Flex® Annunciation Control Unit

The Flex® Annunciation Control Unit (ACU) is an intelligent LCD annunciator that provides critical status and health information for up to two Gen5 lithium-ion batteries. The ACU monitors the battery and provides status, state of charge, volts, amps, temperature, remaining life, capacity and faults. View all Battery Accessories
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MD23-1004 Flex Annunciation Control Unit thumb
MD23-1004 Flex Annunciation Control Unit thumb


  • Standard 2-inch size
  • Lightweight — 0.4 lbs
  • Simple user interface — Push-and-turn control knob
  • Daylight readable LCD and high-definition graphics
  • External lighting control and built-in photocell for automatic dimming
  • Field-upgradeable software via standard USB-A port
  • TSO-certified hardware and software (Design Assurance Level A)
  • Designed and built in Wichita, Kansas, USA
  • Two-year warranty


Model Number Flex MD23-1004
Part Number 6420023-1
Data Input ARINC 429
Data Output ARINC 429
Battery Rechargeable coin cell (memory only)
Weight 0.4 lbs (0.17 kg)
Mounting Rear panel mounted, (4) #6–32 screws, 2.25-inch round bezel
Dimensions 2.43 x 2.43 x 1.0 inches
Mating Connector P/N 9019162-1 (26-pin D-Sub and backshell}
Certification FAA/EASA TSO certified to C2d (Type B), C10c, C106, C113b
RTCA DO-160G qualified
RTCA DO-178C qualified, Design Assurance Level (DAL) A
Rights U.S. Patent 11,048,389


Installation Manual
IM 9019161

Technical Drawing
OL 6420023

User Guide


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Questions?    316.630.0101    800.821.1212