Maintenance and Modifications
Blackhawk Wins Garmin GI 275 STC for 500-series Citations
Install provides for a lower-cost, more reliable electronic standby instrument system
Cessna Citation with Garmin GI 275 ESIS
Blackhawk's STC for the Garmin GI-275 ESIS applies to all Citation serial numbers. © Blackhawk Aerospace

Blackhawk Aerospace Technologies (BAT) has completed the supplemental type certificate (STC) for the installation of the Garmin GI 275 electronic standby instrument system for the Cessna Citation 500/501/550/S550/560/560XL series jets. According to the Columbia, Missouri-based company, the approved model list STC applies to all serial numbers of these Citation models.

Blackhawk said the upgrade offers a less expensive and easily installed alternative—along with a provided PMA kit—to the costly and difficult-to-repair original standby instrument system. The STC allows the option for use of an internal lithium-battery-powered GI 275 or the existing standby battery system.