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on the MCP and selects LVL CHG. The A/T retards the engine
thrust to idle and the airplane descends to the selected altitude.
During LVL CHG descent, these are the mode annunciations:
* A/T goes from MCP SPD to RETARD to ARM mode
* A/T mode lights are off
* MCP IAS/MACH window shows the selected airspeed
* MCP SPD is the DFCS pitch mode.
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During LVL CHG descent, the A/T sets the thrust to idle, and the
DFCS uses the elevators to hold the selected MCP airspeed.
The airplane descends to the selected altitude on the MCP. At
level-off to this altitude, the A/T engages in speed mode and
controls the throttles to provide engine thrust to keep the
airplane at the MCP speed. The DFCS changes from LVL CHG
to ALT HOLD pitch mode and uses the elevators to hold the
MCP altitude.
V/S Descent
The V/S mode is another DFCS pitch mode used for descent (or
climb). You push the V/S mode switch on the MCP to arm V/S,
then set the V/S rate with the thumbwheel. These are the mode
annunciations:
* A/T goes to MCP SPD mode
* Speed mode light comes ON
* MCP IAS/MACH window shows selected airspeed
* V/S is the DFCS pitch mode.
In the DFCS V/S mode, the A/T controls thrust to keep a target
airspeed on the MCP. The DFCS uses the elevators to control to
a V/S descent rate on the MCP, and the airplane descends to
the target altitude on the MCP. When the airplane gets to the
selected altitude, the A/T stays in the speed mode as it
increases thrust to continue to maintain the MCP selected target
airspeed. The DFCS changes from the V/S mode to ALT HOLD
mode and uses the elevators to control and hold the MCP
altitude.
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A/T SYSTEM - OPERATION - DESCENT
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EFFECTIVITY
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General
During descent and before glideslope capture, the A/T is in
either the ARM mode or speed mode, depending on the mode
selected.
Descent Retard
During DFCS VNAV descent before glideslope capture, the A/T
will normally be in descent retard and set thrust to idle or it may
be in speed mode, depending on the DFCS pitch mode selected.
These are the indications during descent in VNAV SPD:
* A/T retards T/Ls to idle
* RETARD mode annunciates on the FMA then ARM
* N1 and Speed mode lights are off on the MCP
* MCP IAS/MACH window is blank.
To use the A/T in speed mode during descent, select speed
mode on the MCP. The DFCS can also select the A/T speed
mode. These are the indications during descent in A/T MCP
SPD:
* A/T is in MCP SPD mode on FMA
* A/T Speed mode light is ON on the MCP
* MCP IAS/MACH window shows pilot selected speed.
Glideslope (G/S) Capture
During descent, the DFCS approach mode (APP) may be
selected. At glideslope capture, the A/T mode is MCP SPD. The
DFCS pitch mode is G/S as the DFCS uses the elevator to hold
the glideslope vertical path. The A/T uses the selected speed on
the MCP to adjust the T/Ls for speed during the remainder of
the approach. During the approach, the pilot extends flaps and
reduces the airspeed on the MCP. These are the indications
after G/S capture:
* A/T goes to MCP SPD mode and Speed mode light is ON
* MCP IAS/MACH window shows the selected airspeed.
Flare Retard
During the approach while on glideslope, the A/T mode is MCP
SPD. At 50 feet radio altitude, the DFCS starts the flare
maneuver to touchdown and sends a flare discrete to the A/T.
FLARE shows as the active DFCS pitch mode on the FMA.
During DFCS flare, the A/T stays in MCP SPD mode until 24 feet
radio altitude and then commands flare retard and the T/Ls
move to the aft stops. These are the indications during flare:
　
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