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move.
Autopilot Engagement
When you engage the autopilot, a signal from the mode control
panel (MCP) energizes the actuator solenoid. This pressurizes
the transfer valve and the detent solenoid. The detent control
engage orifice that is between the actuator and detent solenoids
does these two things:
* It keeps the maximum flow to the pressure regulator to a
limit to protect from hydraulic overpressure
* Gives a time delay for synchronization.
Synchronization of the Autopilot Actuator
The control surface position sensor (aileron or elevator) sends
a signal through the FCC to the transfer valve. This moves the
main piston to a position that aligns with the position of the
internal output crank. When this is synchronized, it prevents a
sudden movement of the control surface when the FCC
engages the detent solenoid.
After the main piston and the internal output crank are
synchronized, the FCC sends a signal to energize the detent
solenoid. This pressurizes the detent pistons and they touch the
sides of the internal output crank. The pressure regulator keeps
the hydraulic pressure at a safe limit. The hydraulic pressure
also closes the hydraulic pressure switch. The switch sends a
signal to the FCC to show that the autopilot actuator is ready to
operate.
Normal Operation
A command signal from the FCC A/P to the transfer valve
causes the main piston to move. A movement of the main piston
now causes a movement of the output crank and the control
surface. The rate limiting orifices control the rate of movement
of the main piston.
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Camout
A camout condition is when the main piston moves but the
detent pistons cannot move with the main piston. Therefore, the
output crank does not move with the main piston. Camout lets
the pilot mechanically override the autopilot and also gives
protection against hardover failures.
Mechanical Override
When CWS is not the active mode, the pilot can mechanically
override the autopilot actuator. A force of approximately 25
pounds on the control column or wheel can override the
actuator. If both channels A and B are active, approximately 50
pounds of force is necessary to override the two actuators. The
relief valve opens when override pressure goes to the detent
pistons.
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Purpose
The purpose of the transfer valve is to get an electrical signal
from the FCC and control the hydraulic pressure to the main
piston.
Physical Description
The transfer valve is approximately 1.5 inches high and about
1.6 inches in diameter. It weighs approximately 1 pound. These
are the four hydraulic ports:
* Input pressure port for the jet pipe controller
* Return port
* Two output ports for the two sides of the main piston.
A four pin electrical connector attaches the wires from the FCC.
Functional Description
When an electrical signal comes from the FCC, it moves the jet
pipe in the transfer valve. This causes the pressure at each end
of the control spool to change. This causes the control spool to
move which changes the output pressure in each of the two
output ports. The autopilot actuator uses this change in the
output lines to move the main piston.
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