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The A/T interfaces with these components:
* A/T servomotors (ASMs)
* Thrust resolver (TR) packs
* Gearbox with friction brake and clutches
* Mechanical linkages to connect T/Ls to ASMs
* A/T Arm switch and mode select switches on MCP
* Thrust lever takeoff/go-around (TO/GA) switches
* Thrust lever A/T disconnect switches.
A/T Interfaces
The A/T receives digital data from these components to
calculate servo motor rate commands to control engine thrust:
* Mode control panel (MCP)
* Flight control computers (FCCs)
* Electronic engine controller (EEC)
* Flight management computer (FMC)
* Radio altimeter (RA)
* Stall management yaw damper (SMYD)
* Air data inertial reference system (ADIRS)
* Autothrottle servo motors (ASM).
The A/T receives analog discrete inputs from these
components:
* Mode control panel (MCP)
* Thrust lever TO/GA switches
* Thrust lever A/T disconnect switches
* Autoflight status annunciators (ASAs).
The A/T sends mode data and control signals to these
components:
* ASAs
* ASMs
* FDAU
* FCCs
* FMCS
* DEUs.
A/T SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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DFCS Mode Control Panel (MCP)
The DFCS MCP has these switches for the A/T system:
* A/T ARM switch
* N1 mode selector
* Speed mode selector.
The A/T ARM switch is used to turn on the A/T.
The A/T N1 and speed modes may be selected manually from
the MCP. When DFCS is engaged, the FCC selects the A/T
modes with a mode request through the MCP to the A/T. In
DFCS VNAV mode, the FCC uses FMC flight plan data to select
the A/T modes.
The MCP sends discretes for the selected A/T mode, N1 or
speed, to the A/T. The MCP also sends the selected speed or
FMC target speed to the A/T to use during the speed mode.
TO/GA Switches
The thrust lever TO/GA switches send analog discretes to the
A/T. The TO/GA switches are used to select the takeoff or goaround
mode. On the ground, the TO/GA switches select the
takeoff mode. In the air, the TO/GA switches select the goaround
mode if this mode is armed.
Autoflight Status Annunciators (ASA)
When the A/T disengages, it sends a signal to the ASAs to show
a red flashing visual alert. You push the flashing red ASA A/T
light or one of the A/T disconnect switches on the thrust levers
to cancel the warning. This sends an analog signal to the A/T to
reset the warning. There are no aural alerts when the A/T
disengages.
Autothrottle Servo Motors (ASM)
The ASMs are below the aisle control stand and flight deck
floor. The ASMs receive digital thrust rate commands from the
A/T and change the data to electrical pulses to drive the servo
motors. The motors drive the thrust resolver (TR) packs through
a gearbox and slip clutch to move the thrust levers (T/Ls) to a
desired thrust resolver angle (TRA). The ASMs receive
maximum resolver position from the EECs. The ASMs monitor
the TRA position and will not allow the actual TRA position to
exceed the limit TRA position.
The ASMs send tachometer data and feedback signals to the A/
T.
Display Electronics Units (DEU)
The A/T sends mode data to the DEUs to show A/T modes of
operation on the FMA on the CDS.
A/T SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-31-00-002
The FMC calculates engine N1 limits and N1 targets during
each flight phase and sends the data to the DEUs. The DEUs
show N1 limits on the engine display. The DEUs send N1 targets
to the EECs.
SMYD
The stall management yaw damper (SMYD) sends minimum
operating speed data to the A/T for minimum speed floor
control.
Radio Altimeter
During approach, the radio altimeter (RA) sends radio altitude
data to the A/T. This data is used to arm the go-around mode
below 2000 feet, and during Flare RETARD mode, to retard T/Ls
to idle for landing.
FMC
The FMC calculates thrust N1 limits and N1 targets for each
flight phase. The data goes to the DEUs. The DEUs show the N1
limits on the engine display. The DEUs send the N1 targets to
the EECs which calculate equivalent TRA targets to send to the
A/T to set thrust. The FMC also sends N1 targets directly to the
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