R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
2. System Description
__________________
A. Anti Skid System The anti skid system gives the maximum braking efficiency as it keeps the wheels at the limit of skidding. The brake release orders generated are sent to the four Normal or four Alternate brake servovalves and to the ECAM system. This system gives a display of the released brakes and of the actions and limitations associated with the various possible failures. The A/SKID & NOSE WHEEL switch on the center instrument panel is used to disconnect the anti skid system and the nose wheel steering.
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Nose Wheel Braking
Figure 001
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B. Braking Modes
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 301-399,
(Ref. Fig. 002)
**ON A/C 106-149, 221-299,
(Ref. Fig. 002A)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
The four braking modes available depend on:
-
the hydraulic system used,
-
the position of the A/SKID & NOSE WHEEL switch and PARK BRK control switch.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 301-399,
(1) Normal Braking
You get normal braking when:
-
the Green hydraulic high pressure is available,
-
the A/SKID & NOSE WHEEL switch is in the ON position,
-
the PARK BRK control switch is in the OFF position. You get the control which is electrical:
-through the pedals,
-automatically: on the ground by the autobrake system or in flight when the landing gear control-lever is placed in the UP position during 3 seconds.
No indicator of Normal brake pressure is used.
The regulation is performed on the four Normal brake servovalves.
**ON A/C 106-149, 221-299,
(1) Normal Braking
You get normal braking when:
-
the Green hydraulic high pressure is available,
-
the A/SKID & NOSE WHEEL switch is in the ON position,
-
the PARK BRK control switch is in the OFF position or the PARK BRK control is in the ON position and the parking brake pressure really applied is less than 35 bar (507 psi).
You get the control which is electrical:
1EFF : 001-049, 051-099, 101-149, 151-199, 1 32-40-00Page 3 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1 -through the pedals,
-automatically: on the ground by the autobrake system or in flight when the landing gear control-lever is placed in the UP position during 3 seconds.
No indicator of Normal brake pressure is used.
The regulation is performed on the four Normal brake servovalves.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(2) Alternate Braking with Anti Skid The Alternate braking with anti skid associates the Yellow high pressure with the anti skid regulation. You get this mode automatically:
-
if the Green pressure is not available or falls during braking,
-
if certain failures occur on the Normal system: brake pressure not sufficient after gear extension or anti-skid system failure in flight before landing with gear donwlocked.
The braking modes are shown on the upper ECAM DU.
A hydraulic selector causes changes between the Green and Yellow
systems automatically.
The orders are entered through the pedals only and an auxiliary
low-pressure hydraulic-system transmits them. The pressure supplied
to the left and right brakes is shown on a brake Yellow-pressure
triple-indicator installed on the center instrument panel.
The anti skid system and related indicating are operative.
The regulation is performed on the four Alternate brake servovalves.
(3) Alternate Braking without Anti Skid The Alternate braking without anti skid differs from the above mode in that the anti skid regulation is no longer available. It can be:
-
disconnected electrically (A/SKID & NOSE WHEEL switch in the OFF position or power supply failure),
-
disconnected hydraulically if only the brake Yellow-pressure accumulator supplies the brakes (then the A/SKID & NOSE WHEEL switch can be in any position).
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