2 POS This field displays the last
present position coordinates at loss of power. These
coordinates are stored in non-volatile memory.
3 GMT OFF This field displays the
actual GMT of power loss.
4 MINUTES OFF. This field displays
the total time elapsed during power off.
5 LAST TK. This field displays the
last aircraft track at time of power off.
6 LAST GS. This field displays the
last groundspeed at time of power off.
(5) Obsolete Waypoint. Obsolete waypoints
are typically created when a multiply defined database
waypoint used on a flight plan is no longer found in the
database. This may happen when a new database is
loaded. An obsolete waypoint can be accessed only
by verifying an existing waypoint on a flight plan. It will
be lost once its last occurrence on a flight plan is
p. Messages (MSG Key). System and sensor
messages are displayed on separate pages in the
message section. They are accessed by pressing the
MSG key. The message section will consist of as
many pages as are required to display current
messages. The MSG key is used to sequence
through the system and sensor message pages and to
return to the page that was displayed before accessing
the message section.
The NXT, BACK, and PRV keys are used to
page forward and backward through the message
pages. System messages describe the system's
operation with all related aircraft systems. Refer to
Figure 3A-55. Sensor messages describe the
operational status of each navigation sensor. Refer to
When new messages are added, the message
light will flash and a flashing asterisk will appear
adjacent to the new message.
Figure 3A-55. System Messages 1/1 Page
Figure 3A-56. Sensor Messages Page
q. System Operation.
(1) Power ON/OFF and Parallax Adjustment.
1. ON key Press (briefly). The self-test
approximately 30 seconds. During the
time that the SELF-TEST message is
displayed, the system is performing
internal self-tests. These tests verify
the inputs and outputs from the
Receiver Processor Unit (RPU).
If the system was turned off last by the
removal of aircraft power, the system will
turn on automatically when aircraft power
2. BRT key Adjust as required. The
system will initially come on full bright.