-looped,
-permanently monitored.
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B. Conditions Related to the Computer Status The EFCS computers can operate normally when:
-
the engagement pushbutton switch is pressed,
-
the self-test results are satisfactory.
C. Conditions Related to Servoloops All the failures detected by the servoloop monitorings are self-held until the next computer reset through action on the pushbutton switch or power supply rise.
(1)
Pitch servoloop An ELAC can be engaged in pitch if its 3 pitch servoloops are valid. An SEC can be engaged in pitch if one of the surface servoloops is valid. An elevator servoloop is declared valid by a computer if the result of the monitorings below is satisfactory:
-
monitoring of the servovalve current,
-
monitoring of the servovalve selector valve,
-
monitoring of the position of the servovalve spool valve,
-
monitoring of the servocontrol position transducers,
-
monitoring of the mode selector valve,
-
monitoring of the mode selector valve position,
-automatic tests launched at the third hydraulic rise. A THS servoloop is declared valid by a computer if the result of the monitorings below is satisfactory:
-
monitoring of the servomotor current,
-
monitoring of the THS position,
-
monitoring of the THS position transducers.
-automatic test results: monitoring of the relay ensuring cutoff of the electric motor,
(2)
Aileron servoloops An ELAC can be engaged in lateral if at least one of the two aileron servoloops is valid. If the ELAC 1 can only drive one aileron, the ELAC 2 drives the other aileron from the order computed by the ELAC 1. An aileron servoloop is declared valid when the result of the monitorings below is satisfactory:
-
monitoring of the servovalve current,
-
monitoring of the servovalve failures,
-
monitoring of the servocontrol position transducer,
-
monitoring of the discrete links between ELAC 1 and ELAC 2 (performed in the ELAC 1 only).
-result of automatic (launched or third hydraulic rise) test: monitoring of the mode selector valve transducer , monitoring of the servocontrol modes.
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(3) Spoiler servoloops A SEC can be engaged on a pair of spoilers when the two servoloops are validated. The servoloops of a pair of spoilers are validated when:
-the result of the monitorings below is satisfactory: monitoring of position transducers, monitoring of servovalve currents, monitoring of positions.
D. Conditions Related to Hydraulic Systems The ELAC 2 can drive in pitch if the Green and Yellow hydraulic systems are available or upon a dual hydraulic failure, including the Blue system. The ELAC 1 can drive in pitch if the Blue hydraulic supply is available. In lateral, a servoloop can only be validated if the related hydraulic power source is available.
E. Conditions Related to Sensor Status
-
In pitch
The ELAC 2 loses priority upon failure:
- of one of the eight side-stick transducer units related to it,
- of the two accelerometers related to it (in normal electrical
condition) - of one pedal-position transducer unit, - of 2 radio-altimeters (only detected by the ELAC 2). The ELAC 1 loses priority in pitch upon failure of one of the 8 side stick transducer units which are related to it:
-
In lateral
The ELAC 1 loses priority upon failure:
- of one of the 8 side stick transducer units,
- of one pedal-position transducer unit.
The ELAC 2 has no longer priority upon failure of one of the eight
side-stick transducer units.
8. Miscellaneous Logics
____________________
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
A. "Priority between Side-Sticks" logic The CAPT and F/O stick orders are algebraically added. The takeover and priority pushbutton switch on the side stick is used to take over and to disconnect the auto pilot. The takeover and priority logic is described below:
-the last pilot who presses the pushbutton switch takes over and cancels the order from the other pilot.
If the pilot releases the P/BSW within the 30s which follow the
takeover, his priority is cancelled.
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