(2) Behaviour of the FAC under 26V/400 Hz cutoffs (Ref. Fig. 004) The 26V/400 Hz is only used to energize the position feedback transducers. Loss of the transducer 26V is detected by monitoring the VR value through comparison with a VRTH value (theoretical VR). This second detection also enables to monitor the 26V cutoff:
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Behaviour of the FAC under 26VAC/400 Hz Cutoff (on 1 channel)
Figure 004
1EFF : ALL 1 22-67-00Page 7 1 1 Feb 01/98 1 1 1CES 1 The 26V cutoff is effective when the three VR voltages (yaw damper, rudder trim and RTL) are simultaneously lower than 75% of their theoretical values. If only one or two VR voltages are lower than this threshold, the 26V cutoff is not considered.
-First case : 26V cutoff lower than 200 ms. The three actuators remain engaged but the three slaving orders are inhibited by this software monitoring (INHIBITION ORDER). This signal cancels the three current outputs of the FAC during the cutoff. The transducer monitoring is inhibited one second after the beginning of the cutoff to avoid untimely disconnections at 26V restoration.
-Second case : 26V cutoff greater than 200 ms. The three actuators are disengaged and there is a changeover on the three channels.
2. Hydraulic Power Supply______________________ (Ref. Fig. 005)
A. The electro-hydraulic yaw damper servo-actuator uses the aircraft hydraulic power supply. The servo-actuator comprises two independent motors which can drive the output shaft and therefore the rudder. The servo-actuator 1 associated with the FAC1 is powered by the Green hydraulic system. The servo-actuator 2 associated with the FAC2 is powered by the Yellow hydraulic system. As no internal pressurization contact is provided in the servo-actuator, any possible absence of pressure is detected at the level of the consequences (non slaving). A signal external to the servo-actuator is available.
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Yaw Damper Servo-Actuator - Hydraulic Power Supply
Figure 005
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DISCRETES/ANALOG INTERFACES (FAC) - DESCRIPTION AND OPERATION
_____________________________________________________________
1. General
_______
The FAC utilizes:
-Hard-wired discretes
-Analog signals
(Ref. Fig. 001)
2. Discrete Signals
________________
A. Inputs
NOTE : The pin program inputs are not listed.
____
-------------------------------------------------------------------------------| NAME | ELECTRICAL LEVEL | FROM | SIGNAL STATUS | |----------------------|------------------|---------------|-------------------| | AP OWN ENGD COM | GND/O.C. | FMGC OWN C | GND = ENGAGED | | AP OWN ENGD MON | GND/O.C. | FMGC OWN M | GND = ENGAGED | | AP OPP ENGD COM | GND/O.C. | FMGC OPP C | GND = ENGAGED | | AP OPP ENGD MON | GND/O.C. | FMGC OPP M | GND = ENGAGED | |----------------------|------------------|---------------|-------------------| | YAW OWN ENGD COM | GND/O.C. | FAC OWN C | GND = ENGAGED | | YAW OWN ENGD MON | GND/O.C. | FAC OWN M | GND = ENGAGED | | YAW OPP ENGD COM | GND/O.C. | FAC OPP C | GND = ENGAGED | | YAW OPP ENGD MON | GND/O.C. | FAC OPP M | GND = ENGAGED | |----------------------|------------------|---------------|-------------------| | RUD TR OWN ENGD COM | GND/O.C. | FAC OWN C | GND = ENGAGED | | RUD TR OWN ENGD MON | GND/O.C. | FAC OWN M | GND = ENGAGED | | RUD TR OPP ENGD COM | GND/O.C. | FAC OPP C | GND = ENGAGED | | RUD TR OPP ENGD MON | GND/O.C. | FAC OPP M | GND = ENGAGED | |----------------------|------------------|---------------|-------------------| | RTL OWN ENGD COM | GND/O.C. | FAC OWN C | GND = ENGAGED | | RTL OWN ENGD MON | GND/O.C. | FAC OWN M | GND = ENGAGED | | RTL OPP ENGD COM | GND/O.C. | FAC OPP C | GND = ENGAGED | | RTL OPP ENGD MON | GND/O.C. | FAC OPP M | GND = ENGAGED | |----------------------|------------------|---------------|-------------------| | ELAC OWN HLTY MON | GND/O.C. | ELAC OWN M | GND = HEALTHY | | ELAC OPP HLTY COM | GND/O.C. | ELAC OPP C | GND = HEALTHY | |----------------------|------------------|---------------|-------------------| | ENG OWN STP | GND/O.C. | PRESS SW OWN | GND = STOPPED | | ENG OPP STP | GND/O.C. | PRESS SW OPP | GND = STOPPED | |----------------------|------------------|---------------|-------------------| | RUD TR R NC COM | GND/O.C. | ) RUDDER | OC = RIGHT | | RUD TR R NO MON | GND/O.C. | ) TRIM | GND = RIGHT | | RUD TR L NC COM | GND/O.C. | ) COMMAND | OC = LEFT | | RUD TR L NO MON | GND/O.C. | ) SWITCH | GND = LEFT |
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FAC - Discretes/Analog Interfaces
Figure 001
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