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DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL CONTROL
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL CONTROL
DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL CONTROL
EFFECTIVITY
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DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL CONTROL
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The FCC control laws calculate the elevator commands that go
to the elevator autopilot actuators for the pitch modes. They also
calculate the F/D commands that go to the DEUs. There are
cruise pitch modes and takeoff/approach pitch modes
The FCCs calculate the pitch commands for these cruise pitch
modes:
* Vertical navigation (VNAV)
* Altitude acquire (ALT ACQ)
* Altitude hold (ALT HOLD)
* Vertical speed (V/S)
* Level change (LVL CHG).
The crew can also engage the A/P in pitch CWS.
VNAV
The FCC uses these inputs to calculate the VNAV speed (VNAV
SPD) and VNAV path (VNAV PTH) pitch commands:
* MCP VNAV mode selector pushed
* FMC target altitude
* FMC target V/S
* FMC target airspeed
* FMC target mach
* FMC discretes
* MCP selected altitude.
ALT ACQ
The FCC automatically selects the altitude acquire mode when
the airplane approaches the MCP selected altitude. There are
no mode selector switches to select this mode.
The FCC uses these inputs to calculate the altitude acquire pitch
commands:
* MCP selected altitude
* Baro corrected altitude
* True airspeed
* Inertial vertical speed
* Inertial altitude
* Uncorrected altitude.
ALT HOLD
You can select the altitude hold mode with the ALT HLD
pushbutton. The FCC selects the altitude hold mode
automatically when the airplane reaches the MCP selected
altitude.
The FCC uses these inputs to calculate the altitude hold pitch
commands:
* MCP ALT HLD mode selector pushed
* Speed and altitude reference from the altitude acquire mode
* Uncorrected baro altitude
* True airspeed
* Inertial vertical speed
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH CRUISE CONTROL
EFFECTIVITY
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* Inertial altitude.
Vertical Speed
The FCC uses these inputs to calculate the vertical speed pitch
commands:
* MCP V/S mode selector pushed
* Inertial vertical speed
* True airspeed
* MCP selected V/S.
LVL CHG
In the level change mode, the A/P uses the elevator to control
the airplane speed. The FCC uses these inputs to calculate the
level change pitch commands:
* MCP LVL CHG mode selector pushed
* MCP selected altitude
* MCP selected speed
* Longitudinal acceleration
* True airspeed
* Airplane pitch attitude
* Flap angle
* Angle of airflow
* Inertial V/S and acceleration
* calibrated airspeed.
Pitch CWS
The FCC uses these inputs to calculate the CWS pitch
command.
* Captain pitch CWS force transducer
* First officer pitch CWS force transducer
* Computed airspeed
* Uncorrected baro altitude.
Autopilot Elevator Commands
The FCC can use the pitch commands from all the cruise modes
to calculate the autopilot elevator command. The FCC also
applies pitch limits to the aileron commands. The FCC also uses
these signals to calculate the elevator command:
* Airplane pitch attitude
* Airplane pitch rate
* Pitch A/P elevator actuator position
* Elevator Position
* Neutral shift sensor position
* A/P roll command.
Flight Director Pitch Commands
The FCC can use the pitch command from all the cruise modes
except the pitch CWS mode to calculate the F/D commands. The
FCC also applies pitch limits to the F/D commands. The FCC
also uses the airplane pitch attitude to calculate the F/D
commands.
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH CRUISE CONTROL
EFFECTIVITY
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