-
decrease the number of pilot actions at take-off (one action on throttle instead of two actions: braking + throttle)
-improve passenger comfort.
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Indicating
Figure 065
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Auto Brake Control R Figure 066
1EFF : 001-049, 051-099, 101-105, 151-199, 1 32-42-00Page A32 1201-220, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1 Before landing, the pilot sets the deceleration rate he thinks to be adapted to the runway. For this purpose, he uses the AUTO BRK LO/MED and MAX on the center instrument panel. The pilot can disengage the autobrake when he depresses the pedals or when he pushes again the AUTO BRK LO/MED and MAX. Before takeoff, the pilot can select the MAX mode.
(b) Indicating
Each lighted pushbutton switch is divided into two parts:
-
the lower part (ON legend) comes on blue to show that the pushbutton switch has been selected and the system armed,
-
the upper part (DECEL legend) comes on green: when the corresponding deceleration rate has been reached, (LO and MED pushbutton switches) or when you have a deceleration rate higher than 0.27 g (MAX pushbutton switch).
(2)
Auto brake logic The auto brake logic is located in the BSCU on the control and monitoring boards of the SYS 1 and SYS 2. The signals below are sent to the logic circuits of the auto brake:
-
3 signals that the AUTO BRK LO/MED and MAX on the center instrument panel supply: 2 deceleration rates (LOW = 1.7 m/square second and MED = 3 m/square second) and a MAX = 6 m/square second (higher than the maximum possible deceleration of the aircraft)
-
3 signals which tell that the ground spoilers are extended. Two of them must be present to permit the automatic braking.
-
a signal which gives the pedal position,
-
a signal which tells that the pressure in the Green system is low,
-
a signal which gives the longitudinal deceleration of the aircraft ADIRs.
-no tachometer failure.
-GROUND/FLIGHT information.
The auto brake logic supplies:
-
the command for the energization of the selector valve,
-
the braking command to the four servovalves,
-
the information below to the lighted pushbutton switches:
the system is armed or the deceleration rate that you get
-to the ECAM system: the deceleration rate that you select or the AUTOBRK disarm signal or the AUTO BRK FAULT signal if arming is not possible.
(3)
Operation
(a) MED and LOW modes
1 These modes are used at landing.
_
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2_ The selector valve is energized by the extension command of
the ground spoilers.
3_ It is possible to apply the brakes if the ground-spoilers
extension signals are present (speed of the main gear wheel >
80 kts).
The braking has a delay of 4 seconds for the LOW mode and 2
seconds for the MED mode. It is then progressively applied.
4_ The pressure supplied by the 4 servovalves gradually
increases, t = 3 s approx.
The programmed reference speed is reached progressively.
5_ The control circuit sends identical commands to the 4
servovalves.
6_ The integrator recopies the reference speed, it limits its
decrease according to the deceleration that the crew selects.
(b) MAX mode
1 This mode can be selected for acceleration-stop.
_
2 The command for the ground spoiler extension controls:
_
-
the energization of the selector valve,
-
the immediate delivery of a maximum pressure to the four brakes.
3 The programmed deceleration rate is such as the full pressure
_ is applied on the four brakes. The automatic braking stops gradually. The AUTO BRK indication on the lower ECAM DU flashes during 10
s. The selected pushbutton switch goes off.
If the braking input from the pedals is lower than that from
the auto brake system, the transition is gradual (pressure
gradient 50 bars/s approx. (725 psi/s).
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