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Garmin G5 Installation Guide — What Pilots Need to Know Before Upgrading
Planning a Garmin G5 installation? The important questions are not just which display to buy. You also need to verify the applicable STC and AML, choose the correct G5 configuration, identify required accessories, check autopilot and navigator interfaces, and make sure the installer has the current Garmin documentation.
Quick Answer: What Do You Need for a Garmin G5 Installation?
For a certified aircraft, a Garmin G5 installation must follow the applicable approved installation data. Garmin’s Part 23 AML STC SA01818WI covers approved aircraft and G5 installation configurations. You should verify your specific aircraft against the current Approved Model List before purchasing equipment.
The exact equipment package depends on the installation. A G5 installation may involve the G5 electronic flight instrument, an approved battery pack, installation hardware, pitot/static connections, and—depending on the configuration—components such as the GMU 11 magnetometer, GAD 29/GAD 29B data bus converter, GPS antenna, or GAD 13/OAT equipment.
Do not choose the equipment package solely from a generic shopping list. Confirm the configuration and approved interfaces against the current Garmin installation documentation and the aircraft’s specific approval basis.
What Is the Garmin G5?
The Garmin G5 Electronic Flight Instrument is a compact electronic flight instrument designed to replace certain traditional electromechanical flight instruments in approved installations.
In certified-aircraft installations, the G5 can be used in approved attitude, directional gyro, horizontal situation indicator, or related configurations depending on the aircraft, installation data and STC configuration.
Garmin’s certified G5 system uses an approximately 3-1/8-inch instrument format, allowing it to fit the standard instrument cutout used by many general-aviation aircraft. The fact that the display physically fits the panel, however, does not by itself establish that the installation is approved.
Garmin G5 Installation Manual: Where to Start
If you are searching for the Garmin G5 installation manual or G5 installation manual, start with Garmin’s current documentation rather than an unofficial copy or an old installation guide.
Garmin’s current Part 23 AML STC installation manual is 190-01112-10. The current version available from Garmin is Rev. 20. It covers the installation of G5 equipment under STC SA01818WI and identifies the equipment and interfaces approved by that STC.
The manual should be treated as installation data—not simply as a consumer setup guide. It contains limitations, equipment information, wiring and interface requirements, configuration information and aircraft-specific installation considerations.
View Garmin G5 Installation Manual Garmin G5 STC RegistrationGarmin G5 STC SA01818WI Explained
For many certified Part 23 aircraft, the Garmin G5 installation is supported by Supplemental Type Certificate SA01818WI. The STC is associated with Garmin International and uses an Approved Model List (AML) to identify eligible aircraft.
The important point is that the STC does not mean that every aircraft can automatically receive a G5 installation.
| Question | What You Need to Verify |
|---|---|
| Is my aircraft eligible? | Check the current Garmin AML for the applicable aircraft make, model and serial-number range. |
| Which G5 configuration? | Determine whether the installation calls for an attitude, DG/HSI or other approved configuration. |
| Are existing modifications compatible? | The installer must determine compatibility with previously approved modifications and the aircraft’s existing configuration. |
| Which interfaces are approved? | Verify the specific autopilot, navigator and other interfaces against the current installation data. |
How to Check the Garmin G5 Approved Model List
One of the most important steps before buying a G5 for a certified aircraft is checking the AML.
Do not rely solely on statements such as “G5 fits Cessna 172” or “G5 works with Piper PA-28.” The correct question is whether the specific aircraft configuration and applicable serial-number range are covered by the current approved data.
Before ordering, collect these details:
- Aircraft manufacturer — for example, Cessna, Piper, Beechcraft, Mooney or another approved manufacturer.
- Aircraft model — include the exact model and variant.
- Aircraft serial number — important when AML coverage is limited to specific serial-number ranges.
- Existing avionics — especially autopilot, navigator, heading system and other equipment connected to the instrument being replaced.
- Existing modifications — including previously approved STCs or other alterations that may affect compatibility.
Garmin G5 Attitude vs DG/HSI Configuration
The G5 system can be configured for different approved functions. The exact configuration matters because the associated equipment, interfaces and installation requirements can change.
| Configuration | Primary Function | Important Consideration |
|---|---|---|
| G5 Attitude | Electronic attitude display for an approved attitude-instrument installation. | Follow the applicable installation limitations and required backup/instrument configuration. |
| G5 DG/HSI | Approved directional/heading or navigation display functions depending on the installation. | A GMU 11 magnetometer may be required for magnetic-heading functions. |
| Dual G5 installation | Uses more than one G5 for an expanded approved instrument configuration. | The complete installation must follow the applicable STC, aircraft configuration and installation documentation. |
What Equipment May Be Required for a Garmin G5 Installation?
