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5. At the BARO ALT field enter the current BARO altitude.
6. TAS and Altitude inputs must be updated as required.
If a second FMS is installed air data may be crossfilled from the
other system.
NOTE: Without valid air data inputs to the FMS, VNAV is not
available and any leg type terminators requiring altitudes will not be
sequenced.
AFIS ARINC FAILURE - The FMS has determined that a failure is
present on the AFIS ARINC bus.
AFIS CONFIG INVALID - The AFIS DMU has invalid configuration
data. This will disable the air/ground data link. This message will
remain on the MSG page until the condition clears.
AFIS DOWNLINK FAIL - The AFIS DMU has determined that a
downlink communication has failed. The last request should be
repeated.
AFIS NO COMM - The AFIS DMU has failed to establish contact
with the ground station. The last request should be repeated. This
message will remain on the MSG page until the condition clears.
AFIS UPLINK FAIL - The AFIS DMU has determined that an uplink
communication has failed. The last requested information will
probably not be received.
AFIS VHF LINK DISABLED - The AFIS DMU has determined that
the VHF link is disabled. This may result when (in a shared antenna
system) the VHF antenna being used by the aircraft voice
communication system. It may also occur when all in-range VHF
ground networks have been disabled.
Messages
4 2423sv602
Change 1
AFIS VHF MODEM FAILURE - The AFIS DMU has determined that
the VHF Modem unit within the AFIS is not operational. This
message will remain on the MSG page until the condition clears.
AHRS # FAIL - The AHRS input has failed or its status word
indicates failure.
AHRS # HEADING FAIL - The AHRS heading has failed while in
use as the FMS heading source. This message is suppressed while
the aircraft is on the ground.
1. Press the DATA key to access Data 4/4.
2. Place cursor over the HDG field.
3. Press the LIST key to access a display of alternate heading
sources.
4. Select an alternate heading source.
AIRPORT DATABASE FAIL - A problem has been found in the
airport section of the navigation data base. Verify airport
coordinates of interest. There is a high probability that the system
will fail the initial self-tests the next time it is turned on. After landing
and shutdown, turn the system off and then on again in order to
troubleshoot.
1. Reload the navigation database.
AIRWAY DATABASE FAIL - A problem has been detected in the
Airways database.
1. Reload the navigation database.
ALERTER ABOVE VNAV ALT – In the Primus 1000 installation,
VNAV is engaged and the altitude alerter has been dialed above the
VNAV altitude.
ALIGN PT DATABASE FAIL - A problem has been detected in the
Align Points database.
1. Reload pilot database disk.
ALT INVALID FOR VNAV - A VNAV problem is defined, but (1) only
pressure altitude is available and the aircraft is below 18,000 feet, or
(2) altitude has failed.
Messages
2423sv602 5
Change 1
ALTITUDE INVALID - The altitude portion of the Air Data Computer
is not usable. A manual entry of altitude may be made on the ADC
Status page.
1. Press the DATA key until DATA 2/4 is accessed.
2. Press the line select key at ADC to access ADC 1/1.
3. At the BARO ALT field, enter the current BARO altitude.
ANALOG ATTITUDE FAIL - Displayed if analog inputs are being
used for Doppler NAV and those inputs go invalid for more than 5
seconds. Message remains while inputs are invalid.
ANALOG BOARD FAIL - A failure is detected on the Analog Board.
The outputs to the HSI may be affected, and depending upon
installation, heading and fuel flow in some systems may also be
affected. Verify on the DATA pages that the heading, TAS, and
altitude inputs are reasonable.
1. Press the DATA key to access DATA 2/4
2. Press ADC prompt to access ADC page and verify TAS and
altitude.
3. Press DATA key to access DATA 4/4.
4. Verify HDG.
5. If HSI is analog type, do not use for navigation display.
ANALOG INST FAIL - The Analog Waypoint Bearing or Desired
Track self test has failed or the instrument reference is missing.
1. Check 26 VAC circuit breakers for FMC instrument reference
input.
APPR ARM AVAIL <NAV> - Less than 3.0 nm from first approach
waypoint (either FACF or FAF) and approach has not yet been
armed or less than 30 nm from EOA waypoint.
1. Arm approach by pressing the ARM APPR on NAV 1/3.
APPR FACILITY INVALID - Presented with no message
annunciator if the approach facility becomes invalid during an
approach.
APPROACH DATABASE FAIL - A problem has been detected in
　
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