(1)  
Two A/P disengage switches (one on each control wheel) provide discrete signals to the FCCs which disengage the autopilot. The go-around switches (one for each FCC and TMC on each thrust lever) provide discretes to the FCCs to start the Go-Around (GA) mode.

AFDS Input Power

 (1)  
AIRPLANES WITHOUT CONTROL WHEEL STEERING; the FCCs receive 28v dc and 115v ac, 400 Hz power for internal use. The 115v ac is also reduced to 26v ac in the FCC and supplied to the autopilot servos position LVDT's and elevator neutral shift transducers. The MCP power supply receives 28v dc. Both the MCP and the FCC use 28v dc for the actuator and servo arm, engage, and disengage functions.

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 22-10-00
 ALL  ú ú 08 Page 6 ú Jan 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

A/P ENGAGE
F/D

A/T ARMIAS/MACH HDG L C R
VERT SPD ALT F/D
ON
OFF

ONMODE
SEL
REQ
3 25DN
AUTO
OFF

OFF DISENGAGE BAR
BANK
SERVO ON
LIMIT
ARM
DISENGAGE
UP

OFF MODE
STATUS 28V DC
S
L FCC SERVO PWR
I
L SAM
28V DC

GN
MODE
C FCC SERVO PWR
A
REQ 28V DC
L
L FCC
SERVO R FCC SERVO PWR
ARM /
I
B
MODE
O
PNL LTS P STATUS
P A
RO
L&R SAMS
C FCC
28V DC

C
L BUS

POWER
MODE NO. 1 S
E
SUPPLY REQ
L MODE
CONT PNL

SI
POWER IN
N
L FMC
DISENGAGE CHANNEL A PROCESSOR
P11 MODEMASTER TEST
& MONITOR
G
BAR STATUS REQ BANK ANGLE
CROSS F/D
MODE
SELECT
HDG/SPD/IAS/ COUNT READ/ MODE MODE ENGAGE ARM ENGAGE CHANNEL A/T
STATUSMD&T ON
MACH SELECT UP/DN WRITE REQ STATUS REQ STATUS REQ COMM ARM
28V DC(OUT) L
28V DC(IN) PPP
MODESTATUS F/D
A/T ON
ARM TMC
WWWWWWWRITEENCODER DISPLAY
READ/OFF
OFF LW LW
BUFFER
A LW
CAPT MACHAS IND
DISP RW RW RW
BANK
ANGLE

ALT SELECT
READ/
SEL SWITCH
ENCODER WRITE
B
DISPLAY
MODE
CAPT, F/OBUFFER
S
HDG SEL
L CMD, C CMD R CMD SPD SEL
SELECT
I
L CWS, C CWS R CWS ALT ALERT
SWICHES
IAS/MACH,
G
IAS/MACH
STATUS
HDG, ALT,
N
SEL VERT SPD
AL
SPEED I
SEL R
/O
F/O MACH MD&T
MODE
AS IND ON MACH SELECT UP/DN WRITE REQ STATUS REQ STATUS CHANNEL ARM R
F/DHDG/SPD/IAS/ COUNT READ/ MODE MODE ENGAGE ENGAGE REQARM CROSS A/T P REQ BANK ANGLECOMM
SELECT O
MASTER TEST R FMC
C
CHANNEL B PROCESSOR
DISENGAGE
POWER IN E
BAR STATUS
MODE S
& MONITOR S REQ
I
28V DC

SERVO R BUS
B
POWER
N
ARM R MODE
SUPPLY
G
NO. 2
MODE CONT PNL
A
STATUS P11 AFCS MODE CONT PANELR FCC R SAM
Autopilot/Flight Director System Mode Control Panel Interfaces SchematicFigure 3 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 GUN 001-050, 052-103 ú 22-10-00
 ú ú 07 Page 7 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D01504
A
757
MAINTENANCE MANUAL

A/P ENGAGE
F/D

A/T ARM IAS/MACHHDG VERT SPDALT L CRF/D
ENGAGE
ON CMD CMD ON
OFF
LEVER PWR
SEL 325DN
MODE REQ
OFF
LIMIT

CMD
AUTO BANK
OFF OFF OFF
C
SERVO
CMD CMD ARM
UP
OFF
OFF MODE
OFF
CMD
STATUS28V DC
OFF
S
L FCC SERVO PWR
I
CMD L SAMENGAGE
G
28V DCOFF
LEVER PWRC FCC SERVO PWR
NCMD
AMODE REQ 28V DC
CMD
L
L FCC
OFF B SERVO
R FCC SERVO PWR
ARMOFF
ICMD /
MODE
O
PNL LTS P
STATUS CMD
OFF PR
OFF
　
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