DOC AIRBUS | AMM A320FRUDDER CONTROL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
Rudder Mechanical Control ** ON A/C NOT FOR ALL
Rudder Mechanical Control ** ON A/C NOT FOR ALL
Rudder Mechanical Control ** ON A/C NOT FOR ALL
Three mechanically-controlled fixed-body servocontrols operate the rudder.
Two interconnected pairs of pedals drive a mechanical linkage. This linkage is single up to the artificial feel and trim unit and up to the actuating lever of the middle servocontrol.
An adjuster which consists of a lever-controlled rack assembly is used to adjust the position of the pedal assembly.
Downstream of the actuating lever of the middle servocontrol, the linkage is duplicated up to the travel limitation unit (which is fail safe).
Thus, any single disconnection does not involve a loss of travel limitation without a loss of rudder control. This is to avoid a hidden failure of the travel limitation due to single failure.
The yaw damper signals are introduced through a differential mechanism, located downstream of the aft cable run.
** ON A/C NOT FOR ALL Rudder Mechanical Control ** ON A/C NOT FOR ALL Rudder Mechanical Control ** ON A/C NOT FOR ALL Rudder Mechanical Control ** ON A/C NOT FOR ALL Two interconnected pairs of pedals drive a mechanical linkage. This linkage is single up to the artificial feel and trim unit and up to the actuating lever of the middle servocontrol.
An adjuster which consists of a lever-controlled rack assembly is used to adjust the position of the pedal assembly.
Downstream of the actuating lever of the middle servocontrol, the linkage is duplicated up to the travel limitation unit (which is fail safe).
Thus, any single disconnection does not involve a loss of travel limitation without a loss of rudder control. This is to avoid a hidden failure of the travel limitation due to single failure.
The yaw damper signals are introduced through a differential mechanism, located downstream of the aft cable run.
2. Component Location.
** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 103CM | TENSION REG-RUDDER CONTROL CABLE | 121 | 27-21-45 | ||
3. Component Description
A. Cable Tension Regulator FIN: 103-CM
One cable tension regulator maintains a constant tension on the cable (22 daN plus or minus 3 daN (49.5 lbf plus or minus 7 lbf)).
It has a provision for the installation of a special tool used to install the regulator on the aircraft.
One cable tension regulator maintains a constant tension on the cable (22 daN plus or minus 3 daN (49.5 lbf plus or minus 7 lbf)).
It has a provision for the installation of a special tool used to install the regulator on the aircraft.
B. Servocontrol Actuating Spring Rod
The actuating spring rod of the rudder servocontrol prevents the runaway of the control system if an input lever jams on its servocontrol body.
It permits the control of the other two servocontrols if a spool valve jams.
The actuating spring rod of the rudder servocontrol prevents the runaway of the control system if an input lever jams on its servocontrol body.
It permits the control of the other two servocontrols if a spool valve jams.
C. Centering Spring Rod of the Upper and Middle Servocontrols
This centering spring-rod is used in the event of a rupture or disconnection of the linkage between the artificial feel and the middle-servocontrol actuating lever.
It avoids a rudder deflection greater than 2 deg. with vertical acceleration Mz = 1g and greater than 15 deg. with vertical acceleration Mz = 2.5g .
This centering spring-rod is used in the event of a rupture or disconnection of the linkage between the artificial feel and the middle-servocontrol actuating lever.
It avoids a rudder deflection greater than 2 deg. with vertical acceleration Mz = 1g and greater than 15 deg. with vertical acceleration Mz = 2.5g .
D. Rods, Cables
(1) Rods
The push-pull rods are adjustable or non-adjustable length rods. They have replaceable ends.
The push-pull rods are adjustable or non-adjustable length rods. They have replaceable ends.
(2) Cables
The flexible cables (3.2 mm/0.126 in. dia.) are made of zinc-coated carbon steel.
The cable end-fittings are foolproofed and turnbuckles are clip-locked.
The fairleads are of the static type.
Their supports permit the passage of the cable end-fittings.
At bulkheads, the cables are fed through pressure seals.
The flexible cables (3.2 mm/0.126 in. dia.) are made of zinc-coated carbon steel.
The cable end-fittings are foolproofed and turnbuckles are clip-locked.
The fairleads are of the static type.
Their supports permit the passage of the cable end-fittings.
At bulkheads, the cables are fed through pressure seals.
(3) Rods
The push-pull rods are adjustable or non-adjustable length rods. They have replaceable ends. In order to eliminate the influence of extreme temperature differences between outside and inside the rudder, the control rods on the rudder mechanical linkages are made of carbon fiber.
The push-pull rods are adjustable or non-adjustable length rods. They have replaceable ends. In order to eliminate the influence of extreme temperature differences between outside and inside the rudder, the control rods on the rudder mechanical linkages are made of carbon fiber.
(4) Cables
The flexible cables (3.2 mm/0.126 in. dia.) are made of zinc-coated carbon steel.
The cable end-fittings are foolproofed and turnbuckles are clip-locked.
The fairleads are of the static type.
Their supports permit the passage of the cable end-fittings.
At bulkheads, the cables are fed through pressure seals.
The flexible cables (3.2 mm/0.126 in. dia.) are made of zinc-coated carbon steel.
The cable end-fittings are foolproofed and turnbuckles are clip-locked.
The fairleads are of the static type.
Their supports permit the passage of the cable end-fittings.
At bulkheads, the cables are fed through pressure seals.
E. Stops and Rigging Facilities
(1) Pedal stops.
Pedal maximum travel is limited in both directions by non adjustable stops.
Pedal maximum travel is limited in both directions by non adjustable stops.
(2) Rudder operational stops.
Maximum input to the servocontrols is limited by the travel limitation unit.
Maximum input to the servocontrols is limited by the travel limitation unit.
(3) Rudder travel stops.
These are the stroke end stops (non adjustable) of the servocontrols, never reached in normal operation.
These are the stroke end stops (non adjustable) of the servocontrols, never reached in normal operation.
(4) Rudder structural stops when the servocontrols are not installed.
There are no specially designed stops between the rudder and the structure of the vertical stabilizer.
There are no specially designed stops between the rudder and the structure of the vertical stabilizer.
(5) Adjustable lever.
The length of one of the levers between the pedals and the tension regulator is adjustable in order to maintain maximum travel of the rudder within the design limits.
The length of one of the levers between the pedals and the tension regulator is adjustable in order to maintain maximum travel of the rudder within the design limits.
(6) Rigging pins.
Rigging pin holes are provided.
Rigging pin holes are provided.
(7) Pedal stops.
Pedal maximum travel is limited in both directions by non adjustable stops.
Pedal maximum travel is limited in both directions by non adjustable stops.
(8) Rudder operational stops.
Maximum input to the servocontrols is limited by the travel limitation unit.
Maximum input to the servocontrols is limited by the travel limitation unit.
(9) Rudder travel stops.
These are the stroke end stops (non adjustable) of the servocontrols, never reached in normal operation.
These are the stroke end stops (non adjustable) of the servocontrols, never reached in normal operation.
(10) Rudder structural stops when the servocontrols are not installed.
There are no specially designed stops between the rudder and the structure of the vertical stabilizer.
There are no specially designed stops between the rudder and the structure of the vertical stabilizer.
(11) Rigging pins.
Rigging pin holes are provided.
Rigging pin holes are provided.
(12) Pedals position adjustment.
The rudder pedals adjustment range is approximately 0 to 12 graduations.
The rudder pedals adjustment range is approximately 0 to 12 graduations.