TM 1-1510-218-10
3C-81
c. Power Control.
(1) FMS -800 System Power. All FMS-800
units operate from + 28 Vdc aircraft essential bus
power. Power is provided through a 5 amp CB
placarded FMS 1 on the right side circuit breaker
panel.
(2) CDU
Power
Control
of
Associated
Subsystems. Using the CDU, the crew can control the
power on/off state of the avionic subsystems managed
by the FMS-800. Whenever a unit is powered off, the
CDU shows dashes for the data normally supplied by
that unit. Attempts by the flight crew to control that
subsystem is inhibited and results in a POWER
message in the scratchpad.
(3) CDU Power Control Procedures. On
Index 1 page, pressing the POWER line select key
displays the Master Power page. Refer to Figure
3C-26 and Table 3C-18. This page permits on/off
control of individual communication or navigation
radios. It also provides a RADIO MASTER selection
which turns the controlled radio on or off.
d. System Initialization.
(1) Initialization Overview. The FMS-800
system preflight initialization includes confirming or
entering the current position, time, and date for GPS
initial acquisition. It also verifies the cartridge
effectivity date of the data loader cartridge and the
erasing or loading of flight plan and mission data.
(2) Initialization Procedures. A normal
preflight startup procedure follows.
1. Verify or enter position, time, date,
and chart datum on the Start 1 page.
Refer
to
Figure
3C-27
and
Table 3C-19. Normally the GPS will
provide the correct position, time, and
date shortly after the GPS power is
turned on.
Figure 3C-26. Master Power Page
Table 3C-18. Master Power Page Procedure
NO.
DESCRIPTION/FUNCTION
1
Select index 1 page.
2
Access Master Power page.
3
To set all communication radio power to
ON.
4
Toggle individual unit power ON or
OFF.
5
To set all communication radio power to
OFF (requires confirmation).
