Honeywell Mark III manual LRU Interfaces, Flight Management Computer FMC, Performance Computer PZ

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2.2.3 LRU Interfaces

In general, the Mark III CMU can support any LRU that uses the ARINC 429 File Data Transfer Protocol or Williamsburg Protocol to communicate as an end system, as defined in ARINC 619 (ACARS file transfer protocols for other devices). ARINC 758 identifies a number of specific LRUs and the Mark III CMU supports interfaces to these LRUs:

Flight Management Computer (FMC)

The Mark III CMU can be configured to interface via low speed ARINC 429 with up to three ARINC 702 compliant FMCs operating as end systems. The Mark III CMU can alternatively be configured to interface with up to three ARINC 702A FMCs over high speed ARINC 429. The Mark III CMU can also accept ARINC 429 broadcast data from the FMCs. This broadcast data provides the CMU with data that is captured in the FIDB and available for use by the HGI and AMI.

Performance Computer (PZ)

In some aircraft installations, there is a separate performance computer (PZ) in addition to an FMC. The performance computer communicates with a CDU through the CMU (See Figure 5) via RS-422. The Mark III CMU can support a single interface to a performance computer with a software upgrade.

Performance Computer

NZ-2000

RS-422

 

 

RS-422

 

 

 

Mark III

 

 

 

CDU

 

 

 

 

 

 

 

CMU

 

 

 

 

 

 

 

 

 

 

 

Figure 5 CMU/PZ Pass Through Interface

Maintenance Computer

The maintenance computer name varies depending upon the Original Equipment Manufacturer (OEM) but is usually referred to as the Central Maintenance Computer (CMC), Centralized Fault Display System (CFDS), or Central Fault Display Interface Unit (CFDIU). The Mark III CMU can be configured to interface with one maintenance computer over low speed ARINC 429. This interface supports both end system communications as well as the maintenance computer protocol.

The maintenance computer protocol varies based upon airframe. The Boeing 747 uses broadcast fault bits while most other air transport aircraft (e.g., MD-10, MD-11, B-717, A-320, A-330, A-340) use an interactive data block transfer utilizing MCDU screens. Other aircraft types do not currently support maintenance computers (e.g., MD-80, MD-90, B-737, B-757, B767, regional and business jets). The baseline Mark III CMU supports the broadcast fault bits. Interactive data block transfer protocol will be available as a planned upgrade.

Aircraft Condition Monitoring System (ACMS)

The Mark III CMU can be configured to interface with a single Aircraft Condition Monitoring System (ACMS) or Digital Fault Data Acquisition Unit (DFDAU) via low speed ARINC 429. This interface supports end system communications using the standard ARINC 619 protocol in addition to providing the CMU access to

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Contents Honeywell Aerospace Electronic Systems Honeywell Aerospace Electronic Systems Introduction Mark III CMU OverviewDatalink Capability for Today and Tomorrow Honeywell Datalink Experience, Products, and Services Page Hardware Overview ArincSystem Interfaces Mark III CMU Interfaces DeviceArinc Interface Baseline Specificati Growth Subnetwork Interfaces Arinc VDR SDU Hfdr CMU Arinc 750 VHF Data Radio VDRFlight Deck Devices Interfaces UHFControl and Display Unit CDU Mcdu Midu CDULRU Interfaces Flight Management Computer FMCPerformance Computer PZ Aircraft Condition Monitoring System AcmsOther Interfaces Software Overview MIL-STD-1553BPcmcia OooiCMF VIACMU AOC HGI AMI Fidb Gbst Database DesignCertification Baseline Functionality AOA VDLM2Operations Uplink ProcessingDownlink Processing World RegionsSystem Pages DMT and DLTBite VDL Mode Growth FunctionalityAPM Data LoadingPcmcia Data Loading Arinc 761 SatcomMil-STD Weather GraphicsEncryption/Authentication ATNRRI Page Databases FidbGbst Fidb ArchitectureFidb HGI AMI Menus Main MenuMain Menu CDU Main Menu Supporting Regional / Business Jet CDUs ATS Menu System Menu Uplinks Clearance UplinkClearance Message Elements Clearance Message References Reject Reasons Reject Reasons Values Downlinks Diversion Report DownlinkDiversion Reasons Divert Message Elements Print Definition Logic UnitsPreferred Channel Management Oooi Logic UnitRegions US Map Areas Mechanical Design Interconnect CCAPower Supply CCA Processor CCAInput/Output CCA Spare CCAs Growth Detailed Interface DefinitionMcdu PrntrCMC ADLSDI PGM VHF PGM OooiVOICE/DATA MON SEL CMUMechanical Packaging Unit Weight Unit Connectors and MountsUnit Size Cooling RequirementsEnvironmental Specifications Power Input DO-160D Section Induced Signal Susceptibility DO-160D SectionWaterproofness DO-160D Section Fluids Susceptibility DO-160D SectionPower Requirements 1 115 Vac Input Power Requirements2 28 Vdc Input Power Requirements 3 28 Vdc Backup Input Power Requirements Power Interrupt RequirementsTechnical Summary
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