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RUDDER CONTROL -RUDDER TRIM CONTROLS AND TRIM ACTUATOR
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RUDDER CONTROL -RUDDER TRIM POSITION TRANSDUCER
Purpose
The rudder trim position transducer sends a feedback electrical signal to the R ACE. This measures the position of the rudder trim actuator.
Physical Description
The position transducer is an LVDT. The ACE supplies 7v ac, 1800 Hz excitation power.
The rudder trim position transducer is the same as the six wheel position transducers, the six column position transducers, and the four pedal position transducers.
The cable side of the rudder trim position transducer connects to a bracket on the structure of the left shaft assembly mechanism. The adjustable side of the rudder trim actuator connects to the lever of the feel and centering mechanism.
The rudder trim position transducer has an electrical cable which connects to an ACE connector bracket.
Location
The rudder trim position transducer is on the left side, outboard of the nose gear wheel well. Access is through the MEC, along the left side of the nose gear wheel well.
Functional Description
When the rudder trim actuator moves, the movement of the lever of the feel and centering mechanism causes the rudder trim position transducer to extend or retract. The position transducer sends an analog electrical signal to the R ACE.
Indications
When the rudder trim position transducer is defective, the rudder trim system does not operate. The advisory message THRUST ASYM COMP and the status message FLIGHT CONTROL SYS then show.
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RUDDER CONTROL -RUDDER TRIM POSITION TRANSDUCER
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RUDDER CONTROL -RUDDER PEDAL POSITION TRANSDUCERS
Purpose
The four rudder pedal position transducers measure the position of the rudder pedals. The transducers send analog electrical signals to the ACEs.
Physical Description
Each position transducer is an LVDT. The ACEs supply 7v ac, 1800 Hz excitation power.
The four rudder pedal position transducers are identical to the six wheel position transducers, the six column position transducers and the rudder trim position transducer.
Two rudder pedal position transducers are on the right shaft assembly and two are on the left shaft assembly. The position transducers attach at one end to the support structure of the shaft assembly mechanisms. They attach to the transducer crank at the other end.
Each transducer crank attaches to its shaft assembly with a spline. The spline has a missing tooth to help locate the crank on the shaft. Each transducer crank has two shear rivets to allow override of a jammed position transducer.
Each position transducer has an electrical cable which connects to the ACE connector bracket. This bracket has two receptacles, one for each position transducer. The order in which each position transducer connects to the connector bracket determines the transducer-to-ACE relationship.
Location
The four rudder pedal position transducers are outboard of the nose gear wheel well. Access is through the MEC, then along either side of the nose gear wheel well.
Functional Description
When the right and left shaft assemblies rotate in response to a rudder pedal command, the rudder pedal position transducers extend or retract. Each position transducer sends an analog electrical signal to one ACE.
Indications
When one or more pedal position transducer is defective, the status message FLIGHT CONTROL SYS shows.
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RUDDER CONTROL -RUDDER PEDAL POSITION TRANSDUCERS
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RUDDER CONTROL -FRICTION BRAKE
Purpose
The friction brake supplies a resistive force to the movement of the rudder pedal forward controls. This resistive force is equivalent to the typical resistance of a cable-controlled system.
Physical Description
The friction brake is an LRU and weighs about 2.5 lb (1.1 kg).
The friction brake is in a casing which connects to the structure of the right shaft assembly mechanism. The casing contains a rotor which connects by a spline to the right shaft assembly.
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