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MD23-190 

 

User Guide 

Mid-Continent Instruments and Avionics 

User Guide UG190, Revision 2 

 

 

January , 2021 

1.1 

INTRODUCTION 

The model MD23-190 multifunction clock is a standard 2-inch (2-

¼”) panel-mounted instrument 

that displays time, with or without an ARINC input for GPS synchronization, and offers several 
timers and related time functions. Based on Mid-Continent Instruments and Avionics patented 
FLEX

TM

 Custom Function Display, this FAA and EASA TSO-approved instrument brings a highly 

capable and modern addition to the cockpit to display required information and provide useful 
supplementary functions.  

This User Guide is a supplement to the Installation Manual and Operating Instructions (IM), 
MCIA part number 9019161. The IM contains all information associated with the standard 
product, including installation procedures, product specifications, operating instructions, 
certification data, and maintenance requirements. This User Guide provides additional 
information associated with the specific features of the multifunction digital counter drum 
altimeter. It addresses product identification, electrical pinout, initial configuration setup, and in-
flight user operation.  

1.2 

PRODUCT IDENTIFICATION 

Each MD23 is comprised of certified hardware and certified software. Within the context of the 
certified software is a set of data items that can configure and customize the behavior of the unit. 
This set of data is referred to as a Custom Instrument Definition, or a CID file. The CID file for 
this instrument is pre-loaded and may be available for future updates via a standard USB flash 
drive through the programming port on the rear of the unit. 

A unique CID number has been assigned specifically to this application. The CID is identified by 
its two-digit number and an alphabetic character representing the CID versi

on, starting with “A”.  

The identification of the hardware, software, and CID configurations are listed below. Both the 
software version and the CID can be viewed on the Introduction Screen during the first few 
seconds of applying power to the unit. This information can also be accessed on the Info page of 
the Options Menu during Flight Mode.  

 

 

 

1.3 

PRODUCT FUNCTION 

The CID identified within this User Guide is designed as a multi-function clock. It displays UTC 
time and Local time and contains multiple timers such as count up, count down, and Elapsed 
Flight time. It can receive ARINC 429 inputs to provide time synchronization with a GPS source 
and Estimated Time to Waypoint. The highly accurate internal clock maintains time to ±2 minutes 
per year when not sync’d, including a 10-year internal battery to keep time when the unit is 
powered off. Additional Hobbs and Run timers track usage over the life of the product with the 
Flight and Hobbs timers capable of being triggered via an external signal. The clock can also 
output currently displayed time via ARINC to external equipment.  

 

Unit Versions 

Hardware Part Number 

Software Version 

CID 

6420023-1 

1.0.2, or later 

90A, or later 

Summary of Contents for MidContinent MD23-190

Page 1: ...ent regulatory requirements are qualified to install this equipment It is a supplement to the MD23 Installation Manual and Operating Instructions p n 9019161 If further information is required please...

Page 2: ...set of data is referred to as a Custom Instrument Definition or a CID file The CID file for this instrument is pre loaded and may be available for future updates via a standard USB flash drive through...

Page 3: ...tement of work and are not provided within this User Guide Connector Pinout Pin Description Function 1 Ground Power return connect to a c ground 2 ARINC Out A ARINC label 150 3 ARINC Out B paired with...

Page 4: ...t MANUAL to start and stop the Flight Timer manually o select EXTERNAL to start the timer on an open signal Timer stops when grounded Hobbs Timer Pre Set to coincide with the existing aircraft engine...

Page 5: ...the unit is initially powered on the Middle Pane is blank LOWER PANE The Lower Pane shows the current active value of all four timer functions and allows any of them to be selected for an expanded vie...

Page 6: ...OP and RESET the timer manually by scrolling to and selecting the desired action If RESET is selected without first selecting STOP the timer will reset to zero and continue counting When the Flight Ti...

Page 7: ...mer running Count down Timer T When the Count down Timer is selected from the Lower Pane the Lower Pane and Middle Pane will show HH MM SS The user can SET START STOP and RESET the timer manually by s...

Page 8: ...ARINC input T Count up Stopwatch function with manual start stop reset T Count down Count down timer from user set value with manual start stop reset counts up after reaching zero 4 1 3 USER OPTIONS...

Page 9: ...set to a different time than the GPS time even when GPS time is available In this case the time basis will continue to be synchronized but the manual UTC time will be stored and remembered as an offs...

Page 10: ...ser to choose whether the seconds HH MM SS are shown ON or not shown OFF on the main display for both the time UTC and LOCAL and the Flight Timer This feature is to reduce clutter or distraction per u...

Page 11: ...Hobbs timer if enabled via external signal 5 1 CONFORMANCE For standard conformance items such as qualification levels and software updates please refer to the IM 5 1 1 INSTRUCTIONS FOR CONTINUED AIR...

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