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* Flap and gear placard speeds
* Maximum operating velocity and mach (VMO/MMO)
* Alpha floor minimum speed.
With the LVL CHG mode active, the LEDs on the LVL CHG mode
selector switch are on. MCP SPD shows on the FMA in green
letters.
Altitude Capture
When the airplane is at the altitude set on the MCP, the DFCS
pitch mode changes to ALT ACQ and then to ALT HOLD.
Reversion Modes
The DFCS automatically switches to the LVL CHG mode if any of
these conditions occur:
* When in V/S or VNAV and the speed decreases to within 1.3
times the stall speed
* When in V/S or VNAV and the A/T is disengaged or engaged
at aft stop and the speed approaches VMO/MMO
DFCS - OPERATION - LEVEL CHANGE
EFFECTIVITY
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* When in V/S and the airplane cannot get to the MCP selected
speed.
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DFCS - OPERATION - LEVEL CHANGE
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EFFECTIVITY
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General
In pitch control wheel steering (CWS), the pilot controls the
airplane as if the A/P is disengaged. The control of the airplane
is from two CWS force transducers and through the FCC. The
pitch CWS mode has an attitude hold and an out-of-detent (O/D)
submode.
These are the three ways to engage the pitch CWS mode:
* Push the CWS A/P engage switch
* Push the CMD A/P engage switch and do not select a pitch
mode
* When a pitch CMD mode is active, apply a column force of
more than 21 pounds, hi detent.
The FMA annunciation is the amber CWS P in the DFCS status
column.
The force on the control column, while in pitch CWS, is one of
these three levels:
* In-detent, less than 5.0 pounds
* Low detent, more than in-detent level but 21 pounds or less
* Hi detent, more than 21 pounds of force.
Attitude Hold Submode
When you engage the CWS mode, the A/P goes to the attitude
hold submode. In this submode, the A/P holds the airplane pitch
atitude to the pitch attitude at the time the A/P enters the CWS
mode.
Pitch CWS O/D
When the control column force is out-of-detent, low or hi detent,
the pilot controls the airplane pitch attitude. The captain and first
officer pitch CWS force transducers send a signal to the FCC.
The FCC averages the two signals and the FCC sends a control
signal to the A/P actuators.
When the control column force goes back to in-detent, the A/P
goes to the attitude hold submode.
If the A/P is in another pitch CMD mode, such as V/S, and the
control column is in hi detent, the A/P goes to the pitch CWS
mode. This can occur if the A/P is in the single approach mode,
but not in the dual A/P approach mode.
If the A/P was in the ALT HOLD or the ALT ACQ mode, the force
on the control column must remain until the airplane is more
than 250 feet from the MCP altitude. If not, the A/P will return to
the ALT HOLD or ALT ACQ mode and stay in CMD.
DFCS - OPERATION - PITCH CWS
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General
You can push the VOR LOC mode selector switch to select a
VOR or LOC roll approach mode for landing. If the frequency set
in the navigation control panel is a VOR frequency, the VOR roll
approach mode is selected. If the frequency set in the
navigation control panel is an ILS frequency, the LOC roll
approach mode is selected.
You can also engage the A/P in CWS and use the roll CWS for
A/P only commands for an approach.
VOR Approach Mode
You can select a VOR approach to the runway. The VOR
　
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