 3,504 aircraft (airframe model)
- [Cessna 172N](https://openairdocs.org/model/cessna-172n): 3,138 aircraft (airframe model)
- [Cirrus Design SR22T](https://openairdocs.org/model/cirrus-design-sr22t): 3,075 aircraft (airframe model)
- [Piper PA-28-181](https://openairdocs.org/model/piper-pa-28-181): 2,935 aircraft (airframe model)
- [Cessna 182P](https://openairdocs.org/model/cessna-182p): 2,099 aircraft (airframe model)
- [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150): 2,054 aircraft (airframe model)
- [Cessna 172S](https://openairdocs.org/model/cessna-172s): 1,914 aircraft (airframe model)
- [Beech A36](https://openairdocs.org/model/beech-a36): 1,907 aircraft (airframe model)
- [Cessna 172](https://openairdocs.org/model/cessna-172): 1,805 aircraft (airframe model)
- [Cessna 152](https://openairdocs.org/model/cessna-152): 1,637 aircraft (airframe model)
- [Cirrus Design SR20](https://openairdocs.org/model/cirrus-design-sr20): 1,631 aircraft (airframe model)
- [Cessna 140](https://openairdocs.org/model/cessna-140): 1,603 aircraft (airframe model)
- [Cessna 182Q](https://openairdocs.org/model/cessna-182q): 1,565 aircraft (airframe model)
- [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 1,497 aircraft (airframe model)
- [Cessna 150L](https://openairdocs.org/model/cessna-150l): 1,447 aircraft (airframe model)
- [Cessna 150M](https://openairdocs.org/model/cessna-150m): 1,439 aircraft (airframe model)
- [Mooney M20J](https://openairdocs.org/model/mooney-m20j): 1,408 aircraft (airframe model)

All 914 models: https://openairdocs.org/ad/2022-03-15/models.md
Every aircraft: https://openairdocs.org/ad/2022-03-15/aircraft.md

## Related documents

- [Proposed rule FAA-2021-0715](https://openairdocs.org/proposed/FAA-2021-0715): Notice of proposed rulemaking (NPRM), published Aug 27, 2021
- [STC SA01899WI](https://openairdocs.org/stc/SA01899WI): Installation of Garmin G3X Touch Electronic Flight Instrument System. Garmin International Inc., Named in the applicability
- [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc., Named in the applicability

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