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For a climb rate more than 1200 FPM, the pitch command holds
the target airspeed.
If an engine fails during takeoff, the target airspeed may change
to these values:
* Failure at less than V2 - V2 is the target airspeed
* Failure between V2 and V2 plus 20 - the existing IAS is the
target airspeed
* Failure at more than V2 plus 20 - there is no change to the
target airspeed.
The maximum airspeed limit is the flap placard speed until the
airplane reaches the MCP speed. The F/D bank angle limit is 8
degrees when the airplane is below 400 feet altitude.
Ten seconds after lift-off, the speed trim engages.
Climb Out
At a radio altitude of 400 feet, the master flight director indicator
light for the F/D that was the second one turned on, goes off.
The roll command continues to hold the selected heading and
the annunciation is HDG SEL. The pitch command continues in
TO/GA to hold speed, attitude, or a mixture of speed and
attitude. The pitch annunciation is still TO/GA. FD stays as the
active DFCS status until the pilot engages the autopilot.
DFCS - OPERATION - TAKEOFF
EFFECTIVITY
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When the radio altitude is more than 400 feet, you can change
the F/D pitch and roll modes. If you change just the pitch mode,
the roll mode stays in HDG SEL. In this case the F/D stays in
LNAV. You can change the roll mode without a change in the
pitch mode.
When the radio altitude is more than 400 feet, you can also
engage the autopilot in CMD. When you engage the A/P in
CMD, the pitch mode goes to LVL CHG and shows MCP SPD in
the FMA. The roll mode stays in HDG SEL. Only the master flight
director indicator light for the A/P in CMD is on. When you
engage the A/P, the speed trim stops and the auto stabilizer
trim starts.
DFCS - OPERATION - TAKEOFF
EFFECTIVITY
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22-11-00-083
DFCS - OPERATION - TAKEOFF
DFCS - OPERATION - TAKEOFF
EFFECTIVITY
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22-11-00-083
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DFCS - OPERATION - TAKEOFF
22-11-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
After the climbout from takeoff, the crew can continue with the F/
Ds and/or engage an A/P in CMD or CWS. The crew can engage
only one A/P in these flight sequences.
If the F/Ds are on or an A/P is in CMD, the crew can choose
DFCS modes with the mode selector switches on the MCP. If the
lights on the selector switches are on, the crew can deselect
that mode if they push the mode selector switch again.
The crew can use these roll mode selector switches during
climb, cruise and descent:
* LNAV
* HDG SEL
* VOR.
The crew can use these pitch mode selector switches during
climb, cruise and descent:
* VNAV
* V/S
* ALT HLD
* LVL CHG.
The roll and pitch modes show on the flight mode annunciators
(FMAs). This includes the engaged modes and the armed
modes.
LNAV
The roll commands come from the FMC when there is a valid
navigation data base and an active flight plan.
HDG SEL
In this mode, the airplane turns to the heading that shows in the
heading display on the MCP. The FCC calculates the command
from the difference between the airplane magnetic heading and
the MCP selected heading.
VOR
In this mode, the autopilot commands the airplane to fly a VOR
course that shows in the course indicator on the MCP. The VOR
receiver sends the FCC VOR radial data that the airplane is on.
The MCP sends the FCC the VOR course that the pilot wants to
fly. The difference or deviation is used to calculate the VOR
command.
VNAV
The pitch commands come from the FMC when these are
present:
* A valid navigation data base
* An active flight plan
* Valid performance data.
When the crew selects VNAV, the DFCS goes to either the VNAV
SPD or the VNAV PTH mode.
DFCS - OPERATION - CLIMB/CRUISE/DESCENT INTRODUCTION
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