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时间:2010-05-02 22:39来源:蓝天飞行翻译 作者:admin
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22-11-00-046
General
There are two A/P disengage switches. One is on the outboard
side of the captain control wheel. The other is on the outboard
side of the first officer control wheel. The two switches can
disengage both FCCs and turn off both ASAs.
Each switch is a momentary pushbutton switch. Each switch has
three normally-closed contacts and one normally-open contact.
DFCS - AUTOPILOT DISENGAGE SWITCH
EFFECTIVITY
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DFCS - AUTOPILOT DISENGAGE SWITCH
DFCS - AUTOPILOT DISENGAGE SWITCH
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DFCS - AUTOPILOT DISENGAGE SWITCH
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the autopilot (A/P) functions of the flight control
computer (FCC):
* A/P roll control
* A/P pitch control
* Autoland
* Engage interlocks
* Warning and annunciations
* Stabilizer trim.
The autopilot can control the airplane two ways. In the
command (CMD) mode, it controls the airplane automatically
with no control column inputs from the pilots. In the control
wheel steering (CWS) mode, it controls the airplane using
control column inputs from the pilots.
Changes between A/P modes do not supply unwanted
movement. Changes between the A/P and flight director (F/D)
modes do not supply unwanted movement or F/D commands.
A/P Names
The A/P may be called one of these names:
* Channel A or channel B.
* Local (LCL) or foreign (FGN)
* Master or slave.
The A/P channel A is the A/P from FCC A and the A/P channel B
is from FCC B.
For A/P channel A, the LCL A/P is FCC A and the FGN A/P is
FCC B. For A/P channel B, the LCL A/P is FCC B and the FGN A/
P is FCC A.
When the crew engages one A/P, that A/P is the master and the
other A/P is the slave. When the crew engages both A/Ps (dual
mode), the first A/P engaged is the master and the second
engaged is the slave. The master A/P controls the mode
displays on the flight mode annunciator (FMA) and the data that
goes to the A/T and FMCS.
A/P Roll Control
The roll control function uses data from several airplane
sensors and the roll CWS force transducer to calculate a roll
command. The roll command goes to the aileron A/P actuators
to move the control surfaces through the aileron PCUs. The
FCCs use feedback signals from these sensors to calculate the
roll commands:
* Aileron position sensor
* Spoiler position sensors
* Flap position transmitter
* Aileron A/P actuator position sensors.
DFCS - FUNCTIONAL DESCRIPTION - AUTOPILOT CONTROLS
EFFECTIVITY
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A/P Pitch Control
The pitch control functions use data from several airplane
sensors and the pitch CWS force transducers to calculate a
pitch command. The pitch command goes to the elevator A/P
actuators to move the control surfaces through the elevator
power control units (PCU). The FCCs use feedback signals from
these sensors to calculate the pitch commands:
* Elevator position sensor
* Elevator neutral shift sensor
* Stabilizer position sensors
* Flap position transmitter
* Elevator A/P actuator position sensors.
Autoland
The autoland function consists of these parts of the flight path:
* Approach
* Flare
* Go-around.
The autoland function will only operate if both FCC A and FCC B
are engaged. The autoland function contains both pitch and roll
commands.
Engage Interlocks
The autopilot engage interlock circuits monitor these functions:
* Power
* Operation
* Components.
With normal conditions, the circuits let the autopilot engage. If
conditions are not normal, the autopilot disengages or the
autopilot will not engage.
Warning and Annunciations
The warning and annunciation function sends normal and nonnormal
indications of the autopilot performance to these
 
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