*
TAT -total air temperature
*
T/D -top of descent
*
TMCF -thrust management computing function
*
thr -thrust
*
thr ref -thrust reference
*
TLC -thrust limit calculation
*
TLDB -thrust limit data base
*
TO -takeoff
*
TO/GA -takeoff/go-around
*
UTCF -universal time (coordinated) function
*
Vmo -maximum operating velocity
*
VNAV -vertical navigation
*
WES -warning electronic system
*
WEU -warning electronic unit
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THRUST MANAGEMENT COMPUTING SYSTEM (TMCS) -INTRODUCTION
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TMCS -GENERAL DESCRIPTION
General
The operator interface to the TMCS is through the control display units (CDUs) and the mode control panel (MCP). Several airplane systems and components send and receive TMCS information. TMCS information shows on the primary flight display (PFD) and the EICAS display.
TMCS Components
The TMCS has these components:
*
TMCF in AIMS cabinets
*
Autothrottle servo motors (ASMs)
*
A/T disconnect switches
*
Takeoff go-around (TO/GA) switches
*
A/T arm and mode switches on the MCP.
There are two TMCFs, one in each AIMS cabinet. Each TMCF gets digital and digital discrete data from airframe and engine components. The TMCF also receives flight deck commands (A/ T mode requests) and switch position inputs.
The TMCS does these sub-functions:
*
Autothrottle (A/T) control laws
*
Thrust limit calculation
*
Engine trim calculation
*
BITE and fault monitoring
*
TMCS annunciations.
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The ASMs receive digital commands from the TMCF and analog data from the MCP.
The A/T disconnect and TO/GA switches on the center aisle control stand supply disconnect, TO or GA inputs to the TMCF.
The MCP A/T arm and mode switches send digital control and mode data to the TMCF.
The A/T arm switches on the MCP supply analog arm or inhibit signals to the ASMs. They also supply engine trim enable logic to the electronic engine controls (EECs).
TMCS Interfaces
The TMCF receives data on the flight controls ARINC 629 data buses from these components:
*
Autopilot flight director computer (AFDC) (3)
*
Air data inertial reference unit (ADIRU)
*
Secondary attitude air data reference unit (SAARU)
*
Primary flight computer (PFC) (3).
The TMCF receives data on the systems ARINC 629 data buses from these components:
*
Air supply cabin pressure controller (ASCPC) (2)
*
Cabin temperature controller (CTC) (2)
*
Proximity switch electronics unit (PSEU) (2)
*
Warning electronic unit (WEU) (2)
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TMCS -GENERAL DESCRIPTION
*
Engine data interface unit (EDIU) (2) The TMCF sends display and fault data to the primary display
*
Overhead panel bus controller (OPBC) (2) function and the central maintenance computing function in the
* Flap slat electronics unit (FSEU) (2)
AIMS cabinets.
*
ARINC signal gateway (ASG) (2)
*
Control display unit (CDU) (3).
The TMCF receives ARINC 429 data from these:
*
Mode control panel (MCP)
*
Radio altimeter (RA) transceiver (xcvr) (3)
*
Autothrottle servo motor (ASM) (2).
The TMCF receives analog inputs from these:
*
Engine RPM, N1/N2
*
Fuel shutoff switch (2)
*
Master warning and caution light switch.
The TMCF also receives analog inputs from these:
*
Autothrottle (A/T) disconnect switch (2)
*
Takeoff go-around (TO/GA) switch (2)
*
Autothrottle servo motor (ASM) (2).
The TMCF sends data to these components and switches:
*
WEU (2)
*
EDIU (2)
*
AFDC (3)
*
Primary flight computer (PFC) (3)
*
Master warning and caution light switch (2)
*
ASM (2).
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777 AIRCRAFT MAINTENANCE MANUAL
TMCS -GENERAL DESCRIPTION
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