庞巴迪CRJ200公务机机组操作手册 Bombardier CRJ-通讯(18)_飞行翻译_公务机_公务航空_Business Jet

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The ACARS consistsof aCommunications ManagementUnit(CMU)and anAircraft PersonalityModule (APM).
A. Communications Management Unit (CMU)
The CMUfunctions asthecentralprocessingand routing computer. TheCMUgathers aircraftdata from the various systemssuch as: aircrafttailnumber, flight number, departure station,etc. foruse in the downlink messagesandfor eventdetection. The systemallowstheaircraftto locateandacquire agroundstation for communications.
The CMUinterfaces withother avionics systems to provide ACARSfunction and
operation. These systems/componentsinclude:
W The FMSCDU,whichprovides the crew with ameans fordata entryintothe ACARS, abilityto receive anddisplay uplink messagesand avisualindication that thedata communication linkis operatingproperly.
W VHF3 configuredfordatalink. The CMUtunesVHF3totheACARSdata frequency(Canada:131.475Mhz)(UnitedStates:131.55Mhz)(Europe:131.725 Mhz). Whenthe aircraft moves from onenetwork coveragetoanother, theACARS willautomatically searchfor the appropriatefrequency. While searchingfor ausable frequency, aNOCOMMadvisoryis displayed ontheCDU. The advisorywillbe removed whentheACARSis communicating with aVHFground station.
W The CMU, which uses ARINCbuses forincoming data from theData concentrator units (DCU’s).
W The CMUalso uses theIntegratedAvionics Processor System ARINCbuses for incomingdata.
W The transponder, whichprovidesthe aircraftsuniqueICAOaddress (ModeS).
Transmittedinformation can include:
W Requestsfor air traffic control(ATC)data
W Flightplans andweatherdata
W Operationaland maintenance data Receivedinformation can include:
Flight Crew Operating Manual MASTER
CSP A-
013

COMMUNICATIONS Data Communication System Vol. 1 05-
40-
2
REV 56, Jan 31/03

W Text weatherdata
W ATC messagesand clearances
W Operationalmessages
B. Aircraft Personality Module (APM)
The aircraftpersonality module (APM)is amemoryunit which stores information unique tothe aircraft, such astail number, ICAOaddress, aircrafttypeand configuration.
C. ACARS Printer
The printeris installedin the copilot’s side console. Itis usedforpreflightandinflight activities to printpilot selection ofmessagesand weatherdata senttoitfromthe CMU. The printeris also usedby maintenance to downloadinformation.
D. ACARS Messages
(1) DownlinkMessages:
Downlink messages originate onboard the aircraft and are transmitted to the ground station automatically (appropriated system event detected) or by the crew. The CMU encodes the downlink message and stores it in a downlink queue until successfully transmitted.
(2) QueuedMessages:
Queued messages are transmitted in sequence or by priority. Once a message is transmitted, the CMU waits for the ground station to acknowledge (ACK) positive receipt of the message. If ACK is not received within a specific time frame, the message is transmitted again. Any downlink messages that are generated during a NOCOMM state (link to ground station is not established) will be stored in the queue buffer until the link to the ground station is established.
　
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