**ON A/C ALL
R Post SB 27-1113 For 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. If the pilot releases the P/BSW more than 30s after his takeover, he keeps his takeover. This takeover can be cancelled through action on the P/BSW of any side stick. Indications related to takeover: a red light comes on in front of the pilot who has lost priority, a green light comes on in front of the pilot who has priority as long as the stick which has not priority is not at zero. In case of simultaneous action on Captain and First Officer side sticks, the green CAPT and F/O legends located on SIDE STICK PRIORITY/CAPT and SIDE STICK PRIORITY F/O (130, 131VU) flash at the same time.
**ON A/C ALL
B. Elevator-Servocontrol Simultaneous-Pressurization Logic the four servocontrols can be simultaneously active (the two servo controls which are normally in damping mode become active in addition to the two normally active ones) in the cases below:
-elevator demand amplitude greater than a threshold function of Vc,
-
in flare law or landing direct law if the deflection demand is greater than 30./s
-
in case of undetermined mode detection (not in active, not in damping).
The three possible configurations are:
when the ELAC2 has priority
-
ELAC 2 commands the active mode to the other servocontrol which is controlled by the ELAC 1,
-
ELAC 2 commands the active mode to the other servocontrol which is controlled by the SEC 1, when the ELAC1 has priority
-
ELAC 1 commands the active mode to the other servocontrol which is controlled by the SEC 2, When the four servocontrols become active, the surface deflection rate can reach 50./s. When SEC 2 has priority
-SEC 2 commands the active mode to the other servocontrol which is controlled by the SEC 1.
C. Elevator Oscillation Detection The ELACs include a function to monitor specific oscillations of elevator surfaces in order to protect the aircraft structure. If this system is activated the elevator deflection is limited to few tenths of a degree around zero and both servocontrols are simultaneously pressurized (on one surface only) when speed is above 170 kts. Full authority is progressively restored from 170 kts to 150 kts. If the protection is activated it remains latched until next ELAC long autotest (ELAC low hydraulic reset).
D. Detection of a Manual Action on the Pitch-Trim Control Wheel If the pilot acts on the pitch-trim control wheel he forces the position commanded to the THS. (Electrical control is overriden by the mechanical control). The electrical control has again priority as soon as the pilot releases the control wheel.
NOTE : In direct law, in normal law, in alternate law and in autotrim the
____
THS is manually controlled.
E. THS Ground-Setting Logic 5s after landing the ELAC 1 set the THS in the 0. position. The priority logic for the ground setting function is as follows: E1 ------> E2 ------> S2 ------> S1.
F. Flight/Ground Logic computed in the ELACs (Ref. Fig. 014) The Ground information is validated:
-if both main landing gears are seen compressed (left LGCIU1 and left LGCIU2 and right LGCIU1 and right LGCIU2), or
1EFF : ALL 1 27-90-00Page 50 1 1 May 01/05R 1 1 1CES 1
Flight/Ground Logic ELAC
Figure 014
1EFF : ALL 1 27-90-00 Page 51
1 1 May 01/04
1 1
1CES 1
-
if at least two of above four information are seen compressed and radio
altimeter information (consolidated data) is lower than 50 ft, or
-
if the ground spoilers are extended from at least 2 SECs.
CONTROL INPUTS INTERFACE AND POWER SUPPLY - DESCRIPTION AND OPERATION
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