Our highest quality and most common Compass System (HSI) is the Bendix/King KCS-55A. This is a four part system, consisting of:

• KI-525A Pictorial Navigation Indicator
• KG-102A Directional Gyro
• KMT-112 Flux Detector
• KA-51A / KA-51B Slaving Accessory

The KI-525A is the most visible component, and what people tend to mean when they talk about an HSI. This indicator shows both your heading and course information on the same display. It may be interfaced with an Autopilot or Flight Director. It also has dual Glideslope indications that appear when flying a precision (ILS or WAAS GPS) approach.

The KI-525A is available with a bootstrap output to allow other displays (Stormscope, Moving Map, ADF card, etc.) to be slaved to the current heading. The version of the KCS-55A shown here does not have a bootstrap output.

The cost savings of omitting the bootstrap are relatively minor. If you think you will ever need this capability, it makes sense to get the bootstrap output now.

The course information displayed on the KI-525A may come from a variety of sources, including a GPS. The following NAV Receiver / RNAV Navigation Systems are also compatible with the KI-525A:

• Garmin GNS-430
• Garmin GNS-430W WAAS GPS
• Garmin GNS-530
• Garmin GNS-530W WAAS GPS
• Garmin GNS-480 / CNX-80 WAAS GPS
• Garmin GTN-650 WAAS GPS
• Garmin GTN-750 WAAS GPS
• KX-165 NAV/COMM - 14V or 28V
• KX-165A NAV/COMM
• KX-155 NAV/COMM (with an external VOR/LOC Converter) - 14V or 28V
• SL-30 NAV/COMM
• KNS-80 NAV/RNAV/DME/Glideslope
• KNS-81 NAV/RNAV/Glideslope
• VIR-351 NAV
• and more... Contact us for compatibility

The King KCS-55A Compass System (HSI) is available in either Serviceable or Overhauled condition. We strongly recommend the Overhauled option, as shown here. Unlike many other avionics items, there are (in both the KI-525A and KG-102A Gyro) high-speed moving parts that will wear over time. Having a system Overhauled will ensure the reliability you expect from an important and expensive system. Overhauled systems come with a 6 month warranty.

We do not typically stock Overhauled KCS-55A systems because the "clock" would start on the overhaul warranty. Instead, we will have an HSI overhauled for you to get you a fresh inspection and full warranty period. Please allow 1-2 weeks before shipping. (If you need a KCS-55A quickly, please contact us to see what options we can offer.)

If you have any questions about this item, please click to send us an email.