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UF94200
EFFECTIVITY Page 253
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WHEELS AND BRAKES - BRAKE COOLING SYSTEM COMPONENTS
FAN MOTOR
IDENTIFICATION
FIN: 7GS (WHEEL 1), 9GS (WHEEL 2), 8GS (WHEEL 3),
10GS (WHEEL 4)
LOCATION
ZONE: 731 (WHEEL 1 & 2), 741 (WHEEL 3 & 4)
DESCRIPTION
The three phase fan motor is installed in the wheel
axle, where an adaptor assembly holds it in position.
Note that the tachometer drive shaft passes through
the hollow shaft of the fan motor and the shroud drives
the tachometer.
IMPELLER
IDENTIFICATION
FIN: 2789GM (WHEEL 1), 2790GM (WHEEL 2),
2791GM (WHEEL 3), 2792GM (WHEEL 4)
LOCATION
ZONE: 731 (WHEEL 1 & 2), 741 (WHEEL 3 & 4)
DESCRIPTION
The impeller creates a flow of air from the heat pack
to the exterior through the debris guard.
TMULDFX01-T01 LEVEL 3
EFFECTIVITY 32-48-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
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BRAKE COOLING SYSTEM COMPONENTS - FAN MOTOR - IMPELLER
TMULDFX01-P01 LEVEL 3
EFFECTIVITY 32-48-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
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THIS PAGE INTENTIONALLY LEFT BLANK
TMULDFX01 LEVEL 3
EFFECTIVITY 32-48-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
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32 - LANDING GEAR
32-51-00 NOSE WHEEL STEERING SYSTEM
PRESENTATION
CONTENTS:
Controls
Pedals
Disconnect Pushbutton
BSCU
Activation
Towing Control Lever
Self Examination
TMULD1003 LEVEL 1
EFFECTIVITY 32-51-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 257
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NOSE WHEEL STEERING SYSTEM PRESENTATION
The nose wheel steering system is hydraulically powered
and controlled by an electrical servomechanism from
the cockpit via the Braking and Steering Control Unit
(BSCU).
CONTROLS
Steering is controlled by two handwheels and the rudder
pedals depending on aircraft speed. Their signals are
algebraically added if they are operated
simultaneously.
Steering angle speed limitation shown on the schematic
below.
PEDALS
Steering orders from the pedals are sent to the BSCU,
via the Elevator Aileron Computer which also receives
autopilot steering signals.
The resulting signal is algebraically added to the
handwheel signals in the BSCU.
DISCONNECT PUSHBUTTON
When a rudder pedal disconnect pushbutton is pressed
in, nose wheel steering by the pedals is disconnected.
NOTE: The disconnect pushbuttons are also used during
rudder ground check.
BSCU
The A/SKID & N/W STRG switch enables electrical power
supply of the BSCU which computes the steering orders.
ACTIVATION
Steering signals are sent to the hydraulic block when
the arming conditions are met.
The steering hydraulic block is powered by green
pressure if the nose gear doors are closed.
NOTE: Steering is lost after gear gravity extension
as the doors remain open.
TOWING CONTROL LEVER
A lever on the towing electrical box located on the
nose landing gear enables the steering system to be
deactivated for towing purposes.
With the control lever in towing position:
- The maximum towing angle is ± 95°,
- The ECAM MEMO DISPLAY shows N WHEEL STEER
DISC in green, which changes to amber if
one engine is running.
TMULD1003-T01 LEVEL 1
EFFECTIVITY 32-51-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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NOSE WHEEL STEERING SYSTEM PRESENTATION
TMULD1003-P01 LEVEL 1
EFFECTIVITY 32-51-00 Page 3
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SELF EXAMINATION
What is the maximum nose wheel steering angle
obtained by the handwheels?
A - ± 6°.
B - ± 74°.
C - ± 95°.
Is nose wheel steering available after a landing
gear gravity extension ?
A - Yes.
B - No.
TMULD1003 LEVEL 1
EFFECTIVITY 32-51-00 Page 4
Oct 31/99
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