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A/T SYSTEM - A/T SERVO MOTOR
22-31-00
Page 34
D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The autothrottle servo motor (ASM) receives digital, analog
discrete inputs, and power from the A/T computer. The ASM
uses these inputs to control a motor which moves the thrust
levers.
The ASM has these components:
* ARINC 429 receiver and transmitter
* Control unit
* Motor
* Power supply.
ARINC 429 Receiver
The A/T sends these signals to the ARINC 429 receiver:
* Thrust rate command
* Thrust resolver angle (TRA) selection
* TRA maximum limit.
The ARINC 429 receiver changes these signals to the proper
format then sends them to the control unit.
ARINC 429 Transmitter
The ARINC 429 transmitter changes the control unit data to the
proper format, and sends these signals to the A/T:
* Measured rate
* Measured torque
* Servo status.
Control Unit
The control unit receives these inputs:
* Installation programing pins
* Logic power
* Data from the digital receiver
* Rate feedback from the motor.
Using these inputs, the control unit does these:
* Decides when to send the motor rate command
* Controls how fast and what direction the motor turns
* Limits the thrust lever angle below the maximum
* Decides the installation position (right or left).
Motor
The motor is a reversible DC stepper motor. It receives motor
power from the A/T when the A/T is engaged. It also receives
rate command from the control unit to control the motor
rotation.
The motor sends rate feedback to the control unit. The motor
has an output shaft which connects to a gearbox. The gearbox
sets the thrust lever and the thrust lever angle resolver to the
desired position.
A/T SYSTEM - A/T SERVO MOTOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 22-31-00
Page 35
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-012
Power Supply
The power supply gets 28v dc from the A/T computer. It supplies
the necessary power to the control unit.
A/T SYSTEM - A/T SERVO MOTOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 22-31-00
Page 36
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-012
A/T SYSTEM - A/T SERVO MOTOR - FUNCTIONAL DESCRIPTION
A/T SYSTEM - A/T SERVO MOTOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 22-31-00
Page 37
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-012
General
Switches on the mode control panel (MCP) and the thrust levers
select or disconnect the A/T modes.
MCP A/T Arm Switch
The A/T arm switch is on the MCP. The A/T arm switch engages
the A/T system.
When you put the switch in the arm position, the green A/T arm
light comes on. An engage solenoid holds the switch in the arm
position if conditions are valid. The switch goes to OFF
automatically if the A/T senses a problem.
You can also manually disengage the A/T when you put the A/T
arm switch to OFF.
MCP A/T Mode Select Switches
The MCP has these A/T mode select switches:
* N1
* Speed.
These mode select switches are lighted. In normal operation,
the DFCS automatically chooses the mode. The DFCS turns on
the mode selector switch light when that mode is chosen. When
a switch light is on, you can cancel that the mode by a push of
the switch.
When the autopilot and flight director are off, push on the
desired mode select switch to select an A/T mode. Push the
active switch to turn off the mode.
Thrust Lever Switches
These switches are on the left and right thrust levers:
* TO/GA switches
* A/T disconnect switches.
Push the TO/GA switch to engage the DFCS and the autothrottle
to either the takeoff or go-around mode. On the ground, both
systems will go to the takeoff mode when you push the switch.
During takeoff, the A/T system causes the engine thrust to
increase to the takeoff (TO) N1 .
When you push the TO/GA switch during approach, the A/T
system increases engine thrusts to a go-around (GA) thrust
mode setting. This level of thrust is less than the maximum GA
thrust. The engine thrust increases to the full GA thrust limit
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