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to the ARM mode.
The A/T goes into reduced thrust go-around (GA mode) when
you push a TO/GA switch once during the approach. The A/T
commands the thrust levers to an internally calculated thrust to
achieve a reduced thrust go-around. During go-around when
you push a TO/GA switch a second time, the A/T goes into N1
mode and commands the T/ls to set thrust to the FMC N1 limit
for go-around.
TEST displays when you enter A/T BITE from the FMC CDU.
A/T SYSTEM - OPERATION - FMA
EFFECTIVITY
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When there is a mode change, a box shows around the A/T
mode on the FMA display for 10 seconds.
A/T SYSTEM - OPERATION - FMA
EFFECTIVITY
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22-31-00-017
A/T SYSTEM - OPERATION - FMA
A/T SYSTEM - OPERATION - FMA
EFFECTIVITY
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22-31-00-017
General
The upper engine display shows these thrust annunciations that
are calculated by the FMC:
* Thrust mode annunciation (TMA)
* Reference N1 cursors on the N1 dials.
Normal Operation
During normal operation, the FMC calculates the engine thrust
N1 limits. The FMC sends these to the DEUs to show the
reference N1 cursors on the N1 dials on the engine display.
During normal operation, the reference N1 displays above the
actual N1 box are blank.
The FMC also calculates the thrust modes for each flight phase
and sends them to the DEU to show on the TMA at the top of the
engine display.
See the flight management computer system section for more
information about the thrust mode displays. (SECTION 34-61)
Non-Normal Operation
During non-normal operation when FMC N1 data is invalid or no
computed data (NCD), three dashes show on the TMA in place
of the FMC thrust modes. The reference N1 displays above the
actual N1 box show dashes to show that the reference N1
cursors on the N1 dials are not set by the FMC.
When FMC N1 data is invalid, you can use the N1 set selector on
the engine control panel to manually set the reference N1
cursors on the N1 dials. This sets the N1 cursors and shows the
selected reference N1 readout digitally above the actual N1 box.
The manually set N1 data is for reference only and does not go
to any airplane user system.
When FMC N1 data is invalid or NCD, the A/T computer
calculates a single N1 limit for both engines. The message A/T
LIM shows on the engine display. In this mode, the A/T
computer calculates an engine N1 limit for climb, cruise, and
go-around, but not for takeoff.
A/T SYSTEM - ENGINE DISPLAY
EFFECTIVITY
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