Regulations & Safety
Garmin GHA 15 Height Advisor Receives FAA Approval for Certified Aircraft
Garmin’s GHA 15 Height Advisor, a radar-based altitude device, gains FAA approval for over 500 certified aircraft models, enhancing general aviation safety.
This article is based on an official press release from Garmin.
Garmin has announced that its GHA 15 Height Advisor, a radar-based altitude monitoring device, has received Federal Aviation Administration (FAA) Supplemental Type Certificate (STC) approval. Previously available only for the experimental market, this certification allows the installation of the device in over 500 models of Class I and Class II certified aircraft.
The approval marks a significant shift in the accessibility of radar altimetry for general aviation pilots. According to the company, the GHA 15 is available immediately at a price of $2,695. This pricing strategy positions the device as a cost-effective alternative to traditional radar altimeters, which have historically been priced significantly higher and reserved for business jets or commercial airliners.
The GHA 15 is designed to provide pilots with precise Height Above Ground Level (AGL) readings during the critical final phases of flight. While standard barometric altimeters rely on air pressure and can be subject to calibration errors or terrain variations, the GHA 15 uses radio frequency technology to measure the actual distance between the aircraft and the ground.
Garmin states that the device is capable of providing AGL data from 500 feet down to the surface. The system integrates with the Garmin GI 275 electronic flight instrument to display altitude data and generate audible callouts directly to the pilot’s headset. These callouts, such as “50 feet,” “20 feet,” and “10 feet”, are user-configurable and intended to assist pilots in judging flare height and landing timing.
“The GHA 15 provides a cost-effective solution that helps reduce pilot workload and provides confidence during the approach and landing phases of flight.”
, Garmin Press Release
The unit is a compact, all-in-one module that mounts to the underside of the aircraft fuselage. Weighing less than one pound (approximately 0.45 kg), the device is roughly the size of a deck of cards, minimizing the structural impact of installation. According to the technical details released by Garmin, the GHA 15 offers the following accuracy levels:
The FAA STC covers a broad range of single-engine and twin-engine piston aircraft (Class I and Class II). This includes popular general aviation airframes such as the Cessna 172, Piper PA-28, Beechcraft Bonanza, and Mooney M20 series. To function, the GHA 15 must be interfaced with a Garmin GI 275 electronic flight instrument. For experimental aircraft, the device remains compatible with the G3X Touch flight display.
The certification of the GHA 15 represents a notable development in the “democratization” of avionics safety features. Historically, radar altimeters (such as the Garmin GRA 55) have cost upwards of $7,000, placing them out of reach for the average private pilot. By offering a certified “Height Advisor” for under $3,000, Garmin is effectively bridging the gap between recreational flying and professional-grade situational awareness. We believe this technology will be particularly valuable in three specific scenarios:
It is important to note the distinction Garmin makes by labeling this product a “Height Advisor” rather than a TSO-certified radar altimeter. While it provides similar functionality, it is intended for advisory purposes and does not replace the higher-end equipment required for complex instrument approaches like CAT II or CAT III landings.
Sources: Garmin
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Photo Credit: Garmin