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minimal winds are present to allow track mode corrections.
Vertical speed is used in determining windshear.
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EFFECTIVITY
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General
The A/T computer sends digital data to system components and
sensors. The A/T computer sends this data on two digital buses
to the user components.
A/T Digital Outputs
A/T bus 1 connects to these components:
* FCC A and B
* DEU 1 and 2
* FMCs
* FDAU.
The A/T sends these parameters on bus 1:
* A/T fast/slow command
* BITE response
* A/T modes and status
* Thrust rate command
* ASM measured torque
* ASM measured rate.
A/T bus 2 connects to ASM 1 and ASM 2. The A/T sends these
parameters on this bus:
* Thrust rate command
* TRA selection
* TRA max limit.
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General
The A/T computer does the calculations for automatic control of
engine thrust. The A/T computer sends the commands to the
autothrottle servo motors to move the thrust levers.
Physical Description
The A/T computer is 3 MCU in size and weighs about 11
pounds. An electrical connector at the back of the computer
supplies the interface to other aircraft components.
The A/T computer has two circuit breakers on the front. These
circuit breakers are ASM 1 and ASM 2. Power for the
autothrottle servo motors comes from these circuit breakers.
Operation
The pilot uses the A/T system during these flight phases:
* Takeoff
* Climb
* Cruise
* Descent
* Approach to landing
* Go-around.
The A/T computer continuously monitors the system operation.
If it finds a fault, the A/T computer records this fault in its
memory.
The A/T computer uses an operational and a built-in test (BITE)
program. These programs are in the computer’s memory.
During the operational program test, the computer uses the
sensor and system inputs to make the thrust rate commands.
Training Information Point
A built-in test (BITE) program monitors the system operation.
The A/T computer records faults and the suspect component(s)
in memory. The technician uses A/T BITE on the FMCS control
display units (CDUs) to look at these recorded faults. The
technician also uses A/T BITE to check system operation.
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EFFECTIVITY
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General
The autothrottle computer is a digital computer. It takes inputs
from many systems to calculate the thrust lever commands. The
A/T computer has these components:
* Direct memory access (DMA)
* Central processing unit (CPU)
* Read only memory (ROM)
* Power supply.
DMA System
The DMA system has these components:
* Input/output (I/O) devices
* Controller
* Random access memory (RAM).
The A/T computer receives and sends digital and analog
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