The MD23-3PACK is a digital instrument suite of 3 essential gauges: Airspeed Indicator, Attitude Indicator, and Counter Drum Encoding Altimeter.The new, digital standby family features the company's Attitude Indicator, Counter Drum Encoding Altimeter, and Airspeed Indicator. All three instruments are supported by an AML STC covering more than 180 aircraft models. The Digital Attitude Indicator, Counter Drum Encoding Altimeter, and Airspeed Indicator feature smooth, daylight-readable LCD graphics and a simple user interface. They are FAA TSO certified, RTCA DO-160G qualified, and RTCA DO-178C qualified to Design Assurance Level A.