POWERCMD G
REQ OFF
SUPPLY
NO. 1
MODECONT PNL
L MODE
STATUS POWER INDISENGAGE
28V DCP11
CHANNEL A PROCESSOR
& MONITORBAR STATUS
(OUT) MASTER TEST
28V DCBANK ANGLE(IN)
CROSSSELECT
F/DHDG/SPD/IAS/COUNTREAD/MODEMODEENGAGEARMENGAGECHANNELA/TMODEMD&TON
MACH SELECT UP/DN WRITE REQ STATUS REQ STATUS REQ COMM ARM
STATUS P
P
P
L

TMC F/D
A/TON
ARM
WWWWWWWRITE
READ/
DFDAU OFF
DISPLAY
ENCODERBUFFER
A
OFF
LWLW
LW
DISP RWRWRW
CAPT MACH ANGLE
BANK
AS IND SELECT
ALT
S
READ/
SEL SWITCH
ENCODERWRITEI
B
DISPLAY
GHDG SEL
MODE
CAPT, F/O BUFFER
N
L CMD, C CMDR CMDALT ALERT
SELECT
AIAS/MACH
SPD SELL CWS, C CWS R CWS
SWICHES
IAS/MACH,
L
STATUS SPEED
HDG, ALT,
SEL SEL
VERT SPD
IR
/O
F/O MACHMODEAS IND
F/D
HDG/SPD/IAS/COUNTREAD/MODEMODEENGAGEENGAGE REQ ARMCROSSA/TP
MD&T REQ
ONMACH SELECT UP/DN WRITE REQ STATUS REQ STATUS CHANNELARM R
BANK ANGLESELECT O
COMM
MASTER TEST
DISENGAGE

C
R FMC
CHANNEL B PROCESSOR
POWER INE& MONITOR S
BAR STATUS
MODES
REQ
I
28V DC

SERVOR BUS
B
POWER
N
ARMR MODE
SUPPLY
G
NO. 2 MODE
A
STATUS C
CONT PNL
ENGAGEP11
LEVER PWR
AFCS MODE CONT PANEL R SAM R FCC
Autopilot/Flight Director System Mode Control Panel Interfaces SchematicFigure 3 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 GUN 051, 104-999 ú 22-10-00
 ú ú 11 Page 8 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D01507
A

757
MAINTENANCE MANUAL

 (2)  
AIRPLANES WITH 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, elevator neutral shift transducers, and force 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.

 (3)  
Autopilot/Flight Director System Mode Control Panel Operation

 (a)  MCP Functional Partitioning
 1)  The MCP contains channels A and B which use a common display element. This prevents a single failure from causing a total loss of the MCP function. Each channel receives inputs from panel switches and encoders and processes the data independently.
 2)  GUN 001-050, 052-103 The A channel receives ARINC 429 data from the L and C FCCs, L FMC, and the TMC. Channel A transmits 429 data to the L and C FCCs, L FMC, TMC, and pilot's instruments.
 3)  GUN 051, 104-999 The A channel receives ARINC 429 data from the L and C FCCs, L FMC, and the TMC. Channel A transmits 429 data to the L and C FCCs, L FMC, TMC, DFDAU, and pilot's instruments.
 4)  The B channel receives 429 data from the R and C FCC, R FMC, and TMC. Channel B transmits 429 data to the R FCC, R FMC, and pilot's instruments.
 (b)  MCP Autopilot Engage Switch/lights
 1)  GUN 051; placing any one of the MCP engage switches in CMD (L, C, or R) generates an engage request signal. The L and C switch requests are processed by channel A; the R request by channel B. The switch hold solenoid is energized when the A/P solenoids are armed. The hold solenoid keeps the A/P engage switch in the CMD position.
 2)  AIRPLANES WITH CONTROL WHEEL STEERING; pressing any one of the CMD or CWS switch/lights (L, C, or R) generates an engage request signal. The L and C switch/light requests are processed by channel A; the R requests by channel B. Illumination of the dot-bar matrices on the switch/lights is controlled by status logic generated in the appropriate FCC. The matrix lights when the request is accepted.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-10-00
　
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