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Gamma n Calculation
Figure 049
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V GROUND Calculation
Figure 050
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Generation of the Reference Speed - Flight/Ground Logic
Figure 051
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Programmed Input Control speed
Figure 052
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The regulator cannot, therefore, anticipate on the braking orders
of the pilot. Below a 10 m/s reference speed, the regulator
action is inhibited by forcing the control speed value at 0 m/s
(enabling wheel locking).
The regulator supplies numerical values converted into current to
supply the coil:
- of the Normal servovalve I1 or I2,
- of the Direct Drive Valve I'1 or I'2.
The current control is not affected by the impedance of the
servovalve coil.
When sufficient brake release current is available, the voltage
at the terminals of resistor R is sent to the lower ECAM DU.
It supplies the brake-release indication, REL (Release)
symbolized by 5 green bars on the wheel concerned.
The regulation circuit of the Normal or Alternate servovalve
supplies the REL information.
A regulation-inhibition circuit eliminates all the
brake-release orders that could occur:
-during an automatic in-flight wheel braking when the gear
retracts, - or during application of the Parking brake (for 3 s only).
1EFF : 401-499, 1 32-42-00Page 91 1 1 Config-2 Aug 01/05 1 1 1CES 1 D. Braking During L/G Retraction
Braking occurs automatically during the retraction of the landing gear. This stops the rotation of the MLG wheels before the landing gears go into their related bays. This prevents damage to the aircraft components and structure if a tire has been damaged. When the landing gear selector lever is put in the UP position:
-
the brakes selector valve is energized to connect the Green hydraulic power supply to the normal braking system.
-
the servovalves are energized with a set control current to get the necessary brake pressure.
After three seconds or when the NLG moves away from the downlocked position the selector valve and the servo valves are de-energized. This connects the system to return to release the pressure at the brakes.
E. Indicating
(Ref. Fig. 053)
The A/SKID & NOSE WHEEL control switch is located on the center
instrument panel.
All the indications are transmitted to the crew through the ECAM:
-
On the lower display unit, the WHEEL page gives the Release information, the NORMAL/ALT braking mode and the selected deceleration,
-
On the upper display unit the related warnings are displayed.
-------------------------------------------------------------------------------| FAILURE WARNING | CLASS | LEVEL | ASSOCIATED WARNING | -------------------------------------------------------------------------------| BRAKES HOT | 1 | 2 | MASTER CAUTION,SINGLE CHIME | |-----------------------------------------------------------------------------| | BRAKES AUTO BRK FAULT | 1 | 2 | MASTER CAUTION,SINGLE CHIME | | BRAKE RELEASED | | | | |-----------------------------------------------------------------------------| | WHEEL N/W STRG FAULT | 1 | 2 | MASTER CAUTION,SINGLE CHIME | |-----------------------------------------------------------------------------| | CONF PARK BRK ON | 1 | 3 | MASTER WARNING, CRC | |-----------------------------------------------------------------------------| | BRAKES A/SKID N/WS OFF | 1 | 2 | MASTER CAUTION,SINGLE CHIME | |-----------------------------------------------------------------------------| | BRAKES A/SKID N/WS FAULT | 1 | 2 | MASTER CAUTION,SINGLE CHIME | |-----------------------------------------------------------------------------| | WHEEL HYD SEL FAULT | 1 | 2 | MASTER CAUTION,SINGLE CHIME | |-----------------------------------------------------------------------------| | BRAKES SYS 1(2) FAULT | 1 | 1 | |
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Indicating
Figure 053
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