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FMCS - DISPLAYS - CDS - FLIGHT MODE ANNUNCIATIONS
EFFECTIVITY
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FMCS - DISPLAYS - CDS - FLIGHT MODE ANNUNCIATIONS
EFFECTIVITY
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General
The thrust mode annunciation display shows the active N1 limit
mode calculated by the FMCS. The reference N1 bugs (2) show
the N1 limit for the active mode. The N1 limit mode controls the
N1 limit for autothrottle operation.
The reference N1 readouts may be set manually. They are set
with the N1 SET CONTROL inner knob. When the reference N1
readout is set manually, the N1 bugs show the N1 reference
readout value. These manually set limits have no effect on
autothrottle operation.
Thrust Mode Display
These thrust modes show on the engine display:
* TO (Takeoff)
* R-TO (Reduced takeoff)
* CLB (Climb)
* R-CLB (Reduced climb)
* CRZ (Cruise)
* CON (Continuous)
* GA (Go-around)
* - - - (no computed data from the FMCS).
Only one thrust mode can show and be active.
Display Control
When the N1 SET CONTROL outer knob is set to the AUTO
position, the thrust mode display and N1 bug position are set by
the FMCS as a function of DFCS mode logic. To override
automatic control, you can line select another mode from the N1
limit page. The displays go back to automatic control when the
DFCS pitch mode changes.
When the outer knob is set to the BOTH, 1 or 2 position, you can
manually set the reference N1 bugs and the N1 reference
readouts will be displayed above the digital N1 displays. With
the outer knob in the AUTO position, the readout is blank.
Non-Normal Operation
In automatic operation, the thrust mode display and reference
N1 bug readout are calculated by the FMCS. If the FMCS
calculations are not valid, the autothrottle limit message A/T
LIM shows. The autothrottle computer then calculates a single
N1 limit for both engines.
FMCS - DISPLAYS - CDS - THRUST MODE
EFFECTIVITY
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FMCS - DISPLAYS - CDS - THRUST MODE
EFFECTIVITY
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FMCS - DISPLAYS - CDS - THRUST MODE
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General
The takeoff and landing airspeed bugs show on the PFD speed
tape indication. The bugs are set automatically by the FMC or,
they can be set manually by the flight crew using the speed
reference selector on the engine control panel. When set
manually, the airspeeds show on the PFD speed tape indication
and a digital display of the set value shows.
You also use the speed reference selector to manually set the
airplane takeoff or landing gross weight. CDS will use this
weight value to calculate and display the flap maneuvering
speeds.
Speed Reference Selector
The outer control has these functions:
* AUTO (the FMCS supplies the reference airspeeds and
gross weight automatically)
* V1 (shows the takeoff decision speed on the ground and
shows INVALID ENTRY in-flight)
* VR (shows takeoff rotation speed on the ground and shows
INVALID ENTRY in-flight)
* WT (the pilot can set the gross weight manually)
* VREF (shows the landing reference speed (REF) in the air
and shows INVALID ENTRY on the ground)
* Triangle symbol (shows an airspeed bug the pilot can set)
* SET (the FMC and the inner control cannot move the
airspeed bugs).
The inner control sets the selected bug to the desired airspeed
or sets gross weight. The control is spring loaded to center.
Takeoff
This data shows on the PFD speed tape indication:
* Digital display (the display shows if the airspeed bug(s) or
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