SEA News 2021


Southeast Aerospace has partnered with Garmin International, Inc. to develop a cost-effective solution to replace instantaneous vertical speed indicators (IVSI) and electronic standby instrument (ESI) units in Part 25 aircraft by utilizing Garmin’s GI 275 Electronic Flight Instrument. Lightweight and compact, the GI 275 is intentionally designed to take advantage of the common 3.125-inch flight instrument size, reducing installation time and preserving the existing aircraft panel. The GI 275 is available in both an IVSI and ESI version.

Garmin GI275

Two separate Approved Model List (AML) Supplemental Type Certificates (STCs) are in development by Southeast Aerospace. The IVSI AML STC was created to provide a cost-effective alternative to repairing or replacing the estimated 6000 Honeywell IVA-81A/D units currently installed in Part 25 aircraft. The IVA-81A/D units are becoming obsolete with high repair costs and increasingly lower reliability. The GI 275 offers the opportunity to upgrade to a lighter, brighter, current production unit with future upgrade options and continued support. An adapter plate and pre-built harness will also be available to provide quick-turn, in-the-field upgrades for AOG situations.

The ESI AML STC was created to offer a much lower-cost option to replace pre-existing, obsolete, higher-cost ESI and Electromechanical Standby Instruments with Garmin’s current production GI 275 configured as an ESI. The GI 275 is set up as an ADI to include airspeed and altimeter with optional heading display and optional synthetic vision display available. This new STC along with PMA kits are being designed to allow the SEA approved Garmin dealer to install the GI 275 ESI on any aircraft on the AML.

“We’re thrilled to work with Southeast Aerospace on this STC which will provide the GI 275 IVSI and ESI replacement for a variety of Part 25 aircraft,” said Carl Wolf, Garmin vice president, aviation sales and marketing. “The GI 275 upgrade will offer operators a modern and cost-effective replacement solution to avoid the high repair costs and ongoing obsolescence associated with legacy IVSI and standby systems on these aircraft.”

Luke Gomoll, Aircraft Modifications Sales Representative, stated, “Replacing only the equipment that face obsolescence, not entire systems (such as a TCAS II system) will allow these aircraft to operate safely, more frequently, and for less expense over time – long into the future. As an ESI, the Garmin GI 275 will bring incredible new features to the cockpit, only dreamed about just a few years ago.”

Garmin GI275 STCS Panal

Southeast Aerospace’s Part 25 AML IVSI and ESI STCs will be available for an expansive list of business aviation aircraft to include Learjets, Citations, Hawkers, Gulfstreams, Challengers, Falcons, Sabreliners, and more.

Southeast Aerospace is expecting to receive Federal Aviation Administration (FAA) approval for both the IVSI and ESI AML STC by Q2, 2022.

For more information please visit or contact Aircraft Modification Representative, Luke Gomoll,

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