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the ALT ACQ mode, the V/S mode selector switch LEDs go out.
Change the MCP Selected Altitude
If the crew changes the MCP selected altitude, this occurs:
* ALT HOLD is the engaged mode and shows on the FMA in
green letters
* The ALT HLD mode selector switch LEDs turn on
* The V/S arms and V/S shows on the FMA in smaller white
letters.
The crew turns the V/S control wheel to set the climb or descent
rate. The pitch mode changes to V/S so this occurs:
* The LEDs on the ALT HLD mode selector switch go out
* The LEDs on the V/S mode selector switch turn on
* The pitch mode annunciation is V/S in green letters.
Level Off
As the airplane approaches the altitude, the crew can slowly
decrease the V/S to zero with the V/S control wheel. The
airplane will stop its climb or descent and fly level.
Reversion Mode
If the airspeed decreases to 1.3 times the stall speed, the DFCS
will change to LVL CHG. If the airspeed increases to VMO, the
DFCS will change to LVL CHG.
DFCS - OPERATION - VERTICAL SPEED
EFFECTIVITY
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General
When the crew pushes the ALT HLD mode selector switch, the
airplane will try to hold the present altitude. The DFCS can also
automatically go into the altitude hold mode when it reaches the
altitude set on the MCP.
ALT HLD Mode Selector Switch
These things occur when the pilot pushes the ALT HLD mode
selector switch on the MCP:
* The DFCS tries to hold the present inertial altitude, if
available, or uncorrected barometric altitude if not available.
The airplane will overshoot the altitude and return to it
* The ALT HLD mode selector switch LEDs turn on
* The FMA shows ALT HOLD in green letters.
Reach MCP Altitude
This altitude hold sequence starts as the airplane approaches
the MCP selected altitude:
* The FMA shows ALT ACQ in green letters and the airplane
starts to level off
* The airplane holds the altitude set on the MCP
* The ALT HLD mode selector switch LEDs turn on
* The FMA changes to ALT HOLD in green letters.
DFCS - OPERATION - ALTITUDE HOLD
EFFECTIVITY
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EFFECTIVITY
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General
The level change (LVL CHG) mode lets the pilot change flight
levels with the DFCS and the A/T. The LVL CHG mode always
commands the airplane to the MCP selected altitude. If the
airplane is at the MCP selected altitude, LVL CHG will not
become active.
During LVL CHG, the autothrottle controls thrust. The DFCS
controls airspeed with the elevator. The speed reference is the
MCP selected speed.
LVL CHG Mode Selector Switch
The pilot must set a target altitude on the MCP before they push
the LVL CHG mode selector switch.
If the pilot pushes the LVL CHG mode selector switch when in
VNAV, the MCP IAS/MACH indicator shows the FMC target
speed. The DFCS controls to this speed until the pilot sets a new
speed in the window.
If the pilot pushes the LVL CHG mode selector switch when in
TO/GA, the MCP IAS/MACH indicator shows the higher of
these:
* Present airspeed
* Speed set in the MCP.
If the pilot pushes the LVL CHG mode selector switch when in
another mode, the MCP IAS/MACH indicator shows the present
airspeed.
For all selection methods, the DFCS controls to the speed on the
MCP IAS/MACH indicator until the pilot sets a new speed.
The airplane speed stays within these limits:
　
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