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components:
* Captain autoflight status annunciator (ASA)
* First Officer ASA
* Display electronics unit (DEU)
* Flight control panel
* MCP IAS/MACH indicator
* Stab out of trim light.
Stabilizer Trim
When the autopilot is engaged, it sends trim commands to the
stabilizer. The stabilizer trim system uses the same stab trim
electric actuator that the speed trim system uses.
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General
The FCC calculates the aileron commands for the roll modes
that go to the aileron autopilot actuators. They also calculate the
flight director (F/D) commands that go to the DEUs.
The FCCs calculate the roll commands for these roll modes:
* Lateral navigation (LNAV)
* Heading select (HDG SEL)
* Very high frequency omni range (VOR)
* Localizer (LOC)
* Go-around (G/A)
* Takeoff (T/O).
The crew can also engage the A/P in roll control wheel steering
(CWS).
LNAV
In the LNAV mode, the roll command is the LNAV steering
command that the FCC gets from the FMC.
HDG SEL
The FCC uses these inputs to calculate the heading select roll
command:
* MCP HDG SEL mode selector pushed
* MCP selected heading
* Airplane magnetic heading
* True airspeed
* MCP bank angle limit.
VOR
These are the three submodes of the VOR mode:
* VOR capture
* VOR on-course
* VOR over-station.
The FCC uses these inputs to calculate the VOR roll commands
for the three submodes:
* MCP VOR/LOC mode selector pushed
* MCP selected course
* Airplane magnetic track
* VOR omnibearing
* DME distance
* True airspeed
* MCP bank angle limit
* Airplane roll attitude
* Uncorrected altitude.
LOC
These are the three submodes of the LOC mode:
* LOC arm
* LOC capture
* LOC on-course.
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The FCC uses these inputs to calculate the LOC roll commands
for the three submodes:
* MCP VOR/LOC mode selector pushed
* MCP selected runway heading
* Airplane magnetic track
* Lateral acceleration
* Airplane roll attitude
* Localizer deviation
* Radio altitude
* Glideslope (G/S) engaged.
Roll G/A
The FCC uses the airplane magnetic track to calculate the roll
G/A command.
Roll T/O
The FCC uses these inputs to calculate the roll T/O command:
* MCP selected heading
* Airplane magnetic heading.
Roll CWS
The attitude hold and the heading hold are two submodes of the
roll CWS mode. The FCC uses these inputs to calculate the CWS
roll commands for the submodes:
* Roll CWS force transducer
* Airplane magnetic heading
* True airspeed
* Airplane roll attitude
* Airplane roll rate.
Autopilot Aileron Commands
The FCC can use the roll commands from all the modes except
the roll T/O mode to calculate the autopilot aileron command.
The FCC also applies roll limits to the aileron commands. The
FCC also uses these signals to calculate the aileron command:
* Airplane roll attitude
* Airplane roll rate
* Roll A/P aileron actuator position
* Aileron Position.
The FCC uses the roll command to calculate the pitch
commands to increase the pitch as the airplane rolls.
Flight Director Roll Commands
The FCC can use the roll command from all the modes except
the roll CWS mode to calculate the F/D commands. The FCC
also applies roll limits to the F/D commands. The FCC also uses
the airplane roll attitude and roll rate to calculate the F/D
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