The G5 display is only one part of a complete installation. Garmin’s installation documentation identifies associated equipment that may be used depending on the configuration.
| Component | Purpose | When It May Be Needed |
|---|---|---|
| G5 Electronic Flight Instrument | Main electronic flight instrument. | Required as the central G5 unit in the applicable installation. |
| G5 battery pack | Provides backup power for applicable G5 configurations. | Follow the applicable STC and installation requirements. |
| GMU 11 magnetometer | Provides magnetic-field/heading reference information. | Required in applicable DG/HSI installations. |
| GAD 29 / GAD 29B | Data-bus interface for approved navigation and autopilot applications. | Depends on the approved interface and equipment installed in the aircraft. |
| GPS antenna | Provides an approved GPS source where required by the installation. | Depends on the aircraft’s existing approved GPS/navigation equipment. |
| GAD 13 / OAT equipment | Provides outside-air-temperature interface capability. | Optional or configuration-dependent. |
Garmin’s current installation manual lists the approved G5, installation kit, battery pack, GMU 11, GAD 29/GAD 29B and other associated equipment under the applicable STC. :contentReference[oaicite:1]{index=1}
Garmin G5 Battery Backup: What You Need to Know
Battery backup is an important part of the certified G5 installation. The applicable requirements depend on the G5 configuration and approved installation.
Garmin’s documentation identifies an approved G5 battery pack as part of the STC equipment. The maintenance documentation also contains requirements for checking and maintaining the battery system.
Why the backup battery matters
- Provides an independent backup power source for applicable G5 installations.
- Helps maintain G5 operation during an aircraft electrical-power interruption.
- Requires maintenance and inspection according to Garmin’s applicable documentation.
- Should be considered when budgeting for long-term ownership and maintenance.
Garmin G5 Autopilot and Navigator Interfaces
One of the most common G5 installation questions is whether the aircraft needs a GAD 29B.
The answer depends on what the G5 is being connected to. Garmin’s installation manual states that the GAD 29B is required in installations that use G5 heading/course output to an autopilot or interface the G5 with a Garmin navigator. :contentReference[oaicite:2]{index=2}
| Installation Situation | GAD 29B Question |
|---|---|
| Standalone G5 with no applicable external interface | A GAD 29B may not be required. Confirm against the exact installation. |
| G5 heading/course output to an approved autopilot | GAD 29B or another approved interface may be required depending on the system configuration. |
| Interface with an approved Garmin navigator | Verify the applicable GAD 29/GAD 29B requirement in the current Garmin installation documentation. |
| Existing non-Garmin autopilot | Confirm the specific autopilot is an approved interface before buying interface hardware. |
Garmin G5 Installation Process: What to Expect
A G5 installation in a certified aircraft is not simply a matter of removing one instrument and plugging in another. The installer needs to establish aircraft eligibility, follow the applicable installation data, connect the required systems and complete the required testing and records.
1. Verify Aircraft Eligibility
Confirm the aircraft make, model and serial number against the current AML and identify any existing modifications that could affect compatibility.
2. Select the Correct Configuration
Determine whether the installation requires an attitude, DG/HSI, dual or another approved configuration.
3. Identify Required Equipment
Determine whether the installation requires the battery pack, GMU 11, GAD 29/GAD 29B, GPS antenna, OAT equipment or other approved components.
4. Remove Existing Instrument
The installer removes the existing instrument and evaluates the panel, wiring, pitot/static connections and existing avionics interfaces.
5. Install and Connect the G5
Electrical, pitot/static, GPS, magnetometer and data-bus connections are completed according to the applicable installation documentation.
6. Configure and Test
The installed system is configured and tested, including applicable sensor, interface, heading and backup-power functions.
7. Complete Required Records
The installer completes the applicable aircraft maintenance records and installation documentation required for the approved installation.
8. Return the Aircraft to Service
The aircraft is returned to service only after the applicable installation, inspection, testing and documentation requirements have been satisfied.
Garmin G5 Pitot/Static Installation Considerations
Some G5 installations connect to the aircraft’s pitot/static system. That means the installation can involve more than electrical wiring and panel mounting.
The installer must follow the applicable Garmin installation data and the aircraft’s regulatory requirements for pitot/static systems.
Garmin G5 Software and Current Documentation
The G5 is software-controlled equipment, so software version and documentation revision can matter during maintenance and installation.
Garmin issued a 2026 service bulletin for G5 Software Version 8.70 for installations under Part 23 AML STC SA01818WI. Garmin’s bulletin identifies STC MDL Revision 34 and notes that the applicable maintenance manual and flight manual supplement revisions should be provided to the aircraft operator/owner before return to service following the affected update. :contentReference[oaicite:3]{index=3}
This is a good reason to avoid relying on an old downloaded installation manual or outdated forum instructions. Always verify the current Garmin documentation applicable to the aircraft and software version.
View Garmin G5 Software InformationWhat to Verify Before Buying a Garmin G5
Before ordering a G5, give your avionics installer the aircraft and existing-equipment information needed to establish the correct package.
- Aircraft make and model: Identify the exact aircraft rather than relying on a generic compatibility list.
