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* F/O ASA.
A/P Disengage Switches
When you push the A/P disengage switch once, the switch stops
28v dc power from going to these components:
* FCC A
* FCC B
* MCP.
This signal disengages the active autopilot.
When you push the A/P disengage switch a second time, the
switch stops the disengage aural warning. It also turns off the A/
P red flashing warning light on the ASAs.
IFSAU
The power from the two circuit breakers go to the IFSAU where
it goes through isolation diodes to give 28v dc power to the
MCP.
FCC
The FCC A sends an airspeed warning signal to the capt ASA to
cause the amber A/T light to flash. FCC B sends an airspeed
warning signal to the F/O ASA to cause the amber A/T light to
flash. This signal occurs if the FCC finds that the A/T system
cannot hold the airspeed.
The two FCCs send an altitude alert aural warning signal to the
REU. This gives the alert tone in the headsets and the speakers.
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-013
The FCCs send an A/P warning signal to the capt and F/O ASAs
and to the FDAU to turn the red A/P lights on steady. This signal
occurs if any of these conditions are present:
* The two FCCs are not compatible
* The DFCS is in BITE
* The stab trim warning is active and the FCC is in dual
approach below 800 feet.
MCP
The MCP sends an A/P warning signal to the capt and F/O ASAs
to turn the flashing red A/P lights on when the A/P disconnects.
It sends an A/P warning signal to both ASAs to turn the steady
red A/P lights on when these conditions occur:
* An FCC fails the power up test on the ground
* During A/P go-around the FCC cannot acquire the MCP
altitude
* The MCP bus fails during A/P pitch go-around.
The MCP also sends the A/P warning signal to the FDAU. The
MCP sends an A/P horn signal to the aural warning module to
give the A/P disconnect aural warning.
Autoflight Status Annunciators
When you push the A/P light on either ASA, it sends an autopilot
(A/P) warning reset signal to both FCCs and to the MCP. When
you push the A/T light on either ASA, it sends an autothrottle (A/
T) warning reset signal to the FCCs and to the A/T computer.
DFCS - ANNUNCIATION AND WARNING POWER INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 36
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-013
DFCS - ANNUNCIATION AND WARNING POWER INTERFACE
DFCS - ANNUNCIATION AND WARNING POWER INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 37
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-013
General
During a dual channel operation, each FCC must be on an
isolated power source. FCC A gets dc power from DC bus 1 and
FCC B gets dc power from DC bus 2. Normally, the two dc buses
are connected with the bus tie relay. If either FCC is in the active
G/S mode, it will cause the bus tie relay to open. This will
separate the DC power sources to the two FCCs.
These components are part of the circuit that controls the bus
tie relay:
* FCC A and B
* Bus power control unit
* IFSAU
* Standby power control unit.
Power
The hot battery bus supplies 28v dc power to one side of the bus
tie relay.
FCC
When either FCC A or FCC B is in the active G/S mode, it sends
a DC bus isolation signal to the IFSAU. This signal engages a
relay to the G/S engage position.
Standby Power Control Unit
When power is normal, the tie close signal energizes an
electronic switch. This switch supplies a ground to the IFSAU.
IFSAU
When the IFSAU relay is in the G/S not engaged position, the
ground from the bus transfer switch goes to the bus tie relay. If
a G/S engaged signal comes from an FCC, the IFSAU relay
goes to the G/S engaged position and the ground goes away
from the bus tie relay.
Bus Tie Relay
When a ground comes from the IFSAU, the relay closes. This
connects the two 28v dc buses together. If there is no ground
from the IFSAU, the relay is not energized. Therefore, the two
28v dc buses are isolated.
Bus Power Control Unit
Normally the transformer rectifier (TR) units get their power
from different 115v ac generator buses. If a transfer occurs so
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