Six air data modules (ADMs) supply pitot and static air data to the ADIRU and the SAARU. The ADMs transmit these data through the flight controls ARINC 629 buses.
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PFCS -FLIGHT CONTROLS ARINC 629 BUS INTERFACES
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PFCS -SYSTEMS ARINC 629 BUS INTERFACES
General
Many components of the PFCS transmit to and receive information from other airplane systems. Data on the systems ARINC 629 buses goes through the AIMS data conversion gateway function and then to the flight control ARINC 629 buses. The PFCS uses information from:
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The flap/slat electronics units (FSEUs)
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The proximity sensor electronics units (PSEUs)
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The left and right systems card files.
The PFCS transmits information to the left and right warning electronic units (WEUs).
The PFCS also uses radio altimeter data supplied through AIMS.
FSEU Interface
The FSEUs supply flaps and slats signals to the PFCs for the gain functions of the control laws. These signals show the retracted or not retracted condition of the flaps and the slats. The FSEUs also supply a signal to the ACEs.
PSEU Interface
The PSEUs supply truck tilt signals and associated fault messages to the PFCS. The truck tilt signals are used together with the weight on wheels and radio altimeter functions to operate the auto speedbrake.
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Systems Card Files Interface
The two systems card files supply signals from the hydraulic interface module (HYDIM) cards and the weight on wheels (WOW) cards to the PFCS.
The HYDIM cards supply hydraulic systems condition signals to the PFCS. They also supply data about the truck tilt pressure sensors.
The WOW cards supply air/ground signals to the PFCS. These signals supply air/ground information to the PFCS.
WEU Interface
The PFCS sends stabilizer and rudder trim position signals to the WEUs. The WEUs supply a takeoff warning if the stabilizer is out of green band or the rudder trim is out of normal limits.
The PFCs receive stall data from the WEUs for stall protection.
Engine Data Interface Units
The left and right engine data interface units (EDIUs) receive the N1 speed and calculate the thrust for each engine. The EDIUs supply these data to the AIMS and to the PFCS for the thrust asymmetry compensation (TAC) function.
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PFCS -SYSTEMS ARINC 629 BUS INTERFACES
Radio Altimeter Interface
The three radio altimeters supply information to AIMS for use by the PFCS for the flare function during manual landing. The PFCS inhibits the radio altimeter test when ground speed is more than 40 knots and during flight.
Indications
The status message PFCS INTERFACE shows because of one of these faults:
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There is a disagreement with the flap discrete signals in two or more ACEs
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Only two of the four FSEU channels are available
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Only two of the four digital WES channels are available
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Only one of the two truck tilt pressure data sources is available
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Thrust data from one of the left or right EDIU channels does not agree with the others
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Data from the two WOW cards does not agree.
These conditions cause the message to show in normal, secondary, and direct modes.
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PFCS -ANALOG INTERFACES
General
All analog interfaces with the PFCS go to the ACE. The primary inputs/outputs are:
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Rudder trim selector
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Manual trim cancel switch
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Pitch trim switches
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