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circuit breaker last.
DC Power Interruptions and Voltage Transients
If the 28 VDC power interruption is less than 40 msec, there will
be no changes in the mode or output of the DFCS. If the
interruption is more than 40 msec, but less than 7 seconds, the
autopilot will disengage but other functions (F/D modes, trim
functions, and warnings) will continue. If the interruption is
more than 7 seconds, the DFCS will initialize to its initial power
setup.
DFCS - POWER INTERFACE INTRODUCTION
EFFECTIVITY
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DFCS - POWER INTERFACE INTRODUCTION
DFCS - POWER INTERFACE INTRODUCTION
EFFECTIVITY
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Stabilizer Trim Electric Actuator Power
The 115v ac transfer bus 1 supplies three phase ac power to the
stabilizer trim electric actuator.
FCC Power
The 28v dc buses 1 and 2 supply power to their onside flight
control computers (FCC). The 115v ac transfer buses 1 and 2
supply power to the integrated flight system accessory unit
(IFSAU).
The IFSAU uses transformers to change each 115v ac to a 26v
ac sensor excitation power supply. The IFSAU supplies this
power to the onside FCC as a reference voltage for the CWS
force transducers and flap position transmitters.
Mode Control Panel (MCP) Power
The 28v dc buses 1 and 2 supply power to the MCP.
Sensor Excitation Power
The IFSAU supplies excitation power to these sensors:
* Captain pitch control wheel steering (CWS) force transducer
* First officer pitch CWS force transducer
* Roll CWS force transducer
* Right flap position transmitter
* Left flap position transmitter.
The CWS force transducers get excitation power from both 26v
ac transformers. The flap position sensors only get 26v ac
power from their onside transformer.
On Ground Signal
If the airplane is on the ground, the proximity switch electronics
unit (PSEU) sends the 28v dc on ground signal to the FCCs. The
FCCs use this signal to find if the airplane is on the ground or in
the air.
DFCS - POWER INTERFACE
EFFECTIVITY
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DFCS - POWER INTERFACE
DFCS - POWER INTERFACE
EFFECTIVITY
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Autopilot Actuator Excitation Power
The FCCs supply 14v ac, 1800 Hz pitch and roll excitation power
to the autopilot actuators. Each aileron and elevator autopilot
actuator gets excitation power from its onside FCC.
Sensor Excitation Power
The FCCs supply roll excitation power to these sensors:
* Spoiler 4 position sensor
* Spoiler 9 position sensor
* Aileron position sensor.
The FCCs supply pitch excitation power to these sensors:
* Neutral shift sensor
* Elevator surface position sensor
The stabilizer position sensor A gets pitch excitation power
from FCC A. The stabilizer position sensor B gets pitch
excitation power from FCC B.
DFCS - SENSOR AND ACTUATOR EXCITATION POWER
EFFECTIVITY
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DFCS - SENSOR AND ACTUATOR EXCITATION POWER
DFCS - SENSOR AND ACTUATOR EXCITATION POWER
EFFECTIVITY
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General
The FCCs monitor signals from these components to determine
if they can engage the autopilots (A/Ps):
* Hydraulic pressure switches on the aileron and elevator A/P
actuators A and B
* Auto speed brake module
* Capt A/P disengage switch.
Power
The 28v dc buses 1 and 2 send engage interlock power to these
components:
* Hydraulic pressure switches on the aileron and elevator A/P
　
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