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Manual Normal Braking
Inflight Braking
Parking Brake
Alternate Braking with Anti-Skid
Alternate Braking without Anti-Skid
Self Examination
TMULDZ101 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 1
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 137
ALL
WHEELS AND BRAKE - BRAKES SYSTEM PRESENTATION
The four braking modes available depend on :
- the hydraulic system,
- the position of the A/SKID & N/W STRG switch
and PARKING BRK control switch.
NORMAL BRAKING
Normal braking is obtained when :
- the green high hydraulic pressure is available,
- the A/SKID & N/W STRG switch is in the "ON"
position,
- the PARKING BRK control switch is in the "OFF"
position.
Electrical control is obtained :
- through the pedals,
- automatically : on the ground by the auto brake
system or in flight when the landing gear
control lever is set to "UP".
No indicator of normal brake pressure is used.
NORMAL BRAKING BY AUTO BRAKE
Before landing, the crew can select one of the AUTO
BRAKE modes to obtain the optimal deceleration rate
compatible with the length of the runway.
Before take-off, MAX mode must be selected in case of
an aborted take-off.
When a pushbutton deceleration rate is selected, the
"ON" light comes on blue to indicate the positive
arming of the auto brake mode.
Braking begins when ground spoilers deployment orders
are present.
The Braking and Steering Control Unit (BSCU) energizes
the selector valve allowing green pressure to supply
the brakes through the automatic selector and normal
servovalves.
The automatic reversible selector, when powered by the
green hydraulic system cuts the yellow one.
Depending on the deceleration rate and the anti-skid
regulation, the BSCU regulates the pressure delivered
to each brake through the normally open normal
servovalves.
Wheels rotation speed and ADIRU data are supplied to
the BSCU for braking and anti-skid computation.
When the aircraft deceleration reaches a given value,
the "DECEL" green light comes on.
TMULDZ101-T01 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 2
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 138
ALL
BRAKE SYSTEM PRESENTATION - NORMAL BRAKING BY AUTOBRAKE
TMULDZ101-P01 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 3
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 139
ALL
WHEELS AND BRAKES - BRAKE SYSTEM PRESENTATION
MANUAL NORMAL BRAKING
Electrical braking orders are sent by the pedals to
the Braking and Steering Control Unit (BSCU).
The BSCU energizes the selector valve allowing green
pressure to supply the brakes through the automatic
selector and normal servovalves.
The automatic reversible selector, when powered by the
green hydraulic system cuts the yellow one.
Depending on manual braking orders and anti-skid
regulation, the BSCU regulates the pressure delivered
to each brake through the normally open servovalves.
Wheel rotation speed, braking pressure and ADIRU data
are supplied to the BSCU for braking and anti-skid
computation.
TMULDZ101-T02 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 4
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 140
ALL
BRAKE SYSTEM PRESENTATION - MANUAL NORMAL BRAKING
TMULDZ101-P02 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 5
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 141
ALL
WHEELS AND BRAKES - BRAKE SYSTEM PRESENTATION
INFLIGHT BRAKING
In order to stop the main landing gear wheels rotation
before entry into the landing gear bay, a preprogrammed
brake pressure is released to the normal brakes.
When the landing gear control lever is set to "UP",
the BSCU opens the selector valve and energizes the
servovalves.
The brake pressure is released either when the nose
gear is no longer downlocked or three seconds after
the "UP" selection.
Furthermore, nose wheels are mechanically braked at
the end of the gear retraction cycle using brake bands.
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