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Column Switching Module
The column switching module sends signals to the FCCs to
show when the control column moves to the forward or aft
position. If the control column moves opposite of the stab trim
command, the column switching module will stop the trim
signal. The column switching module sends a clutch engage
signal through the A/P cruise trim cutout switch to the stabilizer
trim actuator. It also sends the trim up and trim down drive
signals to the stab trim cutout relay. These signals then go
through the stab nose limit switches to the stabilizer trim
actuator.
Flight Control Panel
The flight control panel receives a speed trim warning signal
from each FCC. Both FCCs must send a fail signal to turn on the
speed trim fail annunciator.
Recall signals from the master caution annunciators and reset
signals from the master caution lights go to the flight control
panel. These signals turn on the speed trim fail light if only one
FCC speed trim fails.
DFCS - SPEED AND STAB TRIM ANALOG INTERFACE
EFFECTIVITY
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Left Elevator Tab Solenoid Valve
When the flaps are one unit or more (FLAPS DN) and the
hydraulics are on, the elevator tabs move in the same direction
as the elevator. This gives an increase in the elevator
performance for an engine-out takeoff condition. The FCCs
supply the FLAPS DN signal to the left elevator tab solenoid
valve.
Stabilizer Trim Electric Actuator
The stabilizer trim electric actuator sends a signal to the FCCs
that tells if the actuator is in the low or high speed. The position
of the flaps cause the speed of the actuator to change.
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EFFECTIVITY
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DFCS - SPEED AND STAB TRIM ANALOG INTERFACE
DFCS - SPEED AND STAB TRIM ANALOG INTERFACE
EFFECTIVITY
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General
The mach trim function of the FCC interfaces with these
components:
* Mach trim actuator
* Integrated flight system accessory unit (IFSAU)
* Flight control panel.
Power
The 115v ac transfer bus 1 and 28v dc bus 1 send mach trim
power to FCC A. The 115v ac transfer bus 2 and 28v dc bus 2
send mach trim power to FCC B. The 28v dc bus 2 also sends
power to the IFSAU.
Mach Trim Actuator
The mach trim actuator sends the mach trim position signal to
the FCCs.
IFSAU
Only one FCC can control the mach trim actuator at a time. The
IFSAU receives the FCC select signal from FCC B. This signal
controls a relay in the IFSAU to find which FCC will give the
mach trim actuator signals. The IFSAU sends the mach trim
select status signal to the FCCs to show which FCC is in control.
The IFSAU then sends mach trim power and motor drive signals
to the mach trim actuator.
Flight Control Panel
The flight control panel receives a mach trim warning signal
from each FCC. Both FCCs must send a fail signal to turn on the
mach trim fail annunciator.
Recall signals from the master caution annunciators and reset
signals from the master caution lights go to the flight control
panel. These signals can turn on the mach trim fail light if only
one FCC mach trim fails.
FCC
The FCCs send mach trim power and motor drive signals to the
IFSAU. FCC B sends a signal to the IFSAU to set which FCC will
supply mach trim data to the mach trim actuator. Each time the
airplane lands, the FCCs switch control of the mach trim
actuator.
DFCS - MACH TRIM ANALOG INTERFACE
EFFECTIVITY
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DFCS - MACH TRIM ANALOG INTERFACE
DFCS - MACH TRIM ANALOG INTERFACE
EFFECTIVITY
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