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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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A/T SYSTEM - FORWARD EQUIPMENT COMPARTMENT LOCATION
A/T SYSTEM - FORWARD EQUIPMENT COMPARTMENT LOCATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The A/T computer receives and sends digital data and analog
discretes to and from system components, sensors and
switches. This section describes analog discretes.
Power
Two circuit breakers on the P18-1 circuit breaker panel supply
28v dc to the A/T. The A/T normally uses power from Bus 1. If
bus 1 fails, the A/T changes to bus 2. The A/T supplies 28v dc to
these components:
* A/T autoflight status annunciators (ASAs)
* A/T arm switch on mode control panel (MCP)
* Autothrottle servo motors (ASMs).
There are two circuit breakers, ASM 1 and ASM 2, on the front
of the A/T computer. These circuit breakers receive 28v dc from
the A/T computer and provide power to the ASMs. These circuit
breakers protect the A/T computer in case of a servo motor
overload. The ASM 1 circuit breaker supplies power to the left
A/T servomotor and the ASM 2 circuit breaker supplies power
to the right A/T servomotor. The circuit breakers also supply
power to the ASMs for engage logic.
Analog Discretes
The A/T receives these analog discretes:
* Takeoff/go-around request from the TO/GA switches
* Disengage/reset from the T/L disengage switches
* Disengage warning cancel/reset from the ASAs
* Selected pin options from program switch modules.
The A/T supplies these analog discretes:
* Disengage logic to the Capt and F/O ASAs
* Throttle hold mode annunciation logic to the DEUs
* A/T arm logic to the DFCS MCP.
A/T SYSTEM - ANALOG INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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A/T SYSTEM - ANALOG INTERFACE
A/T SYSTEM - ANALOG INTERFACE
EFFECTIVITY
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A/T SYSTEM - ANALOG INTERFACE
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The A/T computer receives digital data from system
components and sensors. The A/T computer uses this data to
activate A/T modes and to calculate thrust lever commands.
DFCS Mode Control Panel (MCP)
The MCP sends this data to the A/T:
* Target mach
* Target airspeed
* Selected altitude
* Flight path angle rate
* Spoiler position (left and right)
* DFCS discretes (modes).
The mach and airspeed is used by the autothrottle to control to
the MCP speed or FMC speed in the VNAV mode.
Flight path angle rate is used to reduce speed variations during
various pitch maneuvers (level change, altitude acquire etc).
The selected altitude is used to anticipate the new altitude
during altitude acquire.
Spoiler position is used for weight calculation and for thrust split
monitor during cruise.
The DFCS discretes send mode requests, N1 limit selection and
mode indications to the autothrottle.
Stall Management Yaw Damper (SMYD)
The SMYD sends this data to the A/T:
* Flap angle
* Minimum operating speed
* Flap up discrete
* Main gear down discrete
* Air/ground discrete.
The flap angle is used by the autothrottle to calculate lift and
drag coefficients.
Minimum operating speed is used as the minimum floor speed
in the autothrottle control logic.
The discretes are used in autothrottle control logic and BITE.
Flight Management Computer (FMC)
The FMCs send this data to the A/T:
* N1 targets
* Gross weight
* Minimum speed
* FMC altitude
* Static air temperature
* FMC modes
A/T SYSTEM - DIGITAL INPUT INTERFACE
EFFECTIVITY
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