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the flap transmission where large changes in torque
shaft alignment are present.
A right angle gearbox changes alignment through 90
degrees for input to track 1 offset gearbox.
A line gearbox transmits the drive along the rear face
of the rear false spar.
A 19 degree bevel gearbox aligns the drive with the
rear spar.
ACTUATORS
One actuator operates the flap mechanism at each track.
It provides the torque and speed reduction necessary
to drive the flap at the required rate.
Each actuator is driven by an offset gearbox which
transmits power from the torque shaft to the plug-in
rotary actuator.
TORQUE LIMITERS
Each actuator incorporates a bi-directional torque
limiter which protects the structure from overload.
WING TIP BRAKES
The Wing Tip Brakes stop and hold the transmission if
the Slat Flap Control Computers detect abnormal
operation such as asymmetry, runaway or overspeed.
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 (APPUs)
The Asymmetry Position Pick off Units enable the Slat
Flap Control Computers to monitor the system for
asymmetry and runaway conditions.
One Asymmetry Position Pick off Unit (APPU) is mounted
on the offset gearbox at track 4 in each wing. It
provides flap actual position to the Slat Flap Control
Computers (SFCC).
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FLAPS MECHANICAL DRIVE D/O
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FLAPS MECHANICAL DRIVE D/O
TRACKS
Flaps are supported on carriages traveling on straight
tracks. A link arm, outboard of each track, transmits
drive from the actuator to the flap.
Tracks 2, 3 and 4 are similar. Track 1, attached to
the fuselage, uses a different configuration.
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TMUFCTI01-P02 LEVEL 3
FLAPS MECHANICAL DRIVE D/O - TRACKS
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SELF EXAMINATION
Where are the Wing Tip Brakes located ?
A - At the wing tips
B - Between tracks 3 and 4 in each wing
C - Attached to track 4 offset gearbox
Where are the torque limiters located ?
A - On the actuator offset gearbox
B - On the actuator drive lever
C - On the steady bearing
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EFFECTIVITY 27-50-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
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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
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
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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
the flap transmission where large changes in torque
shaft alignment are present.
A right angle gearbox changes alignment through 90
degrees for input to track 1 offset gearbox.
A line gearbox moves drive path onto the rear face of
the rear false spar.
A 19 degree bevel gearbox aligns the drive with the
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