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TO/GA switches (3).
Input Details
The FMCFs get data from these interfaces:
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Flight control ARINC 629 buses
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Systems ARINC 629 buses
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AIMS inter-cabinet bus 2
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ARINC 429 buses
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Analog discretes.
PFC Inputs -Flight Control ARINC 629 Bus (L, R, & C)
The PFCs send bank angle protection data to the FMCFs. The FMCFs use this data to calculate the lateral guidance command.
ADIRU Inputs -Flight Control ARINC 629 Bus (L & R)
The ADIRU sends air data and inertial data to the FMCFs. The FMCFs use this data to calculate guidance and display commands.
SAARU Inputs -Flight Control ARINC 629 Bus (C)
The SAARU sends back-up air data and inertial data when the ADIRU fails.
AFDS Inputs -Systems Bus ARINC 629 (L, R, & C1)
The AFDCs send the ILS tune inhibit discrete and the arm/ operational mode discretes to the FMCFs. The FMCFs use the ILS discrete to inhibit all ILS tune requests when the AFDS is in the approach mode. The arm/operational mode discretes tell the FMCF when to send its LNAV/VNAV guidance commands to the AFDS.
WEU Inputs -Systems ARINC 629 Bus (L, R, & C1)
The WEUs send this data to the FMCFs:
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Maximum operating speed
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Minimum operating speed
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Maximum placard speed.
The FMCFs use this data to compare with its maximum and minimum speed calculations. The active FMCF sends the safe maximum and minimum speeds to the WEUs for aural annunciations.
ASCPC and CTC Inputs -Systems ARINC 629 Bus (L & R)
The ASCPCs and CTCs send bleed air data to the FMCFs. The FMCFs use this data to calculate thrust and display commands when VNAV engages.
EDIU Inputs -Systems ARINC 629 Bus (L, R, C1, & C2)
The data the EDIUs send to the FMCFs includes this:
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Low speed compressor RPM (N1)
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Fuel flow for each engine.
The FMCFs use this data to calculate thrust commands and thrust limits.
FSEU Inputs -Systems ARINC 629 Bus (L, R, & C1)
The FSEUs send flap position and flap lever position to the FMCFs. The FMCF uses this data in its maximum speed and minimum speed calculations.
PSEU Inputs -Systems Bus ARINC 629 (L & R)
The PSEUs send landing gear position to the FMCFs. The FMCFs use this data to calculate speed limits.
FQPU Inputs -Systems Bus ARINC 629 (L & R)
The FQPUs send total fuel to the FMCFs. The FMCFs use this data to calculate performance data.
OPAS Inputs -Systems ARINC 629 Bus (L & R)
The OPAS send this data to the FMCFs:
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FMC selector position (Left, right or AUTO)
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Navigation source switch position
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Display select panel (DSP) switch position.
Card Files Inputs -Systems ARINC 629 Bus (L & R)
The FMCFs receive air/ground discretes and airfoil and cowl ice protection system (ACIPS) bleed air data from the card files. The FMCFs use the air/ground data to start and stop radio position calculation. The FMCFs use ACIPS data to help calculate performance commands.
FMCF Inputs -AIMS Intercabinet ARINC 629 Bus 2
The active FMCF receives intercabinet data, such as flight plan and map data, from the other FMCF. It does a comparison check with the other data. The active FMCF starts a resync to the other FMCF when the comparison check does not agree.
GPS Inputs -ARINC 429 Bus
The GPS sends this data to the FMCFs:
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Altitude
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Latitude
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Longitude
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East/north/vertical velocities
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Horizontal figure of merit (HFOM).
The FMCFs use GPS altitude, position (LAT and LON), and velocity data with ADIRU and radio data to calculate present position and ground speed. The FMCFs use the HFOM to reject the GPS data when the data is not within the necessary limits.
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EFIS Control Panel Inputs -ARINC 429 Bus
The EFIS CPs send map data requests to the active FMCF to process. The active FMCF sends this map data to the PDF for display:
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Map mode
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Map range
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Navaid and waypoint data.
Analog Discrete Inputs -HF (2) and VHF (3) Communication Transceivers and TO/GA Switches (3)
When the flight crew pushes the microphone switch on the HF or VHF communication transceivers or pushes the TO/GA switches, an analog discrete signal goes to the FMCFs. The FMCFs use the analog discretes with other entry inputs from these components to monitor crew work:
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