SENSOR MESSAGES: (continued)
Sensor Message Explanation
DR Either the VLF (RPU), GPS or VPU sensor
is in the Dead Reckoning (DR) mode of nav-
igation. The message annunciator will not
illuminate for VPU.
ENTR SET HDG The IRS is in the attitude mode and a head-
ing value must be entered.
LINK FAIL Data exchange between the sensor and
CDU has failed.
*NAV RDY The sensor is capable of navigation, but has
not been placed in the navigation mode.
Message annunciator will not illuminate.
Only displayed when GPS sensor is not
available.
*NO NAV The sensor has not navigated since system
power up. Message annunciator will not illu-
minate.
NO RAIM RAIM is not available at this time.
NO RAIM @ DEST RAIM is available at the present time, but
will not be available at the destination arrival
time.
NO SYNC Omega synchronization has not been com-
pleted.
RCVR FAIL At least one Communication or Omega
receiver has failed.
STD FAIL The rubidium frequency standard in the RPU
has failed.
Page Display Definitions
2-79
GNS-XLS Flight Management System
Rev. 8
Apr/00
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