(b)  
AIRPLANES WITHOUT CONTROL WHEEL STEERING; the AFDS can function with the A/P off, and the F/D on; or with single channel A/P engaged in CMD with the F/D on. The configuration for autoland operation is normally three channels but can be two autopilot channels in CMD and F/D off or on.

 (c)  
In CMD ENG, the AFDS provides flight path guidance and control using raw data input from interfacing sensors. In an FMS coupled mode, it receives computed VNAV and LNAV pitch and roll commands from the FMC. The AFDS also provides the commands for automatic stabilizer trim.

 (d)  
Full system monitoring and Built-In-Test Equipment (BITE) detect system faults in flight. This data is stored for recall by the MCDP after landing.

 (e)  
Digital interfaces between the AFDS and associated systems use ARINC 429 DITS buses.

 (2)  
AFDS Interfaces

 (a)  
Each FCC has two-way interfaces with all A/P servos, the MCP, the SAMs, the MCDP, and the other two FCCs.

 (b)  
Each FCC receives data from critical sensors (dedicated sources for AUTOLAND signals) and non-critical sensors (non-dedicated sources and switched inputs). Each FCC also uses signals from the A/P disengage switches, go-around switches, and FCC program pins.

 (c)  
Each FCC sends data to the Autoland Status Annunciator (ASA), the Engine Indication and Crew Alerting System (EICAS) (Ref 31-41-00), and symbol generators (SGs) of the Electronic Flight Instrument System (EFIS) (Ref 34-22-00, Flight Instrument System).

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MAINTENANCE MANUAL

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C28851
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757
MAINTENANCE MANUAL

26V ACPOWEREXC
115V AC
HA
BUS
R
L
SUPPLY
FLT CONT
INTERNALS
CMPTR PWR

HYD PWR
AFCS MCP

SAME AS
P
28V DC

A/P PITCHCONT COLUMN
BUS

CONTROL SERVOFLT CONT
L
A
HYD ARM INTERNALS
CMPTR SERVO
H
L SAME AS
SERVO DET ENGAGE
P11
H
R ELEV
CONT
R
C FCC LFORCEHYD PWR
C FCC
H
XDCR
P
SERVO CMD
L
HARM
HYDR FCC
R FCC H TO
CSERVO POSAILERON
L R AIL CONTDETENT
ACTUATORS
FORCE XDCR2ENGAGE H
A
26V AC EXC
L
HL
26V AC EXC
L
H
SVO VALVE

L
LH
A
CSURFACE POSREGULATOR
H  ELEV FEELAND CENTERING
A/P LATERAL CONTROL SERVO UNIT L ELEV NEUTRAL
H
C

SHIFT XDCR
L
SVO POS
H ACTUATORS
TO ELEVATOR
A
H

L
FLAP POS
L
SURFACE POS FLAP/SLAT ELECT
H
C

UNIT L
H
STAB. POS
L
A/P PITCH CONTROL SERVOL STAB. POS CONTINTERNALS
R
UNITSAME AS
COLUMN
SPD BRK
HAH
HYD PWRHANDLE POS
P
CL
A CONTROL SERVO
A/P PITCH
L
SPOILER CONT MODULE CONT
UNITHYD ARM
L
H

HB
HC
COLUMN
C FCC SERVO DET ENGAGE
L
C FCC
LL
A
H
INTERNALSSAME AS
UNITH
HSERVO CMD
HC
L
R ELEV
CONT
R FCC
C
H
R FCC
L L
CONTROL
WHEEL
L
L

C FCCFORCEC FCC
INTERNALS
SERVO POS
A
C
XDCR
SAME ASR ELEV
H
R ELEV CONTROLR FCC R FCC
H
26V AC EXC
A
FORCE XDCR
CONTROL
TO RUDDER
L
2 ACTUATORS
C FCC
H
FORCE
C FCC
L

26V AC EXC
L ELEV CONTROL
L
SURFACE POS

XDCR FORCE XDCR
C
2 H
R FCC
R FCC A/P ROLLOUT GUIDANCE L AIL CONTROL 2 AIRPLANES WITH CONTROL WHEEL STEERING
　
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