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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 (WTB) 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).
TMUFCTI02-T01 LEVEL 3
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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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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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27 - FLIGHT CONTROLS
27-54-00 FLAPS DRIVE STATION D/O
CONTENTS:
General
Flap Drives
Flap and Track Fairings
Self Examination
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FLAPS DRIVE STATION D/O
GENERAL
Each flap is supported by carriages which run on tracks
extending from the wing rear spar. Each carriage has
a containment device to hold it on the track if a
failure occurs.
The carriages, tracks and beams at tracks 2, 3 and 4
are of similar construction.
Track 1 is attached to the fuselage.
TMUFCBG02-T01 LEVEL 3
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FLAPS DRIVE STATION D/O - GENERAL
TMUFCBG02-P01 LEVEL 3
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FLAPS DRIVE STATION D/O
FLAP DRIVES
Carriage 1 is suspended below the track and travels
on four vertical load and two side-load rollers.
The rollers contain bearings which are
grease-lubricated via grease points on the carriage.
Carriages 2, 3 and 4 are retained on their track by
six vertical and four side-load rollers.
The rollers are lubricated through grease points at
the front and rear of the carriage.
　
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