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transmitted immediately after the event occurs (when in data mode.)
Manual Functions
The CU provides the means for manual operation of the ACARS and also
provides for a visual observation of the system mode of operation and status.
Functions performed using the CU are as follows:
· Call-up and display of GMT.
· Select and enter various data messages into the MU.
· Call-up and display “out / off / on / in” event times during flight.
· Manually select system mode of operation.
· Monitor system status.
COMMUNICATIONS
737 Sec. 6.5 Page 39
Flight Manual Continental Rev. 11/15/02 #41
ACARS Control Unit
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COMMUNICATIONS
Sec. 6.5 Page 40 737
Rev. 11/15/02 #41 Continental Flight Manual
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COMMUNICATIONS
737 Sec. 6.5 Page 41
Flight Manual Continental Rev. 11/15/02 #41
ALPHANUMERIC DISPLAY
· Display data selected from the keyboard.
· This display is often referred to as the “scratch pad” since it is used to
check inputs before entering and sending.
STATION DISPLAY
· Displays the departure or destination station as selected by the appropriate
switches.
· Destination station automatically changes to the departure station eight
minutes after the IN event occurs.
STATION (SLEW) SWITCHES
· Used to set in the departure or destination station in the Station Display.
· UP/DOWN (momentarily - less than .5 second) - Characters in the Station
Display rotate once per actuation.
· UP/DOWN (hold) - Characters rotate at a rate of 5 characters per second.
INITIALIZATION SWITCH
· Activates the data entry sub-routine and automatically sequences the
standard data required.
· Allows for entry of departure information such as flight number, station of
destination and fuel on board.
T/O ENG SWITCH
· Allows computerized systems to analyze engine performance information.
· Provides a means to supply reduced take-off thrust and engine data to a
ground station through the data link system.
LINK TEST SWITCH
· PRESS (momentarily) - Initiates a system self test which generates an
aircraft to ground station test message and a ground station to aircraft test
message which includes a GMT clock update if aircraft is at the gate, i.e.,
between IN and OUT times.
· All Alphanumeric and station display lights, Function Selector Keyboard
and annunciator lights illuminate.
· A SELCAL chime sounds and the SELCAL #2 light illuminates.
COMMUNICATIONS
Sec. 6.5 Page 42 737
Rev. 11/15/02 #41 Continental Flight Manual
WEATHER STATION SWITCH
· Allows the current sequenced weather at the destination station (or the
station of choice) to be received and printed on the flight deck printer
(when installed).
SEND SWITCH (Green)
· Used to send crew-initiated messages.
· ILLUMINATED - Indicates transmission of automatically sent messages or
that data mode is selected (to advise the ground station that the aircraft is
signing in). Illuminates for at least 2 seconds.
· EXTINGUISHED - Indicates acknowledgment from the ground station.
ENTER SWITCH
· Transfers data into the MU that was manually entered via the Keyboard.
CLEAR SWITCH
· Clears the displayed data if not yet entered, and clears the system if an error
was made during entry.
OUT - OFF - ON - IN SWITCHES
· PRESS (hold) - Displays the GMT when the selected event last occurred.
· RELEASE - Display returns to blank or previous status.
GMT SWITCH
· PRESS - Present GMT is displayed.
· RELEASE - Clears the GMT display.
NUMERIC SWITCHES (KEYBOARD)
Used to insert numeric data for:
· Flight Number
· Fuel
· ETA
· Engine Data
· Other functions related to the GND ADRS and MISC switches.
COMMUNICATIONS
737 Sec. 6.5 Page 43
Flight Manual Continental Rev. 11/15/02 #41
DATA MODE SWITCH (Blue)
· PRESS - Switch illuminates to verify selection of data mode.
· ACARS transmits data automatically over VHF No. 3 on the discrete
frequency of 131.55 MHz.
VOICE MODE SWITCH (Blue)
· Used to transfer from data mode to voice mode. If while in data mode a
SELCAL two-tone alert chime is received, the VOX MODE light flashes for 5
seconds, then illuminates steady. This alerts the crew that the system has
automatically switched to voice mode communication with the ground.
Approximately 2 minutes after voice mode is activated, the DATA MODE light
　
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