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MAINTENANCE MANUAL
(a) In the flight director only mode, either or both F/Ds are on
and all A/P channels are disconnected. The F/D can use
stand-alone reference inputs (uncoupled FMC) or FMC steering
signals (coupled FMC) derived from a selected flight plan.
(b) The FCC generates F/D steering commands which are converted
into video signals in the EFIS SG and displayed on the EADI.
The F/D mode annunciation is also indicated on the EADI. The
pilot controls the airplane attitude to follow F/D commands
with control wheel and column movement.
(c) In the F/D only mode, surface position (aileron, elevator,
rudder) feedback is used to synchronize the servo commands to
null. All other signal loops are synchronized in the FCC.
Hydraulic power is always required to move control surfaces.
In the F/D only mode, solenoids in the actuators permit
mechanical input signals only to control surface position.
Autopilot servo commands are not used.
ATTITUDE REFERENCES
NAVIGATION
REFERENCES AIR DATA AIR DATA REFERENCES
ELECTRONIC
ATTITUDE
DIRECTOR
INDICATOR
Flight Director Only - Block Diagram
Figure 9
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(4)
(5)
(6)
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MAINTENANCE MANUAL
(d)
The AFDS is used in this condition for takeoff. Only wings
level, and rotation target angle guidance is available.AIRPLANES WITH CONTROL WHEEL STEERING; Control Wheel Steering Engage Block Diagram (Fig. 9A)
(a)
Inputs for the CWS ENG mode come from the MCP and control wheel and column manual forces.
(b)
Reference inputs come from attitude, heading, navigation and air data from sensor systems, and target references selected on MCP (display windows - ALT, V/S, HDG, IAS/MACH). Position feedback signals from A/P servos and mechanical feedback to control force transducers also serve as reference inputs.
(c)
The FCC provides servo commands to the A/P servos, F/D commands and annunciations to the EFIs, auto stabilizer trim commands, and caution and warning discretes.
Single Channel Command Engage (Fig. 10)
(a)
In the single channel CMD ENG mode, the A/P receives inputs from the MCP, FMC steering commands, or pilot-selected navigational commands.
(b)
Reference inputs come from the sensor system, FMC or MCP selected target references, position feedback from the A/P servos, and mechanical control feedback to the control wheel and column.
(c)
The FCC outputs in CMD ENG include servo commands to A/P servos, stabilizer trim commands, annunciaion discretes to the EFIS, and caution and warning discretes. Flight director bar commands to the EADI are inhibited in CMD ENG.
(d)
The CMD ENG mode is capable of all climb, cruise, and descent control. It is capable of single channel ILS approach control except for the runway alignment, flare, landing, and rollout control.
Multichannel Engage (Autoland) (Fig. 11)
(a)
Each FCC has dedicated interfaces with A/P reference sensors, A/P servos (LCS, RGS, PCS), EFIS symbol generators, the caution and warning system, and on electrical power source. Each FCC receives data from the AFCS MCP and each of the other FCCs.
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Control Wheel Steering Engage Block Diagram Figure 9A
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