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 (1)  
Autopilot (A/P) and flight director (F/D) engage requests are generated at the Mode Control Panel (MCP) and are supplied to the Flight Control Computers (FCCs). Once accepted, the autopilot (A/P) engage requests can result in the arming and engaging of the A/P servos.

 (2)  
Mode requests for both A/P and F/D operation are generated at the MCP and transmitted by digital data bus to the FCCs.

 (3)  
GUN 001-050, 052-999; the A/P disengage bar logic tells the FCC if the bar is up or down. This allows the FCC to enable or disable the A/P servos.

 (4)  
GUN 051; the FCCs provide engage and mode status to the MCP. Mode status is indicated by the dot-bar matrix on the select switch/lights. Flight director and autopilot engage status is indicated by the position of the CMD switches. Status is also indicated on the EADIs (Ref 22-14-00).

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A

757 MAINTENANCE MANUAL
LEFT FLIGHT CONTROL COMPUTER
CENTER FLIGHT
CONTROL COMPUTER AFCS MODE CONTROL PANEL
MAIN EQUIPMENT SEE B
CENTER ACCESS
DOOR, 119BL

FWD SEE A RIGHT FLIGHT CONTROL COMPUTER
MAIN EQUIPMENT CENTER A
THRUSTCONTROL
LEVERS (REF)
WHEELS (REF)
SEE C

SEE D
FLIGHT COMPARTMENT
A/P ENGAGEA/T ARM IAS/MACH HDG VERT SPD ALT
LCR CMDCMD
F/D OFF F/D
ON ONNORM 30SEL DNBANKSEL OFF OFFLIMITOFF OFF
UP
AFCS MODE CONTROL PANEL
B
OUTBOARD
SIDE
GO-AROUND SWITCHES
CAPTAIN'S OR FIRST
OFFICER'S AUTOPILOT
DISENGAGE SWITCH

FWD
THRUST LEVERS (REF)
CONTROL WHEELS (REF) C
D
Autopilot/Flight Director System - Component Location
Figure 1 (Sheet 1)

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757 MAINTENANCE MANUAL
LEFT FLIGHT CONTROL COMPUTER
CENTER FLIGHT CONTROL COMPUTER
MAIN EQUIPMENT
AFCS MODE CENTER ACCESS
FWD DOOR, 119BL CONTROL PANEL
SEE B RIGHT FLIGHT
SEE E CONTROL COMPUTER
MAIN EQUIPMENT CENTER
E
THRUST LEVERS (REF)
SEE HCONTROL WHEELS (REF)
SEE G
FLIGHT COMPARTMENT 
A/T ARM  IAS/MACH  HDG  VERT SPD  ALT  L  C A/P ENGAGE  R 
F/D ON  OFF  F/D ON 
SEL  5  25 
OFF  AUTO  SEL  BANK LIMIT  DN  OFF 
DISENGAGE 
UP 

AFCS MODE CONTROL PANEL
F SIDE OUTBOARD GO-AROUND SWITCHES
CAPTAIN'S OR FIRST OFFICER'S AUTOPILOT DISENGAGE SWITCH FWD
CONTROL WHEELS (REF) THRUST LEVERS (REF)
GH
Autopilot/Flight Director System - Component Location Figure 1 (Sheet 2)
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 GUN 001-050, 052-999 ú 22-11-00
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757
MAINTENANCE MANUAL

AFDS Power and Engage Interlocks
Figure 2

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757
MAINTENANCE MANUAL

 (5)  
AIRPLANES WITH CONTROL WHEEL STEERING; the FCCs provide engage and mode status to the MCP. Mode status is indicated by the dot-bar matrix on the select switch/lights. Flight director and autopilot engage status is indicated by the dot-bar matrix on the CMD and CWS switches. Status is also indicated on the EADIs (Ref 22-14-00).
　
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