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at the same speed.
Steady bearings, attached to the structure, support
the torque shafts where small angular changes of
alignment occur.
GEARBOXES
Six gearboxes are used in the slat transmission system
where changes in torque shaft alignment occur.
One 19 degrees bevel gearbox (A) changes alignment
under the wing center box.
One T-gearbox changes (B) alignment through 90 degrees
in each wing.
Two 63.5 degrees bevel gearboxes (C) take drive from
below each wing level into the wing leading edge.
ACTUATORS
The actuators produce the torque and speed reduction
necessary to drive the slats at the required rate.
Each actuator drives its associated slat track through
a pinion driven by the actuator output shaft.
TMUFCTH01-T01 LEVEL 3
EFFECTIVITY 27-84-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 320
ALL
SLAT MECHANICAL DRIVE - PCU - TORQUE SHAFTS - GEARBOXES - ACTUATORS
TMUFCTH01-P01 LEVEL 3
EFFECTIVITY 27-84-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
EFFECTIVITY Page 321
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SLAT MECHANICAL DRIVE
TRACKS
The slats are attached to the forward ends of the
tracks which run in guide rollers.
Slat 1 is supported by four tracks, but only T2 and
T3 are driven.
T1 and T4 prevent slat loss in case of attachment
failure.Slats outboard of the pylon are supported by
two driven tracks.
TORQUE LIMITERS
Each actuator incorporates a bi-directional torque
limiter which protects the structure from overload.
WING TIP BRAKES (WTB)
The Wing Tip Brakes stop and hold the transmission if
the Slat Flap Control Computers detect abnormal
operation such as asymmetry and runaway.
Once applied, the Wing Tip Brakes can only be reset
on the ground by maintenance action via the Centralized
Fault Display System (CFDS).
ASYMMETRY POSITION PICK OFF UNITS (APPU)
The Asymmetry Position Pick Off Units enable the Slat
Flap Control Computers to monitor the system for
asymmetry and runaway conditions.
One Asymmetry PPU is mounted outboard of track 12 in
each wing.
It provides slat actual position to the Slat Flap
Control Computers (SFCC).
TMUFCTH01-T02 LEVEL 3
EFFECTIVITY 27-84-00 Page 4
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 322
ALL
SLAT MECHANICAL DRIVE - TRACKS - WTB - APPU
TMUFCTH01-P02 LEVEL 3
EFFECTIVITY 27-84-00 Page 5
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 323
ALL
SELF EXAMINATION
Why does slat 1 have four tracks ?
A - To prevent slat asymmetry.
B - To prevent slat loss.
C - To prevent structure overload.
Where are the Wing Tip Brakes located ?
A - At the wing tip, outboard of the APPU.
B - Between track 11 and 12, in each wing.
C - Between track 7 and 8, in each wing.
Where are the torque limiters located ?
A - On the torque shafts.
B - On the actuators.
C - On the PCU output shaft.
TMUFCTH01 LEVEL 3
EFFECTIVITY 27-84-00 Page 6
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 324
ALL
27 - FLIGHT CONTROLS
27-50-00 FLAPS MECHANICAL DRIVE D/O
CONTENTS:
Power Control Unit
Torque Shafts
Gearboxes
Actuators
Torque Limiters
Wing Tip Brakes
Asymmetry PPUs
Tracks
Self Examination
TMUFCTI01 LEVEL 3
EFFECTIVITY 27-50-00 Page 1
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 325
ALL
FLAPS MECHANICAL DRIVE D/O
POWER CONTROL UNIT
The Power Control Unit incorporates two hydraulic
motors, each one controlled by an electrically signaled
valve block.
The flap PCU drives the flap transmission output
shafts.
TORQUE SHAFTS
The rotation of the torque shafts drives all gearboxes
and rotary actuator input shafts simultaneously, at
the same speed.
Steady bearings, attached to the structure, support
the torque shafts where small angular changes are
present.
GEARBOXES
Three types of one to one ratio gearboxes are used in
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