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starts flashing as an alert to switch back to data mode. If it is desired to
remain in the voice mode, press the VOX MODE switch to extinguish the DATA
MODE light. If data mode is desired, press the DATA MODE switch. The DATA
MODE light changes from flashing to steady, indicating that the system has
switched back to the data mode, and the VOX MODE light will extinguish.
Voice mode may also be manually selected in conjunction with the MISC
switch. Either the VOX MODE or DATA MODE light is illuminated at all times.
FUNCTION SELECTOR POS, ETA, FUEL
· Used with the keyboard to enter appropriate data into the MU for
transmission.
MISCELLANEOUS SWITCH
· Used with the keyboard to select coded messages or to select a voice mode
frequency.
GROUND ADRS SWITCH
· Used with the keyboard to enter a telephone number or code which is
transmitted to the ground station for a direct phone patch to the aircraft.
· BRIGHTNESS CONTROL (Dual control).
· ROTATE - Sets brightness of background lighting and display intensity.
NO COMM LIGHT (Amber)
· ILLUMINATED - A message has been transmitted either automatically or
manually, and receipt was not acknowledged by the ground station.
COMMUNICATIONS
Sec. 6.5 Page 44 737
Rev. 11/15/02 #41 Continental Flight Manual
CU FAIL LIGHT (Amber)
· ILLUMINATED - The system has detected a failure in the control unit.
MU FAIL LIGHT (Amber)
· ILLUMINATED - The system has detected a failure in the management
unit.
VOICE BUSY LIGHT (White)
· ILLUMINATED - A GND ADRS has been initiated by the crew and the
ground station is in use (busy).
COMMUNICATIONS
737 Sec. 6.5 Page 45
Flight Manual Continental Rev. 11/15/02 #41
ARINC COMMUNICATIONS ADDRESSING AND REPORTING
SYSTEM
>@ ACARS System
The ARINC Communications Addressing and Reporting System (ACARS) is
an addressable, digital, data link system which permits exchange of data and
messages between the aircraft and a ground-based operations center utilizing
the on-board VHF-3 communication system.
The ACARS airborne subsystem provides for the manual entry of routine data
such as departure / arrival information. Also possible is the manual entry of
addresses (telephone codes) of parties on the ground for voice communication.
The airborne system consists of a Management Unit (MU) in the E & E
compartment and an Interactive Display Unit (IDU.) Data is entered and
automatically transmitted to the ground operations center. The system also
provides monitoring of the aircraft Out / Off / On / In (OOOI) sensors. These
OOOI times are automatically transmitted to the ground station at times
specified by the built-in program.
COMMUNICATIONS
CONTROL
LAND LINE CONNECTING VOICE
ARINC CONTROL AND
COMMUNICATIONS CONTROL
DATA
131.55MHz
ARINC DATA
LINK CONTROL
ARINC DATA
LINK STATION
VOICE
STATION
37371690
ACARS SYSTEM
COMMUNICATIONS
Sec. 6.5 Page 46 737
Rev. 11/15/02 #41 Continental Flight Manual
When the IDU is initially powered up (AC busses powered) it establishes
contact with the ACARS and the Digital Flight Data Acquisition Unit
(DFDAU). The IDU screen then displays the MAIN MENU. This is the root
page for accessing all other ACARS pages. Return to this MAIN MENU is
possible by touching the MENU cue on any displayed page.
When a cue is touched on the IDU screen, the cue name is highlighted in
reverse video. Moving the finger to another cue without breaking screen
contact returns the cue first touched to normal video and highlights the new cue
being touched. Releasing the highlighted cue activates the cue’s function.
The following cues are special in that they always perform the same functions:
MENU, RTN, ENT, CLR, SEND RE-DO and VOX. Other cues are advisory
cues. Advisory cues appear in place of **** on the standard ACARS menu.
Some advisory cues flash from normal to reverse video: FAIL, DATA, SELC,
*MSG*, and INIT. Other advisories are displayed in normal video: SEND,
NOCOM, VOICE; and in reverse video: FAIL.
COMMUNICATIONS
737 Sec. 6.5 Page 47
Flight Manual Continental Rev. 11/15/02 #41
ACARS Operation
Introduction
ACARS (Aircraft Communications Addressing and Reporting System) is a
digital air-to-ground data communications link between the aircraft and the
Continental host computer.
The IDU (Interactive Display Unit) is located on the pedestal and used by the
pilot for input to the ACARS or DFDMU. It uses an infrared LED matrix to
detect touches on the screen. There are no hard keys on the IDU, rather menus
　
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