User Guide

Series III Avionics
Pilot's Guide
Page 41
Operating the DMS-44A
1. Apply power to the DMS-44A (depending on installation, the power-on switch may be an avionics
master switch, radio switch, or a dedicated DME switch). The SD-442B display(s) will come on
immediately, displaying either data, dashes (flag condition) or the word FAIL.
2. Select a NAV Receiver to control the DM-441B by pressing the NAV pushbutton to display a 1, 2, or
RNAV.
3. To operate the DMS-44A, set the NAV Receiver controlling the DMS-44A to any VHF navaid station
within line-of-sight range that has a DME (VOR/ DME, VORTAC, ILS/DME, LOC/DME, MLS/DME).
4. To use the SD-442B Selector Display as a repeater of RNAV-computed ground speed and distance
to the next RNAV-designated waypoint, press the NAV pushbutton to display RNV.