AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
MARCH 30, 2001
2-18-24
Page
1
Code
01
AIRCRAFT COMMUNICATIONS ADDRESSING
AND REPORTING SYSTEM (ACARS)
The airplane may be optionally equipped with an Aircraft
Communications Addressing And Reporting System (ACARS), a
UniLink UL-600. For additional information on functions and
operations, refer to the manufacturer’s manual.
The ACARS is an air to ground digital communication system that
exchanges data with ground based service providers. The ACARS
allows the flight crew to request and receive clearances, weather
reports and messages, eliminating the need to transmit routine
information through voice transmission. The system uses an assigned
airborne VHF frequency to transmit and receive data from a ground
station.
The ACARS is powered by 28 V DC from one of the Avionics Switched
DC buses. Should a power supply failure occur, the ACARS will be
inoperative, as there is no backup power supply to it.
The ACARS interfaces with other airplane systems and equipment as
follows:
− FMS - The pilot - ACARS interface is accomplished through the
FMS Control and Display Units (CDU).
− VHF - The VHF transmit and receive data with ground bases.
− Printer - provides a hard copy data printout.
− CMC - Sends maintenance information to the ACARS.
− Main Door - Automatically sends the inputs of door open/close
to the ACARS.
− Parking Brake - Automatically sends the inputs of parking brake
on/off to the ACARS.
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