737 MAX Flight Crew Operations Manual
Communications -
System Description
MN-FLT-OH-201
5.20.9
The airborne system consists of a management unit in the E/E compartment, either
an interactive display unit or multipurpose control display unit (MCDU), and
frequently a printer. Data is entered and transmitted to the ground operations
center.
ACARS Message
1
•ACARS Uplink Message (white)
Indicates receipt of an uplinked ACARS message. The uplink is identified by a
CDU scratchpad message.
Satellite Communications (SATCOM) System
1B401, 1B402, 1B801 - 1B824
The SATCOM system provides both data and voice communications. The satellite
data unit is controlled through the control display units (CDUs). Voice
transmission is controlled using CDUs and the audio control panels.
Calls can be initiated using the CDU. Directories of airline defined numbers are
line selectable or manual numbers can be entered. The SATCOM CDU control
pages are displayed by selecting SAT on the MENU page.
SATCOM menu configuration is defined by the airline and is not presented here.
ACARS
ENGINE DISPLAY
1
March 1, 2021