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decrease the speed. This function only operates if the autopilot
is not engaged.
Mach Trim
The FCCs send mach trim signals to a mach trim actuator to
control the elevator movements. As the mach trim actuator
output shaft moves, it turns the feel and centering unit which
moves the input to the elevator PCUs. This moves the elevator.
The mach trim signal keeps the nose up at high air speeds. The
mach trim actuator also causes the elevator to be in a more
nose down position during takeoff which allows the pilots to
move the stabilizer to a more nose up position. This allows a
more nose up attitude if there is an engine failure during takeoff
and is called the FCC controlled neutral shift enable (FCNSE)
region.
Built-In-Test-Equipment (BITE)
The DFCS has interfaces with the FMCS to show the BITE
condition on the control display units (CDU). The BITE function
helps find failures.
DFCS - GENERAL DESCRIPTION
EFFECTIVITY
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DFCS - GENERAL DESCRIPTION
DFCS - GENERAL DESCRIPTION
EFFECTIVITY
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Flight Compartment
The mode control panel (MCP) is on the P7 glareshield.
The captain autopilot disengage switch is on the captain control
wheel. The first officer autopilot disengage switch is on the first
officer control wheel.
Flight Control Panel
The speed trim fail and mach trim fail annunciators have
interface with the digital flight control system (DFCS). They are
on the flight control panel.
Control Stand
The captain and first officer takeoff/go-around (TO/GA) switches
are on the thrust levers. The thrust levers are on the control
stand.
The autopilot (A/P) stab trim cutout switch has interface with the
DFCS. It is on the control stand.
DFCS - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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DFCS - FLIGHT COMPARTMENT COMPONENT LOCATION
DFCS - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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Instrument Panel
The stab out of trim annunciator has interface with the DFCS.
The stab out of trim annunciator and the captain autoflight
status annunciator (ASA) are on the P1-3 panel. The first officer
ASA is on the P3-1 panel.
DFCS - INSTRUMENT PANEL COMPONENT LOCATIONS
EFFECTIVITY
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DFCS - INSTRUMENT PANEL COMPONENT LOCATIONS
DFCS - INSTRUMENT PANEL COMPONENT LOCATIONS
EFFECTIVITY
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E-1 Rack
The integrated flight system accessory unit (IFSAU) is on the E1-
1 shelf. The flight control computer (FCC) A is also on the E1-1
shelf. The FCC B is on the E1-4 shelf. The program switch
modules for FCC A and FCC B are also on the E1 rack.
DFCS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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DFCS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATION
DFCS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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Tailcone Component Locations
The autopilot elevator actuators are on the left side of the
forward bulkhead of the tail cone.
The elevator position sensor is on the lower right side of the
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