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22-11-00-088
When the control wheel force is in-detent, the A/P goes to the
attitude submode if the bank angle is more than 6 degrees. The
A/P goes to the heading hold submode if the bank angle is less
than 6 degrees.
If the A/P is in another roll CMD mode such as HDG SEL and the
control wheel is in hi detent, the A/P goes to the roll CWS mode.
This can also occur if the A/P is in the single approach mode.
DFCS - OPERATION - ROLL CWS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - OPERATION - ROLL CWS
DFCS - OPERATION - ROLL CWS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The vertical navigation (VNAV) mode supplies pitch control in
response to vertical navigation data from the FMC. VNAV
commands the airplane to climb or descend to the FMC target
altitude at the FMC target speed. If the airplane reaches the
MCP selected altitude first, it levels off at the MCP selected
altitude.
Push the VNAV mode select switch to activate VNAV. VNAV
becomes active when all these conditions are true:
* VNAV flight plan is active
* The airplane is more than 400 feet above the ground
* Data required to calculate the vertical guidance command is
valid.
VNAV has these two active modes:
* VNAV SPD (speed)
* VNAV PTH (path).
VNAV SPD
The VNAV SPD mode controls the elevator to hold the FMC
target speed. The mode is active while the airplane is climbing
to the FMC altitude. If it gets to the MCP altitude first, the A/P
disengages from VNAV SPD and goes into ALT HOLD. The
VNAV mode selector light does not go out because the
autothrottle is still in the FMC SPD mode.
When the crew resets the MCP altitude to the FMC altitude, the
VNAV mode selector light goes out. To go back to VNAV, the
crew pushes the VNAV mode selector switch. This reengages
VNAV SPD and the airplane starts to climb to the FMC target
altitude at the FMC target speed.
VNAV PTH
In climb, VNAV SPD changes to VNAV PTH to capture the FMC
target altitude. In the VNAV PTH mode, the airplane holds the
FMC altitude.
Before descent, the pilot sets an approach altitude on the MCP.
At the top of descent, the throttle retards and the A/T FMA
shows RETARD then ARM. The pitch mode remains in VNAV
PTH and the airplane descends. LNAV must be active during the
VNAV PTH descent mode. If LNAV is not active, VNAV PTH
mode will disengage, but the crew can select VNAV SPD for the
descent.
The VNAV PTH mode continues in descent until the airplane is
near the approach altitude. The autothrottle mode returns to
FMC SPD. VNAV PTH remains active and holds the approach
altitude.
DFCS - OPERATION - VNAV
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - OPERATION - VNAV
DFCS - OPERATION - VNAV
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-089
General
The crew uses the V/S mode to climb or descend to the altitude
set in the MCP. You cannot use the V/S mode if the airplane is at
the MCP selected altitude or in the capture of the MCP selected
altitude. If the airplane is at the MCP selected altitude and the
crew changes the MCP selected altitude by more than 100 feet,
the V/S mode will arm.
The crew can use the V/S mode to level the airplane at a set
altitude.
Climb/Descend to MCP Selected Altitude
These occur when the pilot pushes the V/S mode selector
switch and sets a positive or negative V/S on the MCP:
* V/S shows on the FMA in green letters
* The V/S mode selector switch LEDs turn on
* The airplane climbs or descends at the selected V/S.
When the crew pushes the V/S mode selector switch, the
present vertical speed of the airplane shows in the V/S display.
The crew changes the vertical speed with the V/S control wheel.
When the airplane reaches the altitude set on the MCP, the
DFCS mode changes from V/S to altitude acquire (ALT ACQ)
and then to altitude hold (ALT HOLD). When the DFCS goes into
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