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actuators A and B
* Auto speed brake module
* F/O A/P disengage switch
* Radio Altimeter (R/A) < 10 feet relays A and B
* FCC A and B.
Hydraulic Pressure Switches
Each A/P actuator has a hydraulic pressure switch. When the
hydraulic pressure is high, the switches close and send 28v dc
to the FCCs. The switch must be open to show no pressure to
engage the autopilot. The switch must close within 3.5 seconds
to show the actuator has hydraulic pressure to keep the
autopilot engaged.
Auto Speed Brake Module
When the wheels spin up during landing and the speed is more
than 60 knots, the auto speed brake module sends 28v dc to the
FCCs. The FCCs use this signal to disengage the autopilot if goaround
is started after the airplane touches down.
A/P Disengage Switches
Normally, 28v dc goes through both A/P disengage switches to
the FCCs. If either the captain or the first officer pushes the A/P
disengage switch, 28v dc does not go to the FCCs. This will
disengage the autopilots or remove the disengage warning if
the autopilots are disengaged.
Speed Brake Deployment Signal
When the FCC calculates that the radio altitude is less than 10
feet, it sends a ground to the R/A<10 FT relay. This relay is an
input to the speed brake deployment circuit.
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General
These components also get power from the engage interlock
circuit breakers:
* MCP
* IFSAU
* Annunciator and dim module.
IFSAU
The IFSAU has isolation diodes that let the engage interlock
power go to these components:
* Main electric stabilizer trim relay
* Autopilot stabilizer trim cutout relay.
Main Electric Stabilizer Trim Relay
When the trim relay is in the off position, the AFCS engage
interlock power goes to the FCCs. This signal tells the FCC that
the manual electric trim is not operating. When the manual
electric trim switches operate, the relay goes to the trim
position and the power does not go to the FCCs. This causes the
autopilot to disengage.
Autopilot Stabilizer Trim Cutout Relay
When the cutout relay is in the normal position, the AFCS
engage interlock power goes to the FCCs. This lets the autopilot
engage. If the relay is in the cutout position, the power does not
go to the FCCs and the autopilot cannot engage.
Annunciator and Dim Module
The annunciator and dim module uses the AFCS engage
interlock power for the stab out of trim annunciator light.
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General
These components have an interface with the FCC annunciation
and warning circuits:
* Capt and F/O A/P disengage switches
* IFSAU
* MCP
* FCC A and B
* Capt and F/O autoflight status annunciators (ASA)
* Aural warning module
* Flight data acquisition unit (FDAU)
* A/T computer
* Remote electronics unit (REU).
Power
The 28v dc switched hot battery bus supplies power for the
autopilot warning circuits. The circuit breaker for the A system
supplies power to these components:
* FCC A
* Capt and F/O A/P disengage switches
* IFSAU
* Capt ASA.
The circuit breaker for the B system supplies power to these
components:
* FCC B
* IFSAU
　
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