RUDDER TRIM ACTUATION - DESCRIPTION AND OPERATION
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1. General
_______ (Ref. Fig. 001) The rudder trim control is electrically signalled. An electric actuator installed in the tail area drives a trim screwjack via a rotary shaft and universal joints. The actuator is manually controlled via the FACs (Ref. ATA 22) from the control panel located on the center pedestal, at a constant speed. A reset function initiated when you press a RESET pushbutton switch on the control panel permits to null the rudder trim position through the FACs. The rudder trim position is shown on the control panel. The FACs also control the trim actuator in AP mode.
NOTE : The maximum admissible rudder trim limits indicated on the control
____ panel when the aircraft is stabilized in heading with the AP engaged are RH 1 DEG and LH 2.3 DEG.
2. Component Location
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(Ref. Fig. 002)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------10CC ACTUATOR-RUDDER TRIM 325 325AL 27-22-51 9CC CTL SW-RUDDER TRIM 110VU 211 831 22-62-11
INTENTIONALLY BLANK
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Trim (Rudder)
Figure 001
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Location of Rudder Trim Actuation
Figure 002
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3. Component Description
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A. Rudder Trim Actuator
(Ref. Fig. 001)
(1)
The actuator has two 3-phase asynchronous motors installed on the same shaft (but they are electrically independent and controlled by independent plug-in electronic assemblies). The motors are permanently coupled to a reduction gear which drives the output shafts via a torque limiter.
(2)
Non-locking rotary stops limit the actuator stroke.
(3)
The main output shaft is internally duplicated by a second shaft which permits a duplicate recopy (this duplication prevents the loss of the four transducers if there is a single rupture).
(4)
The output shaft drives four inductive transducer units :
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the main output shaft drives the feedback transducer unit of one channel and the monitoring transducer unit of the other channel through a reduction gear
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the internal output shaft drives the other two transducer units in the same manner.
(5)
An externally-visible index on the last actuating gear of one of the transducer units shows the zero position of the output shaft.
(6)
A tapered rigging pin is used to set the output shaft at mid angular travel (zero trim position and zero reference for setting of transducers). There is no damage if a motor is energized with the pin in position.
(7)
The actuator is sealed and has a desiccant patch, the color of which is externally visible.
(8)
Electronic assembly :
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a monitoring output makes the test of the electronic circuitry possible
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a monitoring power supply permits the automatic test of the electronic assembly at each FAC.
B. Maintenance
The component below is a line-replaceable unit (LRU) :
-electronic assembly
4. Control and Indicating
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A. Control Panel
The RUD TRIM control panel includes :
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a RUD TRIM control switch
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a RESET pushbutton switch
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a RUD TRIM indicator
(1)
RUD TRIM control switch This is a 3-position rotary switch spring-loaded to the neutral (center) position. The direction of rudder trim travel depends on the direction of the switch rotation.
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