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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-052
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH CRUISE CONTROL
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH CRUISE CONTROL
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The pitch takeoff/approach mode consists of the approach/goaround
(G/A) mode and the takeoff (T/O) mode. The T/O mode
is a flight director mode only.
Approach/Go-Around Mode
The pitch approach/go-around mode has these submodes:
* G/S capture
* G/S track
* Approach-on-course
* Flare
* Go-around.
The FCC uses these inputs to calculate the approach/go-around
pitch command:
* MCP APP mode selector pushed
* Inertial vertical speed and acceleration
* Airplane pitch attitude and pitch rate
* Longitudinal acceleration
* Flight path acceleration
* G/S deviation
* Radio altitude
* True and computed airspeed
* Nav receiver tuned to LOC frequency
* Stabilizer position and trim
* Flap angle
* A/P pitch actuator position
* Engine N1
* Angle of airflow
* Wheel speed
* TO/GA switch
* ground speed
* squat switch.
Takeoff Mode
The FCC calculates the takeoff mode commands with same
inputs as the approach/go-around mode.
Autopilot Elevator Command
The FCC uses the pitch commands from the approach/goaround
mode to calculate the autopilot elevator command. The
FCC also applies pitch limits to the aileron command. The FCC
also uses these signals to calculate the elevator command:
* Pitch A/P elevator actuator position
* Elevator Position
* Neutral shift sensor position
* Airplane pitch attitude
* Airplane pitch rate
* A/P roll command.
Flight Director Pitch Command
The FCC can use the pitch command from both modes to
calculate the F/D command. The FCC also applies pitch limits to
the F/D command. The FCC also uses the airplane pitch attitude
to calculate the F/D command.
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH APPROACH CONTROL
EFFECTIVITY
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Page 98.44
D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-053
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH APPROACH CONTROL
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH APPROACH CONTROL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-053
General
The autoland function is the dual channel (FCC A and FCC B)
operation of the digital flight control system (DFCS). To make an
autoland approach, you use the autoland function. The autoland
function consists of these operations:
* Synchronization
* Initialization
* Equalization
* Monitors
These functions are necessary to engage the autoland function.
Synchronization
When each FCC is engaged in the autopilot command mode
(CMD) or CWS, the A/P actuators for that FCC synchronize their
outputs to the control surface position. This occurs before the
FCC energizes the detent solenoids. This prevents a sudden
movement of the control surfaces when the actuator detent
piston clamps onto the output shaft.
Initialization
The CPU 1 and CPU 2 in the FCC that is engaged first calculate
the control laws. At initialization, the first FCC transfers the
control law data to the CPUs in the second FCC. The first FCC
also transfers the data between its own CPUs. FCC A and FCC B
have the same data so they should agree on the pitch and roll
commands.
Equalization
The FCCs compare the two elevator A/P actuator output
positions and make them the same if there is a difference.
This also occurs for the aileron A/P actuators. This makes sure
that the actuators agree with each other.
Monitors
These are the three monitor circuits that monitor the
performance of the two FCC autopilots:
* Surface position monitor
* A/P actuator position monitor
* CPU command monitor.
The surface position monitor compares the position of the A/P
actuator and the control surface.
The A/P actuator position monitor compares the position of the
　
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