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A/T. During takeoff and max thrust go-around, the A/T uses EEC
TRA targets and FMC N1 targets to set thrust.
During takeoff, climb, and max thrust go-around, the FMC N1
targets are the same as the N1 limits. During reduced thrust
climb and cruise operations, the FMC N1 targets are less than
the N1 limits.
The FMC calculates gross weight and sends it to the A/T to use
in calculation of thrust and T/L rate commands.
The FMC has an interface for A/T for BITE.
FCC
The FCCs send mode request discretes to the A/T to select A/T
modes consistent with the active DFCS mode. The A/T sends
mode status to the FCC.
ADIRU
The ADIRUs send this data to the A/T:
* True airspeed
* Mach
* Barometric altitude
* Atmospheric pressure
* Static outside air temperature
* Inertial vertical speed
* Acceleration.
The A/T uses ADIRU data when calculating T/L rate commands
to set engine thrust for precise thrust adjustments during
changing flight conditions.
A/T SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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EEC
The DEUs send FMC N1 targets to the EECs. The EECs use the
data to calculate equivalent TRA targets. The A/T uses the EEC
TRA targets to set thrust during takeoff, climb, and max thrust
go-around. For takeoff and max thrust go-around, the A/T
initially uses EEC TRA targets to advance the T/Ls. As the T/Ls
get to within 4 to 6 degrees of the FMC N1 limit, the A/T then
uses FMC N1 targets to make final T/L adjustments to the FMC
N1 limit.
A/T SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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A/T SYSTEM - GENERAL DESCRIPTION
A/T SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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Electronic Equipment (E/E) Compartment
The autothrottle computer is on the E1-1 shelf.
The autothrottle program switch module is on the left side of the
E1-1 shelf.
The A/T computer is an ARINC 600 3MCU size and weighs 9 lbs.
A/T SYSTEM - ELECTRONIC EQUIPMENT COMPARTMENT LOCATION
EFFECTIVITY
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A/T SYSTEM - ELECTRONIC EQUIPMENT COMPARTMENT LOCATION
A/T SYSTEM - ELECTRONIC EQUIPMENT COMPARTMENT LOCATION
EFFECTIVITY
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Flight Compartment
These components in the flight compartment have interface
with the A/T system:
* DFCS mode control panel (MCP)
* Thrust lever TO/GA switches
* Thrust lever disconnect switches
* Autoflight status annunciators (ASAs)
* Outboard flight displays and center display unit.
The A/T Arm switch and light, and the two A/T mode selector
switches are on the MCP on the glareshield.
The A/T disconnect switches and TO/GA switches are on the
thrust levers.
A/T SYSTEM - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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A/T SYSTEM - FLIGHT COMPARTMENT COMPONENT LOCATION
A/T SYSTEM - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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Forward Equipment Compartment
The A/T servo motors (ASMs) are in the forward equipment
compartment under the P10 control stand.
The servo motors connect to the thrust levers (T/Ls) through the
gearbox, the thrust resolver (TRs) packs, and mechanical
linkages below the control stand.
A/T SYSTEM - FORWARD EQUIPMENT COMPARTMENT LOCATION
EFFECTIVITY
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