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commands for VOR/LOC on course or selected bank angle limit
of 10 degrees. The airplane roll attitude must be within 14
degrees of the F/D commands for all other modes. If the
airplane roll attitude is not within these limits, the A/P goes into
CWS roll and the F/D roll mode is reset.
The airplane pitch attitude must be within 3 degrees of the F/D
commands for slaved G/S engage and MCP ALT ACQ mode.
The airplane pitch attitude must be within 6 degrees of the F/D
commands for all other pitch modes. If the airplane pitch
attitude is not within these limits, the A/P goes into CWS pitch
and the F/D pitch mode is reset.
Training Information Point
The autopilot in the engaged mode is not certified for takeoff.
DFCS - OPERATION - ENGAGE AUTOPILOT
EFFECTIVITY
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DFCS - OPERATION - ENGAGE AUTOPILOT
DFCS - OPERATION - ENGAGE AUTOPILOT
EFFECTIVITY
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General
The F/D display shows roll and pitch commands during takeoff.
The pilot cannot use the A/P for takeoff. The roll mode is
heading select and the pitch mode is TO/GA. After the airplane
goes through 400 feet radio altitude, the pilot can stay in the F/D
takeoff mode or engage the autopilot to a roll and pitch mode.
The F/D does not give runway steering or rotation commands.
This is the takeoff sequence:
* Before takeoff roll
* Takeoff roll
* Lift-off
* Climbout.
Before Takeoff Roll
The pilots set all of these conditions before they start the takeoff
roll:
* The captain and the first officer F/D switches are in the ON
position
* Select the runway heading with the heading selector
* Select the bank angle limit with the bank angle limit control
* Set the MCP altitude with the altitude select control
* Arm the autothrottle
* Select V2 speed with the IAS/MACH select control.
These annunciations show on the captain and first officer
displays:
* FD as the DFCS status
* No pitch mode annunciations
* The F/D integrated command cue is biased out of view (BOV)
* The selected target speed bug on the MASI shows the V2
speed.
The master flight director indicator light adjacent to the F/D
switch that was turned on first comes on.
Takeoff Roll
When the pilot pushes a TO/GA switch on the thrust levers,
these events occur:
* The FMA shows TO/GA as the active pitch mode
* The F/D pitch command shows a pitch down attitude of 10
degrees
* The F/D roll command shows the heading error
* Both master lights come on to show that the F/Ds are
independent
* The autothrottle engages in the takeoff thrust mode
* The FMA shows HDG SEL as the active roll mode.
When the airspeed is 60 knots, the F/D shows a pitch up
command of 15 degrees. If an engine fails, the AC bus transfers
to the good engine. The FCC on the failed engine gets the F/D
commands from the unswitched FCC. The F/Ds will then show a
pitch command of 12.5 degrees.
DFCS - OPERATION - TAKEOFF
EFFECTIVITY
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In takeoff, the flight director commands show on the AIs
automatically even if the flight director switches are in the OFF
position. This is the pop-up mode. It occurs when these
conditions are true:
* A flight director switch is not in the ON position
* The pilot pushes a TO/GA switch
* The airspeed is more than 80 knots.
The F/Ds stay in the pop-up mode for 150 seconds after the
airspeed reaches 80 knots. To turn off the F/Ds while in the popup
mode, you must set a F/D switch to the ON position and then
to the OFF position.
When both F/Ds are on, you can turn one off and the other stays
on.
Lift-Off
For a normal lift-off, the F/D goes from a 15 degree nose up
command to a speed or attitude command. The initial speed
target is V2 plus 20 knots. The change to speed control is a
function of altitude rate.
If the climb rate is less than 300 FPM, the pitch command holds
the pitch attitude. For a climb rate between 300 FPM and 1200
FPM, the pitch command holds a mixture of pitch and airspeed.
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