-------------------------------------------------------------------------------FIN I FUNCTIONAL DESGINATION I PANELIZONEIACCESS I ATA
I I I I DOOR I REF. -------------------------------------------------------------------------------9CE ACTUATOR-THS 311 27-44-51
MOTOR-THS ACTUATOR, YELLOW 311 312AR 27-44-53 MOTOR-THS ACTUATOR, GREEN 312 312AR 27-44-53 BRAKE - PRESSURE-OFF, THS ACTUATOR, 311 312AR YELLOW BRAKE - PRESSURE-OFF, THS ACTUATOR, 312 312AR GREEN VALVE BLOCK - THS ACTUATOR, YELLOW 311 312AR VALVE BLOCK - THS ACTUATOR, GREEN 312 312AR
3. System Description
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(Ref. Fig. 003)
R The THS actuator moves the THS. The THS actuator is an electro-hydraulic R unit. Its component parts are:
-
two hydraulic motors,
- one pitch trim actuator,
- one fail-safe ball screwjack,
- one mechanical input shaft,
-
two pressure-off brakes,
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two position transducer packs,
- one gear box,
-
two hydraulic valve blocks.
The THS of the aircraft is operated by the THS actuator to get the
longitudinal pitch-trim control of the aircraft.
R Component Location Figure 001
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Component Location
Figure 002
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THS Actuator
Figure 003
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The THS actuator controls the deflection of the THS mechanically by a servosystem. The servosystem has an input signal which is an electrical position sequence, transmitted by the Elevator Aileron Computer (ELAC) and the Spoiler Elevator Computer (SEC). The input signal is transmitted to the PTA which is part of the THS actuator and moves the gear trains of the control loop. A mechanical input link is connected to the gear trains of the control loop through an override mechanism. This permits the pilot to override the ELAC and SEC signals with the control wheel in the cockpit.
If there is a loss of the hydraulic power or control signal, the THS actuator makes sure that the THS is fully immobilized. The two hydraulic systems supply fluid independently to the hydraulic motors. Output force from the hydraulic motors is transmitted to the screw shaft through a power differential gear followed by a reducing gear. Therefore it is possible to operate on one circuit at half of the maximum speed.
The double control loop gear sends the input and the reset signals to the valve blocks.
A comparison system makes sure that the THS actuator is immobilized if one control valve or one of the control gear loops locks. In the normal operation mode, the SEC and the ELAC automatically or electrically signal the pitch trim. The computers transmit the signals to one of the three electric motors of the PTA. The electric motor moves the double control gear loop.
The THS actuator has the subsequent items to make maintenance easier. These items include:
-inspection windows which permit a visual inspection of the power gear teeth,
-a cranking shaft which is used to manually crank the power differential
output shaft. This then permits the release of the pressure-off brakes with a special tool, also to test the pressure-off brakes with both brakes engaged,
-an oil drain port with a magnetic plug,
-the fill and drain adaptors to replace oil,
-an oil breather to keep the interior of the gear box at atmospheric pressure,
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a grease nipple on the flange of the ball nut permits the lubrication of the nut,
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a rigging pin located at the mechanical input to put the stabilizer at the zero degree position,
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