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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-039
Purpose
The purpose of the hydraulic pressure switch is to tell the FCC
when the detent hydraulic pressure gets to the operational
level. The autopilot actuator is then ready to get signals from
the FCC to move the control surfaces.
Physical Description
The switch is approximately 3.6 inches long and has a
maximum diameter of approximately 1.0 inches. The switch
weighs approximately 3.1 ounces. One end of the switch has a
fitting. It attaches to the autopilot actuator. The other end has a
receptacle. It attaches to an electrical connector.
Functional Description
The switch energizes when the hydraulic pressure increases
between 300 and 500 psi. The switch disconnects when the
pressure decreases to between 500 and 300 psi.
DFCS - AUTOPILOT ACTUATOR - HYDRAULIC PRESSURE SWITCH
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - AUTOPILOT ACTUATOR - HYDRAULIC PRESSURE SWITCH
DFCS - AUTOPILOT ACTUATOR - HYDRAULIC PRESSURE SWITCH
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-040
Purpose
The purpose of the solenoid valves (both actuator and detent
solenoids) is to open its valve when it receives an electrical
signal. When the valve opens, it lets hydraulic pressure go to
the components within the autopilot actuator.
Physical Description
Each solenoid is approximately 2.8 inches high and 1.7 inches
in diameter. the solenoid weighs approximately .7 pounds.
These are the three hydraulic ports in the solenoid:
* Pressure for input hydraulic pressure
* Return for the hydraulic fluid to go to the reservoir
* Cylinder for the output of hydraulic pressure.
An electrical connector attaches the wires from the FCC.
Functional Description
When the solenoid receives an electrical signal, it energizes a
hydraulic relay. This lets the hydraulic pressure go from the
pressure port to the cylinder port. When the electrical signal
stops, the pressure at the cylinder port goes to return.
DFCS - AUTOPILOT ACTUATOR - SOLENOID VALVES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-041
DFCS - AUTOPILOT ACTUATOR - SOLENOID VALVES
DFCS - AUTOPILOT ACTUATOR - SOLENOID VALVES
EFFECTIVITY
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22-11-00-041
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DFCS - AUTOPILOT ACTUATOR - SOLENOID VALVES
22-11-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The purpose of the autoflight status annunciator is to show
these annunciations:
* Autopilot warning
* Autopilot disconnect
* Start BITE test
* Autothrottle (A/T) disengage
* Airspeed warning
* Alert messages on the FMC or an FMC fails.
Physical Description
The autoflight status annunciator is 3.25 inches wide, 1.5 inches
high and approximately 5.2 inches deep. The annunciator
weighs approximately 1.1 pounds.
Three warning light annunciators are on the front. The color of
the A/P light can be red or amber. The color of the A/T light can
be red or amber. The FMC light can only be amber. There is
also a three position switch that you can use to do a test of the
lights.
Operation
When you push the test switch to the number 1 position, all
three annunciator lights come on amber. When you push the
test switch to the number 2 position, the A/P and A/T
annunciators come on red. The FMC annunciator comes on
amber.
If the A/P annunciator flashes red, you can turn off that light if
you push the annunciator. If the A/T annunciator flashes red,
you can turn off that light if you push the annunciator. If the FMC
annunciator is amber, you can turn off that light if you push the
annunciator.
Warning Annunciations
The red A/P annunciator flashes when an A/P disconnects. The
red A/P annunciator comes on steady when any of these
　
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