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EFFECTIVITY 32-42-00 Page 4
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 158
ALL
32 - LANDING GEAR
32-42-00 WHEELS AND BRAKES - ANTI-SKID
FUNCTION
CONTENTS:
Purpose
BSCU
Principle
Regulation
Servovalves
ADIRU
Self Examination
TMULD2004 LEVEL 3
EFFECTIVITY 32-42-00 Page 1
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 159
ALL
WHEELS AND BRAKES - ANTI-SKID FUNCTION
PURPOSE
The anti-skid system gives the maximum braking
efficiency as it keeps each individual wheel at the
maximum deceleration rate avoiding a skidding
configuration.
BSCU
The Braking and Steering Control Unit (BSCU) provides
anti-skid control during normal and alternate braking
by either system 1 or 2 of the BSCU.
System 1 and 2 have independent power supplies, and
at each energization, the first system supplied takes
control.
If the two systems are supplied simultaneously system 1
has priority and system 2 is in standby.
PRINCIPLE
The speed of each main gear wheel, given by a
tachometer, is compared with the aircraft speed
supplied by the Air Data Inertial Reference Units.
A reference speed is determined by the BSCU from the
longitudinal deceleration given by Air Data Inertial
Reference Units 1, 2 or 3 (ADIRU).
When the speed of a wheel decreases below 0.87 times
the reference speed, brake release orders are given
to that wheel to maintain the wheel deceleration rate
at that value.
REGULATION
The operational amplifier compares the calculated
reference speed with the speed of the decelerating
wheel.
The operational amplifier supplies numerical values
which are converted into current to supply the coil
of the normal and alternate servovalves in use to
ensure the anti-skid function.
SERVOVALVES
The normal and alternate servovalves are identical but
connected differently to the BSCU.
While the two coils of the normal servovalve are
connected to system 1 and 2 respectively, only one
coil of the alternate servovalve is used.
ADIRU
The required reference speed during braking is directly
obtained from the average between the values from the
three Air Data Inertial Reference Units (ADIRUs).
In case the ADIRU data is not valid, the reference
speed is equal to the maximum of either main landing
gear wheel speeds. Aircraft deceleration is limited
to 1.7 m/s2 (5.6 ft/s2).
TMULD2004-T01 LEVEL 3
EFFECTIVITY 32-42-00 Page 2
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 160
ALL
ANTI-SKID FUNCTION
TMULD2004-P01 LEVEL 3
EFFECTIVITY 32-42-00 Page 3
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 161
ALL
SELF EXAMINATION
When does the BSCU provide anti-skid control?
A - During normal and alternate braking.
B - Only during normal braking.
C - When the auto brake system has failed.
What happens when a wheel speed decreases below
0.87 times the reference speed?
A - A brake release order is given to the
wheels of the same gear.
B - A brake release order is given to the
related wheel.
C - A brake release order is given to all
wheels.
TMULD2004 LEVEL 3
EFFECTIVITY 32-42-00 Page 4
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 162
ALL
32 - LANDING GEAR
32-40-00 WHEELS AND BRAKES - BRAKE
HYDRAULIC SYSTEM OPERATION
CONTENTS:
Normal Braking
Alternate Braking with Anti-Skid
Alternate Braking without Anti-Skid
Parking Brake
Self Examination
TMULDGT05 LEVEL 3
EFFECTIVITY 32-40-00 Page 1
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 163
ALL
WHEELS AND BRAKES - BRAKE HYDRAULIC SYSTEM OPERATION
The hydraulic braking architecture is shown with all
components. Note that only their main functions are
shown.
NORMAL BRAKING
The hydraulic braking operation is identical for
automatic braking, manual braking and inflight
braking.
Note that during inflight braking, anti-skid function
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