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NEW 2-inch Digital Instruments

FLEX® Digital Counter Drum Encoding Altimeter

The MD23-215 features smooth, high-resolution graphics and operating range of up to 55,000 feet. It offers user-selectable vertical speed indication and — for the first time — user-selectable 6-second vertical trend.

SSEC customization and Night Vision Imaging System (NVIS) compatible versions are available.

FLEX® Digital Counter Drum Encoding Altimeter

Users Select


  • Vertical speed indicator (ON/OFF)
  • 6-second vertical trend (ON/OFF)
  • Altitude target (ON/OFF)
  • Approach Minimums alert (ON/OFF)
  • Barometric setting (millibars, hectopascals or inches of mercury)


  • Operating range up to 55,000 feet
  • Configurable altitude units (feet or meters)
  • Baro setting synchronized via ARINC 429
  • Encoding outputs via ARINC 429 and Gray Code
  • Standard 2-inch size
  • Lightweight — 0.4 lbs
  • Simple user interface — Single, push-and-turn control knob
  • Daylight readable LCD and smooth, high-resolution graphics
  • Manual external lighting control or built-in photocell for automatic dimming
  • SSEC curve customized to match primary flight displays (available)
  • Night Vision Imaging System (NVIS) compatible (available)
  • TSO certified (Design Assurance Level A)
  • Designed and built in Wichita, Kansas, USA
  • Two-year limited warranty
Power Input
10–32 VDC
0.14A @ 28 VDC; 4 watts nominal
Data Input
ARINC 429: Low or high speed; Labels 234, 235
Pressure: Absolute/Static (Quick Disconnect)
Data Output
ARINC 429: Low or high speed; Labels 203, 204, 212, 217, 234, 235
Gray Code
Operating Range
-1,500 to +55,000 feet
Units of Measure
Altitude: Feet or meters
Barometric Setting: Millibars (mb), hectopascals (hPa) or inches of mercury (in.Hg)
5, 14, or 28 VDC external control or internal photocell for automatic dimming
0.4 lbs (0.17 kg)
Rear panel mounted, (4) #6–32 screws, 2.25-inch round bezel
2.43 x 2.43 x 1.0 inches
(61.7 x 61.7 x 25.4 millimeters)
Mating Connector
P/N 9019162-1: 26-pin, D-Sub electrical connector (Quick Disconnect)
P/N 9019162-2: Pneumatic fitting (Quick Disconnect)
FAA/EASA TSO certified to C10c, C106, C113b
RTCA DO-160G qualified
RTCA DO-178C qualified, Design Assurance Level (DAL) A
U.S. Patent 11,048,389
FLEX® Custom Triple Indicator