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when you push the TO/GA switch a second time.
Push an A/T disconnect switch to disengage the autothrottle
system. The ASA A/T red warning light flashes and the MCP A/T
arm switch goes to OFF. Push an A/T disconnect switch a
second time to reset the A/T warning.
A/T SYSTEM - ARM, MODE SELECT, AND THRUST LEVER SWITCHES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-013
A/T SYSTEM - ARM, MODE SELECT, AND THRUST LEVER SWITCHES
A/T SYSTEM - ARM, MODE SELECT, AND THRUST LEVER SWITCHES
EFFECTIVITY
SHZ ALL 22-31-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-013
THIS PAGE IS INTENTIONALLY LEFT BLANK
A/T SYSTEM - ARM, MODE SELECT, AND THRUST LEVER SWITCHES
22-31-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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 A/T computer does checks of the sensors and A/T system
performance. Input data comes in on data buses to the A/T
computer. If the system operation and sensors are normal, the
engage logic lets the A/T engage.
The A/T system uses a hardware and a software monitor. If
these monitors finds a problem, the system disengages. The
engage logic disengages the A/T if one of these conditions
occur:
* An invalid sensor or A/T system condition
* Airplane on the ground after the flight is complete
* Disengage signal from a disengage switch.
When the A/T disengages, a warning circuit starts the A/T
flashing warning lights on the ASAs.
Hardware Monitor
The hardware monitor looks at the CPU cycle time and the
thrust resolver angles (TRAs). If it senses a problem, it
disengages the A/T.
The hardware monitor compares the TRAs for a thrust lever
split condition. If both autopilots are in autoland and the A/T
rapidly commands a difference of 10 degrees between the two
thrust levers, the A/T disengages. This 10 degree difference is
from the steady state thrust lever split value. The A/T permits a
steady state split angle to let you operate with engine intermix.
Software Monitor
The software monitor uses software logic to permit system
engagement. The software monitor does checks for these
conditions:
* Normal operation of programmable read only memory
(PROM), CPU, RAM, and timing
* Normal thrust lever positions with no thrust lever split in
autoland and in cruise
* Invalid sensor conditions for the active mode
* Landing condition.
The software monitor disconnects the A/T if it senses a problem
with the A/T, thrust lever split, or with the sensors. It also
automatically disconnects the A/T when the airplane makes a
landing.
The software monitor does a check of the TRAs and engine
thrust from the EEC for thrust lever split. A rapid A/T command
which produces a 10 degree difference between the two thrust
levers disengages the A/T. While in cruise, engine thrust
differential of 2,000 pounds also disconnects the A/T.
A/T SYSTEM - FUNCTIONAL DESCRIPTION - ENGAGE LOGIC
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-014
A/T Warning
The red A/T warning lights on the ASAs come on when the A/T
disconnects or when the A/T is in BITE. The A/T warning flashes
if the A/T disconnects and is steady while in BITE.
The A/T warning flasher latches on when the A/T disconnects.
The flasher resets when you do one of these:
* Re-engage the A/T
* Push a disengage switch
* Push an A/T warning light.
SHZ ALL; AIRPLANES WITHOUT FCC COLLINS SOFTWARE P/
N 831-5854-140
The flasher does come on when the autothrottle disenages
automatically during landing.
SHZ ALL
ASM Motor Power
The A/T sends 28v dc to the autothrottle servo motors if all these
conditions are true:
* Not in throttle hold
* Not in cutout (disengage switch not pressed)
* A/T is engaged.
A/T SYSTEM - FUNCTIONAL DESCRIPTION - ENGAGE LOGIC
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-014
　
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