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TRA data is sent from the TR packs to the EECs to set engine
thrust.
Speed
In the speed mode, the A/T uses these inputs:
* Target airspeed
* Target mach
* Computed airspeed
* Mach
* True airspeed
* Longitudinal acceleration
* Minimum operating speed (from SMYD).
In the speed mode, the A/T controls thrust to a target airspeed.
The target speed can be either the MCP speed which is the
speed selected by the pilot or FMC speed if in DFCS VNAV
mode. The A/T compares the target airspeed with the actual
airplane speed from the ADIRUs, either CAS or Mach. A
difference between the actual and target speed causes a T/L
rate command to set thrust.
The A/T compares the minimum operating speed from the
SMYD and the computed airspeed from the ADIRU to set a
minimum speed floor. The A/T will not allow the speed to go
less than the speed floor.
Retard
There are two A/T retard modes, descent RETARD and flare
RETARD. They annunciate as RETARD on the FMA.
For descent retard from cruise flight, at FMC top of descent
(TOD) the A/T commands the T/Ls to reduce engine thrust to
idle. In descent RETARD, the thrust levers move to the aft stops
at 1 deg/sec.
Flare RETARD is used during landing flare. For flare retard, the
A/T uses these inputs:
A/T SYSTEM - FUNCTIONAL DESCRIPTION - COMMAND CALCULATION
EFFECTIVITY
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* Speed mode selection
* Flap position
* Radio altitude
* A/P flare.
The A/T goes into the flare retard mode during landing if on G/S
and in MCP SPD mode. The A/T commands the T/Ls to move to
the aft stops at 3 deg/sec. After landing, the T/Ls move to the
idle stop at 8 deg/sec. During the flare retard mode, the T/Ls get
to idle within 6 seconds.
Go-Around
In the go-around mode, the A/T uses these inputs:
* N1 mode
* Speed mode
* TO/GA switch input
* Radio altitude
* Gross weight
* Flap position.
There are two A/T go-around modes, GA and N1. For reduced
thrust go-around the A/T uses an internally calculated thrust
value to achieve an eight percent climb gradient. For max thrust
go-around, the A/T uses FMC N1 targets and EEC TRA targets
to set thrust.
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A/T SYSTEM - FUNCTIONAL DESCRIPTION - COMMAND CALCULATION
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EFFECTIVITY
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General
A/T modes of operation show on the flight mode annunciation
(FMA) at the top of the primary flight display above the ADI.
A/T Modes
The FMA shows these A/T modes:
* ARM
* N1
* THR HLD
* FMC SPD
* MCP SPD
* RETARD
* GA
* TEST.
ARM shows when the A/T system is enabled and is ready to
receive commands but no active modes are selected.
N1 shows when the A/T system controls engine thrust to the
FMC calculated N1 target during takeoff, climb, or max thrust
go-around.
THR HLD shows during takeoff at more than 84 knots. In the
throttle hold mode, the A/T removes power from the ASMs. The
T/Ls stay at the thrust set for takeoff. When the airplane gains a
barometric altitude of 800 feet AGL and ten seconds after liftoff,
the A/T restores power to the ASMs and changes to the ARM
mode. Above 800 feet, you can select either N1 or speed mode
during climb out.
FMC SPD shows when the A/T controls thrust to hold the FMC
target speed during DFCS VNAV pitch mode.
MCP SPD shows when the A/T controls thrust to hold the
airplane speed you select on the MCP.
RETARD shows when the A/T moves the thrust levers to the idle
stop. This can be either descent retard or flare retard. During
descent retard, after the T/Ls reach the idle stops the A/T goes
　
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