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 B.  Each FCC generates F/D and A/P commands. The F/D commands are supplied to the EFIS symbol generators for display on the EADI. The F/D displays are enabled by the F/D switches on the MCP.
 C.  With the A/P not engaged, control wheel rotation provides input to the aileron power control units; rudder pedals and rudder trim control provide inputs to the rudder power control actuators. The output Linear Variable Differential Tranducers (LVDTs) of the ALCS and ARGS sense control surface movement. They generate aileron and rudder servo feedback commands for synchronizing the FCC to the control surface positions.
 D.  With the A/P engaged in single channel CMD, sensor signals are combined in the FCC and autopilot roll command signals drive the dedicated ALCS. Off-line FCCs synchronize to existing conditions. The F/D command bars are biased out of view for the FCC that has the autopilot engaged in CMD.
 E.  Two or three FCCs in CMDENG constitute the multi-channel engage (MCHENG) configuration for Autoland. In MCHENG, each engaged FCC receives dedicated sensor data and drives the dedicated ALCS and ARGS with roll and yaw servo commands.
 F.  Roll Axis Control Requirements
 (1)  
Roll axis control functions of the FCC provide roll attitude hold and programmed roll attitude control of the airplane. The ALCSs, provide for roll axis maneuvering, which drives the ailerons and spoilers through control wheel movement.

 (2)  
If a flight director is on, roll attitude inputs from the IRU provides F/D command to maintain the roll attitude of the airplane during aerodynamic disturbances.

 (3)  
Programmed attitude control is provided automatically:

 (a)  
From the Flight Management Computer System (FMCS) during lateral steering (LNAV mode).

 (b)  
During localizer capture and centerline tracking (LOC and APP modes).

 (c)  
During automatic compensation for wind drift (track conditions).

 (d)  
During runway alignment maneuvering prior to touchdown (APP mode).

 

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MAINTENANCE MANUAL

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Roll and Yaw Axis Control
Figure 1 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL

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Roll and Yaw Axis Control
Figure 1 (Sheet 2)

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 ú ú 10 Page 3 ú Dec 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 G.  Yaw Axis Control
 (1)  Yaw axis control functions provide directional control of the airplane during an autopilot dual or triple channel engaged controlled touchdown and rollout. During an ILS approach with two or three autopilots engaged, an FCC directional control module aligns the airplane on the centerline prior to touchdown and maintains the airplane on runway centerline after touchdown. During high speed rollout, the rudder is used for steering. Through an interconnect with the rudder pedals, nose wheel steering is used during low speed rollout.
 H.  Appropriate rate limiting and compensation signals are provided to the roll and yaw channels in each A/P mode. The validity of input data used in each mode is monitored and appropriate actions taken in the event a no computed data (NCD) bit is detected.
 I.  FCC Roll and Yaw Axes - Inputs and Outputs (Fig. 2)
 (1)  
Figure 2 shows the FCC inputs and outputs related to the roll and yaw axes. The inputs include mode requests (MCP), servo and surface position (ALCS & ARGS), flight reference data (IRU and ADC), and navigation data (ILS and RA). Runway length and horizontal steering commands are received from the FMC. The go-around switches on the thrust levers provide an input for engagement of G/A mode.
　
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