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UF94200
EFFECTIVITY Page 313
ALL
SLATS/FLAPS ABNORMAL OPERATION (HALF SPEED)
HYDRAULIC FAILURE
Each SFCC channel monitors the hydraulic pressure for
its associated PCU motor. Signals from the Linear
Variable Differential Transducer (LVDT) are used to
compare the position of the control valve with the
drive command orders.
In this example, a green hydraulic low pressure is
detected by SFCC1.
As soon as the hydraulic pressure drop is detected,
the PCU valve block solenoids are de-energized.
The Pressure Off Brake holds the output shaft of the
green hydraulic motor.
Only the valve block 24CV is energized, so only the
yellow hydraulic motor is operative.
Due to the reaction of one half of the differential
gearbox, the operative yellow motor provides full
output torque at half speed to the gearbox output
shaft. As the green hydraulic system also supplies one
Slat PCU motor, the slat system is affected as well.
TMUFCTD02-T02 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 4
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 314
ALL
TMUFCTD02-P02 LEVEL 3
SLATS/FLAPS ABNORMAL OPERATION (HALF SPEED) - HYDRAULIC FAILURE
EFFECTIVITY
ALL 27-00-00 Page 5
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 315
ALL
SLATS/FLAPS ABNORMAL OPERATION (HALF SPEED)
SPOOL VALVE JAM
In this example, a green control spool valve jam,
causes a flap movement slower than the minimum speed
for two-motor operation.
Each SFCC flap channel monitors the transmission system
for half speed operation.
Such a case can only be detected when both control
spool valves are selected in full speed configuration
(Half speed monitoring).
The half speed monitoring system detects the jammed
spool valve and thus the solenoid valves are
de-energized.
Due to the differential gearbox, the remaining
operative motor provides full differential gearbox
output torque at half speed.
Half speed monitoring is inhibited when the aircraft
is on ground.
TMUFCTD02-T03 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 6
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 316
ALL
SLATS/FLAPS ABNORMAL OPERATION (HALF SPEED) - SPOOL VALVE JAM
TMUFCTD02-P03 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 7
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 317
ALL
SELF EXAMINATION
With a flap PCU spool valve jam, what level of
caution is generated ?
A - A level 1 caution.
B - A level 2 caution.
C - A level 3 caution.
When is the half speed monitor active ?
A - As soon as a directional valve is
energized.
B - When the control valve is in full speed
position.
C - Always.
SFCC1 flap channel has failed. What are the
consequences for the flap system ?
A - The flap system is locked by the WTB.
B - The flap system is not affected.
C - The flap system operates at half speed.
TMUFCTD02 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 8
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 318
ALL
27 - FLIGHT CONTROLS
27-84-00 SLAT MECHANICAL DRIVE
CONTENTS:
General
Power Control Unit (PCU)
Torque Shafts
Gearboxes
Actuators
Tracks
Torque Limiters
Wing Tip Brakes (WTB)
Asymmetry Position Pick Off Units (APPU)
TMUFCTH01 LEVEL 3
EFFECTIVITY 27-84-00 Page 1
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 319
ALL
SLAT MECHANICAL DRIVE
GENERAL
Torque shafts and gearboxes transmit power from the
Power Control Unit (PCU) to actuators which drive the
slat operating mechanism.
POWER CONTROL UNIT (PCU)
The Power Control Unit (PCU) incorporates two hydraulic
motors, each controlled by an electrically signaled
valve block.
The slat PCU drives the slat transmission system via
a single output shaft.
TORQUE SHAFTS
The rotation of the torque shafts drives all gearboxes
and rotary actuator input shafts simultaneously and
　
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