- Aircraft serial number: Verify the applicable AML range.
- Existing attitude/heading instruments: Identify what the G5 is replacing.
- Autopilot: Provide the exact autopilot model if an interface is required.
- Navigator: Identify existing Garmin or other navigation equipment.
- G5 configuration: Confirm attitude, DG/HSI or other approved configuration.
- Required accessories: Confirm the battery, GMU 11, GAD 29/GAD 29B and other applicable components.
- Documentation: Make sure the equipment and installation package includes the documentation required for the intended certified installation.
- Software: Confirm the applicable current approved software and documentation revision.
Shop Garmin G5 Equipment
Jet Aviation Spare Parts carries Garmin G5 equipment and related aviation avionics. Product configuration and included accessories should be confirmed before ordering for a certified-aircraft installation.
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Garmin G5 Installation FAQs
Do I need an STC to install a Garmin G5 in a certified aircraft?
For certified aircraft installations covered by Garmin’s Part 23 AML STC, the installation must follow the applicable STC and approved installation data. Verify that the specific aircraft is covered by the current AML before purchasing.
What is Garmin G5 STC SA01818WI?
SA01818WI is Garmin’s Part 23 AML Supplemental Type Certificate covering approved installations of the G5 Electronic Flight Instrument in listed aircraft.
Where can I find the Garmin G5 installation manual?
Garmin provides the Part 23 AML STC installation manual through its official documentation and support resources. The current manual identified for the installation is Garmin document 190-01112-10.
What is the Garmin G5 installation manual part number?
The Garmin G5 Part 23 AML STC Installation Manual is 190-01112-10. Always verify that you are using the current Garmin revision applicable to the installation.
Do I need a GAD 29B for a Garmin G5?
Not necessarily. Garmin states that the GAD 29B is required for installations that use G5 heading/course output to an autopilot or interface with a Garmin navigator. The exact requirement depends on the approved system configuration.
Does the Garmin G5 require a GMU 11?
The GMU 11 magnetometer is used in applicable G5 installations that require magnetic heading information, including applicable DG/HSI configurations. Verify the exact requirement against the current installation data.
Can the Garmin G5 replace a traditional attitude indicator?
Yes, the G5 can replace certain traditional flight instruments in approved configurations. However, the exact replacement function and any instruments that must remain installed are determined by the applicable STC and installation configuration.
Can the Garmin G5 replace a directional gyro?
The G5 can be installed in approved DG/HSI configurations. The exact function, required magnetometer and other interfaces must follow the applicable Garmin installation data.
Can I install a Garmin G5 myself?
For a certified aircraft, installation must be accomplished and approved in accordance with the applicable regulations, approved data and the authorization of the person or organization performing the work. Consult an appropriately authorized aircraft maintenance or avionics professional for the specific installation.
Does the G5 work with every autopilot?
No. The G5 installation manual identifies approved interfaces and configurations. The exact autopilot model should be checked against current Garmin installation data before purchasing an interface adapter.
Does a Garmin G5 installation affect the pitot/static system?
Some G5 installations connect to the aircraft pitot/static system. The installer must follow the applicable Garmin installation data and satisfy the aircraft’s applicable inspection and certification requirements.
What software does the Garmin G5 use?
Certified G5 installations use approved Garmin software. Garmin has continued to update the G5 under STC SA01818WI; for example, Garmin published a 2026 bulletin approving G5 software version 8.70 for affected installations. Always verify the current approved version before updating a certified installation.
What should I give my avionics shop before ordering a G5?
Provide the aircraft make, exact model, serial number, existing autopilot, navigator, current flight instruments and any known modifications. This allows the installer to determine the correct configuration and required equipment before the order is placed.
Official Garmin and FAA Resources
For a certified G5 installation, use the current manufacturer’s installation data and applicable FAA approval information.
Bottom Line: What You Need Before Installing a Garmin G5
The Garmin G5 can be a significant upgrade for a general-aviation aircraft, but the correct installation starts with the approval basis, not the shopping cart.
First verify the aircraft against the applicable AML. Then determine the required G5 configuration, existing autopilot and navigator interfaces, required accessories, pitot/static connections, software and current installation documentation.
If you are buying the equipment yourself, give the complete aircraft information to your avionics installer before ordering. That helps prevent purchasing a G5 configuration or accessory package that does not match the intended installation.
Ready to Check Your Garmin G5 Installation?
Browse Garmin G5 equipment and related Garmin aviation systems from Jet Aviation Spare Parts. Before ordering for a certified aircraft, confirm the exact configuration and documentation requirements with your avionics installer.
Shop Garmin G5 Browse Garmin Aviation SystemsImportant: This article is for general informational purposes and is not a substitute for Garmin’s current installation documentation, the applicable STC or AML, FAA regulations, approved aircraft maintenance data, or advice from an appropriately authorized aviation professional. Aircraft configurations, approved interfaces and documentation requirements can vary. Always verify the current requirements applicable to your specific aircraft and installation.