Garmin has received FAA STC approval for installation of the G5 electronic flight instrument to replace directional gyros and horizontal situation indicators (or add HSI capability) in type-certified general aviation fixed-wing aircraft. This means that the more than 600 airplane models that are on Garmin’s approved model list STC are now eligible to install either a single G5 in the attitude, DG, or turn coordinator position or dual G5s in any two of those positions. Typically, one G5 will replace the attitude indicator—this configuration was approved last year—then another is installed below that to replace the DG. The G5 in the DG position can be reverted to display attitude if the attitude indicator fails.

The G5 includes a built-in four-hour backup battery as well as its own ADAHRS sensor package, so two G5s would provide a great deal of redundancy. They also eliminate the need for a vacuum system to drive gyroscopic instruments. The G5 fits into a standard 3.125-inch instrument panel hole and is three inches deep, including the backup battery. 

According to Garmin, “ When paired with select VHF navcoms or GPS navigators the G5 can be considered primary for displaying magnetic heading, VOR/LOC guidance and/or GPS course guidance, as well as distance and groundspeed.” The G5 also displays magnetic heading when paired with Garmin’s magnetometer, which can drive two G5 displays. There are no restrictions on flight operations with the G5, and it is approved for VFR and IFR. 

G5 prices start at $2,449, and that includes the installation kit, magnetometer, backup battery and STC. The adapter to connect the G5 to compatible avionics is additional, and with the adapter the G5/HSI retails for $2,975. Dual G5s start at $4,598. Deliveries of the newest G5 begin in May.