A/T ARM A/P ENGAGE
LCR

IAS/MACHHDG VERT SPDALT
L NAV
B/ CRSCMD CMD CMD F/D DHON
F/DGS250GS250
LEFT DH RIGHT
ON  110110
5 25
OFF  EADI EADI
SEL EPR V NAV
LOC CWS CWS CWS OFF
BANKDN
LIMIT

AUTO SEL OFF SPD FL CH HOLD V/S HOLD APP DISENGAGE
A/TA/TUP
SPD CMD SPD CMDFLARE
ROLLOUT FLARE
ROLLOUTG/S
LOC G/S LOC
MODE CONTROL PANEL (EXAMPLE) CAPTAIN'S
FIRST OFFICER'SINSTRUMENT
A/P DISENGAGE SWITCH I N S T R U M E N T S W I T C H I N G
INSTRUMENTSWITCHING
SWITCHINGPANEL
PANEL
LEFTCENTERRIGHTGO AROUND
SYMBOLSYMBOLSYMBOL
GENERATOR GENERATOR GENERATORSWITCHES EICAS A/P DISCA/P DISCONNECT WARN LT
RIGHT AUTOLANDFLIGHT
LEFT AUTOLANDSTATUS ANNUNCIATOR
STATUS ANNUNCIATOR AUTOPILOT AUTOPILOT CAUTION LT
CONTROLSLEFT FCC
SYSTEMS CENTER FCC L SAM LEFT STAB TRIM MODULE
RIGHT FCC R SAM RIGHT STAB TRIM MODULE
SERVO CMDS &
STABILIZER TRIM
POSITION FEEDBACK
ELEVATOR ASYMMETRY
MODULES LEFT ROLLOUT GUIDANCE SERVO
LINKAGETO
AUTOPILOTRUDDER
CENTER ROLLOUT GUIDANCE SERVO
FLIGHT MANAGEMENT COMPUTERS

DIRECTIONALCONTROLSERVO SIGNALS SYSTEM
THRUST MANAGEMENT COMPUTERRIGHT ROLLOUT GUIDANCE SERVOINERTIAL REFERENCE SYSTEM
AIR DATA COMPUTING SYSTEM
RADIO ALTIMETER SYSTEM
LEFT PITCH SERVOLINKAGE
INSTRUMENT LANDING SYSTEM

TO
FLIGHT DATA RECORDER SYSTEM

ELEVATORELEVATOR
CENTER PITCH SERVOMAINTENANCESERVO SIGNALS
CONTROL
ENGINE INDICATION AND

ELECTRICAL POWER SYSTEM
CONTROL DISPLAY
SYSTEM RIGHT PITCH SERVO
PANEL
CREW ALERTING SYSTEM
LEFT LATERALPINS
PROGRAMCONTROLMACH AIRSPEEDSERVO
INDICATORS LINKAGEAILERON
CENTER LATERAL
TOSERVO
CONTROLAILERONSERVOCONTROL
SYSTEM LEFT ELECTRICAL POWER SUPPLY SOURCES
RIGHT LATERALCENTER ELECTRICAL POWER SUPPLY SOURCESCONTROLRIGHT ELECTRICAL POWER SUPPLY SOURCES SERVO
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 22-00-00
 ALL  ú ú 09 Page 3 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
Autopilot Flight Director System
Figure 2

C99112
A

757 MAINTENANCE MANUAL
 (b)  AIRPLANES WITHOUT CONTROL WHEEL STEERING this section covers the general description of the autopilot/flight director roll and yaw channel. It gives the component details and operation of the Autopilot Rollout Guidance Servos (ARGSs), Autopilot Lateral Control Servos (ALCSs), ARGS and ALCS electrohydraulic servovalve and solenoid valves.
 (5)
Autopilot/Flight Director Warning and Annunciation (AMM 22-14-00)

 (a)  This section covers the description of the autopilot/flight director warning and annunciation. It covers the component details and operation of the autoland status annunciators, autopilot caution and disconnect lights, and Engine Indication and Crew Alerting System (EICAS) autopilot displays.

 (6)  
Autopilot/Flight Director Interchannel Data (AMM 22-15-00)

 (a)  This section covers the general description and operation of cross channel data buses. Digital data is transmitted between the three flight control computers.
 C. Yaw Damper System (AMM 22-21-00) (Fig. 3)
 (1)  
The yaw damper system provides commands to the rudder that dampen undesirable side slip and provide coordination for normal turns. The system consists of a control panel with status indication, two yaw damper servos, and two yaw damper modules. The yaw damper modules receive data from the Air Data Computers (ADCs) and Inertial Reference Units (IRUs). The modules also receive on-off commands from the control panel. The modules send status information to the control panel, and electrical control commands to the two yaw damper servos. The servos translate the electrical commands to mechanical outputs which drive the rudder system.

 (2)  
This section covers the general description of the yaw damper system. It gives the component details and operation of the yaw damper panel, Yaw Damper Modules, Yaw Damper Servos (YDSs), and YDS electrohydraulic servovalve and solenoid valves.

 D. Automatic Stabilizer Trim and Mach Trim/Speed Stability (Fig. 4)
　
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