TMCS -INTERFACES -1
*
Engine trim commands
*
Bleed data (configuration codes).
OPBC Inputs -Systems Bus (L and R)
The overhead panel bus controllers (OPBCs) send this data to the TMCFs:
*
FMC selector switch position
*
Left and right engine fire handle position
*
L/R engine anti-ice switch position
*
Wing anti-ice switch position
*
L/R engine alternate mode.
FSEU Inputs -Systems Bus (L, R, and C1)
The flap slat electronics units (FSEUs) send flap angle data to the TMCFs.
ASG Inputs -Systems Bus (L and R)
The ASG sends this data to the TMCFs:
*
Left and right cowl anti-ice valve position
*
Left and right engine anti-ice valve position
*
Air/ground data from the weight on wheels (WOW) cards.
EFFECTIVITY BEJ ALL
RA RT Inputs -ARINC 429
The radio altimeter (RA) receiver transmitters (RTs) send radio altitude and status to the TMCFs in the AIMS cabinets. This provides A/T flare retard engage or inhibit logic just before touchdown.
Engine RPM (N1 and N2) Analog Inputs
The left and right engine RPM sensors send low (N1) and high (N2) engine RPM to the TMCFs.
Fuel Shutoff (SO) Switches Analog Discrete Inputs
The TMCFs receive the left and right fuel SO switch position as analog discretes. This helps the TMCFs determine engine status along with other inputs.
Master Warning and Caution Light Analog Discrete Inputs
The master warning and caution switch light supplies an analog discrete to the TMCFs to reset the caution lights. Push a master warning and caution switch light to reset the A/T disconnect function.
Master Caution Analog Discrete Outputs
The TMCFs send an analog discrete to the master warning and caution light switches. This causes the caution light to come on. This occurs when a manual or an automatic A/T disengage occurs.
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A/T Disconnect Switch Analog Discrete Inputs
The autothrottle (A/T) disconnect switch supplies a manual A/T disengage analog discrete to the TMCFs to disengage both A/T servo motors. A second push causes the TMCF to reset both the A/T function and the AUTOTHROTTLE DISC caution message on the EICAS display.
TO/GA Switch Analog Discrete Inputs
The takeoff/go around (TO/GA) switch sends a TO/GA analog discrete to the TMCFs to start the A/T mode. The TO/GA switch supplies logic to the AFDS for the TO/GA mode. The TO/GA switch analog discrete input is a backup to the voted TO/GA input from the AFDCs. On the ground, the thrust limit mode is TO for the TMCS. In the air, the thrust limit mode is GA for the TMCS.
AIMS Intercabinet Bus (ICB) Interfaces
The left and right TMCFs use the ICB to share and compare data.
The left TMCF and right TMCF calculate the same A/T commands. Only one TMCF is active. They compare these items:
*
Data bases
*
Input data
*
Sensor status
*
BITE results.
The active TMCF sends synchronization data to the non-active TMCF at these times:
*
When they do not agree
*
During power interrupts
*
At power up.
EFFECTIVITY BEJ ALL 22-31-00
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General
The active TMCF automatically sets the throttle levers in response to crew or system inputs.
Each autothrottle servo motor (ASM) needs power inputs and control signals from the AIMS cabinets and the mode control panel (MCP).
Power Interface
The P11 overhead circuit breaker panel supplies 28V dc to the left and right ASM for operation. On/off control comes from the mode control panel (MCP). The A/T ARM switches control 28v dc to the ASMs for servo motor operation.
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