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data and titles and the [SELECT/DESELECT ADC] option will be removed
from the display, and "LOCAL" will replace "XFILL" for reselection of
the associated ADC.
SAT - The static air temperature received from the air data
computer. Dashes are displayed if there is no input data.
ISA - As displayed on the ADC page, is the difference between SAT
and ISA (International Standard Atmosphere) for the current altitude.
DESEL ADC / SELECT ADC [4R] - This line select key is used to
alternately select or deselect the ADC sensor. If deselected, "(D)"
will be displayed following the sensor status.
The Air Data Computer (ADC) is automatically deselected during
ground operations and automatically selected at liftoff. The ADC
can, however, be manually deselected and reselected, and manual
inputs for True Airspeed (TAS) and altitude (ALT) can be made if
necessary.
Section VII
Sensors & Interfaces
7-4 2423sv602
Change 1
SHORT RANGE SENSORS
Distance Measuring Equipment (DME)
The DME-DME status and data is displayed on the DME Status
page. This page is accessed from DATA page 2.
An "(M)" following a station identifier indicates a manually selected
station. Manually selected DMEs are automatically deselected when
the range exceeds 300 NM. The letter “I” preceding the three-letter
designator indicates ILS-DMEs and LOC-DMEs. The distance
display is as follows:
• The distance is expressed to the nearest one-tenth nautical
mile.
• Dashes indicate no response from the DME station.
• A question mark (?) indicates the distance received from the
DME is questionable. The system will not use this input.
• Parentheses ( ) are used for manually selected DME stations
to indicate that the distance shown is a computed distance
from the aircraft to the DME station, not an actual DME
measurement. The parentheses disappear when a DME lockon
is established.
BACKUP/RRS - Only indicated when an RRS is installed. The RRS
or a backup DME (the aircraft’s primary DME) can be alternately
selected. When the backup DME is in use, it will continue to
automatically tune stations.
Section VII
Sensors & Interfaces
2423sv602 7-5
Change 1
DESELECT DME/SELECT DME - Pressing this Key will allow
manual selection/deselection of DME as desired. When deselected,
D will appear following DME Status.
During system initialization and ground operations, the DME will be
deselected. Upon takeoff, the DME will automatically be selected.
In the event of an aircraft weight-on-gear switch failure, the DME will
automatically be selected when the TAS reaches 150 kts.
Manual DME Station Selection
Normally, the DME-DME Status page will display four lines showing
four different DME stations and their respective distance readings.
As the computer automatically tunes all of the available DME
stations in the vicinity of the aircraft, the four stations displayed will
continually change.
This procedure provides the pilot with the option of directing the
computer to tune, and constantly display, one or two specific DME
stations.
1. Access the DME Status page by pressing the DATA function key
to access DATA page 2 and then selecting the [DME] option.
2. Press the [MAN DME] line select key to position the cursor over
the MAN DME entry field.
3. Enter the identifier of the desired DME using the LIST function.
The symbol (M) will be displayed after the identifier on the tuned
DME listing to indicate a manual selection.
NOTE: When initially selected, the FMS estimate of what the DME
distance should be will appear in parenthesis. When a
DME lock-on is established, the parenthesis will be
removed.
Section VII
Sensors & Interfaces
7-6 2423sv602
Change 1
Return To Automatic DME Station Selection
1. Access the DME Status page by pressing the DATA function key
to access DATA page 2 and then selecting the [DME] option.
2. Press the [MAN DME] line select key to position the cursor over
the MAN DME entry field.
3. Press the BACK and then ENTER keys to delete the manual
input.
NOTE: Manually selected stations will be automatically
deselected and automatic station selection resumed at
over a 300 NM range.
VOR
The VOR status and data are displayed on the VOR Status page.
The page is accessed from DATA page 2.
STATUS - This is the operational status of the VOR. The status
displayed will either be NORMAL or FAILED.
IDENT - The VOR station identifier. If RRS is installed the LIST key
can be used to manually select a station by ident.
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