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TMUFCLM01 LEVEL 3
EFFECTIVITY 27-40-00 Page 1
Jan 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 95
ALL
THS ACTUATOR OPERATION
HYDRAULIC MOTORS
Both hydraulic motors drive the ball screw actuator
through a power differential gearbox.
It moves up or down a ball nut on which the Trimmable
Horizontal Stabilizer (THS) surface is mounted.
VALVE BLOCKS
One valve block is provided for each hydraulic motor.
PRESSURE OF BRAKES
The pressure-off brakes are applied in case of
hydraulic pressure loss.
ELECTRICAL MOTORS
Three electrical motors are provided.
Each is driven by the Electrical Flight Control System
through its corresponding computer.
Electrical motors are controlled :
- by ELAC 2 for M1,
- by ELAC 1 or SEC 1 for M2,
- by SEC 2 for M3.
POSITION TRANSDUCERS
Position transducers are installed to feed back the
actual position of the override mechanism output and
of the ball screw position to the Electrical Flight
Control System computer.
MANUAL MODE
The THS actuator can be operated manually from the THS
trim hand wheels on the center pedestal in the cockpit.
They have priority over the electric trim thanks to
the override mechanism.
ELECTRIC MODE
Normally the THS actuator is operated by one electrical
trim motor through an Electrical Flight Control System
computer.
Feedback is given to the THS trim hand wheels in the
cockpit.
JAMMING MODE
If one control valve or its driving mechanism is jammed
the hydraulic supply of both hydraulic motors is cut
by the shut-off valve control device in each valve
block.
Both pressure off brakes are applied. The THS is
immobilized and locked.
Reset is possible by depressurization of both hydraulic
systems.
TMUFCLM01-T01 LEVEL 3
EFFECTIVITY 27-40-00 Page 2
Jan 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 96
ALL
TMUFCLM01-P01 LEVEL 3
THS ACTUATOR OPERATION
EFFECTIVITY 27-40-00 Page 3
Jan 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 97
ALL
SELF EXAMINATION
What happens if an electric trim motor fails ?
A - THS electric trim is lost.
B - THS trims at half speed.
C - THS electric trim is fully available.
TMUFCLM01 LEVEL 3
EFFECTIVITY 27-40-00 Page 4
Jan 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 98
ALL
27 - FLIGHT CONTROLS
27-40-00 THS COMPONENTS
CONTENTS:
THS Actuator
Electronic Control Module
Pitch Trim Actuator
Command Position Transducer
Monitor Position Transducer
Valve Block
Valve Block Filter
Hydraulic Motor
Pressure-Off Brakes
TMUFCLU01 LEVEL 3
EFFECTIVITY 27-40-00 Page 1
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 99
ALL
THS COMPONENTS
THS ACTUATOR
IDENTIFICATION
FIN: 9CE
LOCATION
ZONE: 311
ELECTRONIC CONTROL MODULE
IDENTIFICATION
FIN:
LOCATION
ZONE: 311
PITCH TRIM ACTUATOR
IDENTIFICATION
FIN:
LOCATION
ZONE: 311
COMMAND POSITION TRANSDUCER
IDENTIFICATION
FIN:
LOCATION
ZONE: 311
MONITOR POSITION TRANSDUCER
IDENTIFICATION
FIN:
LOCATION
ZONE: 311
TMUFCLU01-T01 LEVEL 3
EFFECTIVITY 27-40-00 Page 2
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 100
ALL
TMUFCLU01-P01 LEVEL 3
THS COMPONENTS - THS ACTUATOR - ELEC CTL MODULE - PITCH TRIM ACTUATOR - CMD POS
TRANSDUCER - MON POS TRANSDUCER - VLV BLOCK - FILTER - HYDRAULIC MOTOR - PRESS OFF BRAKES
EFFECTIVITY 27-40-00 Page 3
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 101
ALL
THS COMPONENTS
VALVE BLOCK
IDENTIFICATION
FIN:
LOCATION
ZONE: 311, 312
VALVE BLOCK FILTER
IDENTIFICATION
FIN:
LOCATION
ZONE: 311, 312
HYDRAULIC MOTOR
IDENTIFICATION
　
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