-Aileron deflection command: DELTA P AIL (label 310).
The ELAC limits these commands:
-
DELTA Q command: load factor limit between 0.4 g and 1.5 g. This limit is a function of VC, Mach, THS position and load factor.
-
DELTA P command : roll attitude limit equal to plus or minus 45 deg and rolling speed limit equal to plus or minus 10 deg/s (In landing configuration, this limit is equal to plus or minus 20 deg/s). These limits are a function of Vc.
FMGC command acknowledge logic is with respect to AP engagement wired discretes (2 discretes per AP: command and monitoring), status matrix monitoring of these labels, and concordance between AP engagement wired discretes and boolean information. In answer, each ELAC generates two ELAC AP DISC discretes (control and monitoring) to command AP disconnection when one of the following conditions is present:
-
loss of computation channel validity (comparators)
-
loss of power loop validity
. theta, phi, Vc, Mach and alpha values out of limits
. incidence protection active
. speed protection active
-controls used (side stick controller or pitch trim control wheel).
The AP can be engaged whatever the type of the EFCS control laws:
normal, alternate, direct.
In approach phase upon loss of both radio altimeters, the ELACs
inhibit AP engagement with the direct law and in landing gear
extended configuration.
The AP disconnects when it receives at least one disconnection
command (control and monitoring) from the 2 ELACs.
A disconnection command from one ELAC, only leads to a landing
capability reduction.
An ELAC priority logic exists for control surface control.
This logic is unchanged with AP engaged:
-
ELAC 2 has priority for elevator and THS control
-
ELAC 1 has priority for aileron control.
**ON A/C ALL
(4)
Spoiler Control (Ref. Fig. 011) Each ELAC receives a spoiler deflection command from the two FMGCs : DELTA P SPL (label 311). The command from the FMGC, selected according to the logic defined in the preceding paragraph, is limited in the ELACs so that roll attitude values are not greater than 60 deg and rolling speeds are not greater than plus or minus 10 deg/s (plus or minus 20 deg/s in approach). This limited command is sent to the three SECs. ELAC 1 has priority for spoiler control.
(5)
Nose Wheel Control (Ref. Fig. 012) Each ELAC receives a nose wheel steering command from the two FMGCs: DELTA NOSE WHEEL (label 313). The ELACs select one status of the two commands (from the FMGC1 and FMGC2) according to:
-AP engagement (discretes and boolean information on the bus)
-label 313 monitoring.
The selected command is sent to the BSCU.
The BSCU uses this command associated with commands from the control
wheel and rudder pedals to compute nose wheel control angle.
The command from the FMGC and the command from the rudder pedals are
limited with respect to speed.
The command from the FMGC is used after landing during taxiing when
the speed is less than 80 kts.
The BSCU generates four discretes (BSCU HEALTHY) whose validity is
taken into account:
-for capability computations
-in the ROLL OUT logic.
It also supplies 2 discretes (wheel speed) for the ROLL OUT logic.
Spoiler Control
Figure 011
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1
Nose Wheel Control
Figure 012
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B. Interface with Primary Flight Displays
(1) Presentation (Ref. Fig. 013) The FMGCs are linked to the PFDs to present the following information:
(a) Indications associated with AP/FD engagement
-AP engagement: white AP1, AP2 or AP1 + 2 message (2 APs engaged) on the 1st line
-FD engagement: white FD1 or FD2 message on the 2nd line, or white 1FD2 if energy management functions are actived.
NOTE : The indications associated with the A/THR engagement are
____ given in 22-32-00.
(b)
Indications associated with AP/FD modes When a new message appears in one of the five columns of the FMA, it is contained in a box for 10 seconds.
(c)
FD orders The FD orders are presented in two different ways. The selection is made between HDG V/S or TRK FPA on the FCU.
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