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a hand grip
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a protection boot
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two axes
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two spring rods for pitch artificial feel
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two springs for roll artificial feel.
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two transducer units ; one for roll, the other one for pitch
- one solenoid to introduce ; in AP mode, a higher threshold to move the side stick out of the zero position.
(1) Transducer units associated to side stick controllers
(Ref. Fig. 012)
-Two identical transducer units are associated to each controller one for roll control, another one for pitch control.
-Four sets of 3 plastic track potentiometers are fitted in each unit.
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R Side Stick Controller Figure 008
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R Side Stick Transducer Unit Internal Wiring Figure 009
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R Side Stick Immobilized In A/P Mode (Principle) Figure 010
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R Side Stick Assembly Figure 011
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R Side Stick Transducer Unit Figure 012
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The design is fail safe from the mechanical inputs (two input levers) to the input drive of each potentiometer set. The purpose of this design is to avoid the loss of the mechanical drive of more than one potentiometer set subsequent to a single mechanical failure.
-The gear ratio between unit input and potentiometer sets is 3. The unit mid stroke position is accurately determined by a rigging pin between input levers and the body. The potentiometers are rigged to mid stroke for this input lever position in the unit manufacturer facilities. Then no electrical rigging is needed when a transducer unit is replaced. The hand grip being maintained to zero by artificial feel threshold and the unit input being fixed to mid stroke by the pin, the length of the two input rods is adjusted to connect each of them to the corresponding input lever. The rigging pin is removed after mechanical connection is achieved.
Ten potentiometers are used in each transducer unit used for roll
control, one potentiometer being associated to each COM and each MON
unit of the 2 ELACs and 3 SECs. The COM and MON units of each
computer do not use potentiometers of the same group.
Only 8 potentiometers, 2 in each group, are used in each transducer
unit used for pitch control.
They are associated to the two ELACs and to SEC 1 and 2. The COM and
MON units of each computer use potentiometers of the same group.
Each potentiometer track power supply is achieved by the associated
computer unit.
The position signal is delivered between the sliding contact and the
mid point of the track.
(Ref. Fig. 009)
For the internal wiring of the SSTU.
B. Speedbrake Control Transducer Unit (Ref. Fig. 013, 014) The speedbrake control is achieved through a specific unit located on the aft left part of the center pedestal. This unit is also used for ground spoiler function pre-selection. The control lever zero position is locked in maximum forward position and the lever is moved in aft direction to extend speedbrakes. It is necessary to push the handle to move the lever out of the zero position.
-Ground spoiler preselection is achieved from zero position by pulling the handle (a slight lever forward position is then induced due to the special mechanical design).
-The input lever drives one end of a fail safe axis which has a friction brake at the other end to provide an artificial feel and to freeze the lever position when it is out of the zero selection.
-A duplicate system is used to drive two sets of 3 plastic track
potentiometers with a gear ratio of 3.
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R Speedbrake Control Transducer Unit Figure 013
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