-
Monitoring of the difference between the potentiometer directly received by the associated unit.
(c) Order generation The side stick order in pitch used in the laws results from the addition of the orders in pitch of the CAPT and F/O side sticks. The side stick order in roll used in the laws results from the mixing of the orders in roll of the CAPT and F/O side sticks. This mixing is ruled by the priority logic between the two side sticks (CAPT and F/O) (Ref. 27-90).
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(4) Rudder pedal transducer unit
(a) Architecture R (Ref. Fig. 020)
(b)
Monitorings performed in the computer. These are identical with those performed for the side stick order transducers.
(c)
Validation logic for rudder position (CAPT and F/O). the rudder pedal position used for the computation of the control laws is issued from the transducer received by each unit (COM/MON).
R Rudder Pedal Transducer Unit - Architecture Figure 020
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(5) Hydraulic pressure transducers
(a) Architecture
R (Ref. Fig. 021) For each of the 3 hydraulic systems (Blue, Yellow, Green) there is the same architecture is the same. Each computer unit receives 3 pressure data from each system: - one from a pressure transmitter, - one from a pressure switch directly received by the unit, - one from a pressure switch received by the associated unit.
(b) Monitorings performed in the computer
-
monitoring of the variation range of each pressure transmitter,
-
monitoring of each hydraulic pressure switch (by comparison with the transmitter and the other pressure received by the ELAC)
-for each hydraulic pressure system : if at least 2 of the 3 pressure data (within one ELAC) detect high pressure (or low pressure) the hydraulic pressure state generated by the ELAC is a high pressure state (or low pressure state).
R Hydraulic Pressure Transducers - Architecture Figure 021
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(6) SFCC
R (Ref. Fig. 022)
(a)
Architecture Each ELAC unit is connected to the SFFC by ARINC 429 buses and hard wired discretes.
(b)
Monitoring Each unit receives 3 types of information:
-
One directly from the SFFC
-
One from the other unit
-
One from the associated unit of the other ELAC.
Each SFCC bus validity is produced by the following monitorings:
-SSM
-Refresh/Parity
-Comparison between bus information and discrete input
Boolean information of each source are compared. If at least two
types of validated information are in agreement, this data is
used for computation.
(7) Radio altimeter (RA)
(a)
Architecture The same radio-altimeter ARINC 429 output is connected to the two ELACs. The COM units of each ELAC receive RA1, the MON units receive RA2, the values directly received are exchanged by the COM/MON buses.
(b)
Monitoring Validity of each bus is produced (on label 164) by the monitorings below:
-SSM
-Refresh/Parity
-Coherence monitoring: a RA is definitively eliminated for law computation if, while Vc is higher than 200 Kts, it gives HRA value lower than 50 ft.
(c) Data validation If both RAs are valid (by bus monitoring):
-Information from the different sources are compared. If a disagree appears,the altitude is set at a value higher than 200 ft (except if the full slat/flap configuration is seen for 10 s minimum).
If only one RA is valid:
-The altitude is set at a value higher than 200 ft is the speed
is higher than 180 kts.
If no RA is valid:
R SFCC Figure 022
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-The altitude is set at a value higher than 200 ft.
(8) Servocontrol position transducers
R (Ref. Fig. 023) The two monitorings below are performed for each servocontrol position transducer:
-
Monitoring of the variation range of the value that the transducer supplies.
-
Monitoring of the reference voltage that the transducer supplies.
(9) Solenoid valve position transducer
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