1) Two F/D toggle switches control the left and right flight director displays.
(b)
Command Engage Switches
1) Three CMD ENGAGE switches (L, C, R) provide inputs for command engage logic to dedicated FCCs.
(c)
AIRPLANES WITH CONTROL WHEEL STEERING; Control Wheel Steering Engage Switches 1) Three dedicated CWS ENGAGE switches (L, C, R) establish the
control wheel steering mode of the autopilot.
(d)
Other MCP controls associated with the roll and yaw modes. 1) LNAV switch/light 2) HDG HOLD switch/light
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FIRST OFFICER'S
A/P COMMAND FLIGHT DIRECTOR CAPTAIN'S
SWITCH
LNAV MODE HEADING HEADING ENGAGE SWITCHES
GUN 051 GUN 001-050,052-999
Mode Control Panel - Roll and Yaw Controls Figure 6
D00368
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MAINTENANCE MANUAL
3) HDG SEL knob
4) HDG SEL switch (within HDG SEL knob)
5) Selected HDG display
6) LOC switch/light
7) APP switch/light
8) GUN 001-050, 052-999;
B/CRS switch/light
(2) Command Roll Mode Functions (Fig. 7)
(a)
Simultaneous Modes
1) Simultaneous modes are those in which both pitch and roll control laws engage at the same time. These modes are Takeoff (T/O), and Go-Around (G/A).
(b)
Control Inactive
1) Control Inactive is the configuration of the AFDS when no autopilot or flight director is engaged. During control inactive, the FCC processes roll angle commands from Runway Alignment, Heading/Track, and Localizer Processors to produce the Roll Attitude Command. This maintains a roll attitude reference when the A/P is not engaged and generates a roll to wings level command at CMDENG. The aileron servo command synchronizes to aileron position when the A/P is not engaged. This permits a smooth transition to A/P control at CMDENG. Processors not active in command computations synchronize to maintain a zero output.
(c)
Takeoff Mode (F/D only)
1) The takeoff mode has two submodes: on-ground and in-air. In the on-ground submode, the F/D provides a 8-degree nose-up command for initial climbout. The F/D also provides a wings level roll command.
2) In the in-air submode, the F/D pitch command is referenced to the speed schedule with flap position and engine failure corrections. The F/D roll commands provide ground track hold after lift-off. There is no F/D yaw axis control.
(d) Go-Around
1) The AFDS provides commands for a positive rate of climb using a speed reference schedule based on flap position. Roll channel commands initiate go-around (G/A) ground track hold. This mode is manually selected by pressing the go-around switch on the throttles.
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PRESS GO AROUND SWITCH YAW AXIS CONTROL MAINTAINED DURING MULTICHANNEL GO AROUND. YAW SYNCHRONIZING COMMANDS TO UNPRESSURIZED RUDDER SERVOS IN SINGLE CHANNEL GO AROUND
GO AROUND
PITCH AXIS COMMANDS FORWARD ACCELERATION AND MODE
POSITIVE RATE OF CLIMB, USING SPEED SCHEDULE BASED ON FLAP POSITION ROLL AXIS COMMANDS INITIAL GA GROUND TRACK HOLD AT GO AROUND EXIT, G/A MODE IS MAINTAINED AS EITHER A CMD ROLL OR A CMD PITCH ENGAGED MODE
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