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TMCS -FLIGHT DECK COMPONENT LOCATIONS
TMCS Component Locations -P55
These are the components of the TMCS on the P55 glareshield center panel:
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Autothrottle (A/T) mode switch (2) on mode control panel (MCP)
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A/T arm switch (2) on MCP.
TMCS Component Locations -P10
These are the components of the TMCS on the thrust levers and below the control stand:
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Takeoff go-around (TO/GA) switch (2)
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A/T disconnect switch (2)
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A/T servo motor (ASM) (2), one on each side below the control stand.
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777 AIRCRAFT MAINTENANCE MANUAL
TMCS -FLIGHT DECK COMPONENT LOCATIONS
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TMCS -MAIN EQUIPMENT CENTER COMPONENT LOCATIONS
TMCS Component Locations -MEC
The thrust management computing function (TMCF) is part of the airplane information management system (AIMS). The left AIMS cabinet is on the E3-1 shelf. The right AIMS cabinet is on the E2-1 shelf.
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TMCS -MAIN EQUIPMENT CENTER COMPONENT LOCATIONS
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777 AIRCRAFT MAINTENANCE MANUAL
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TMCS -INTERFACES -1
General
The left and right AIMS cabinets receive inputs from and send outputs to many components, sensors, and switches for the thrust management computing function (TMCF). These interfaces are on the flight controls ARINC 629 data buses, the systems ARINC 629 data buses, or analog discrete signals.
The IOMs show the inputs that come directly from TMCF components.
ADIRU Inputs -Flight Control Bus (L and R)
The air data inertial reference unit (ADIRU) sends these parameters and status to the TMCFs:
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Altitude
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Vertical speed
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Air speed
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Mach
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Temperature
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Ground speed (G/S).
The TMCFs use this data to calculate the A/T modes and thrust limits.
SAARU Inputs -Flight Control Bus (C)
The secondary attitude air data reference unit (SAARU) sends these backup parameters to the TMCFs:
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Altitude
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Vertical speed
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Air speed
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Mach
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Temperature
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Ground speed (G/S).
The TMCFs use this data to calculate the A/T modes and thrust limits.
PFC Outputs -Flight Control Bus (L, R, and C)
The PFCs receive this data from the TMCFs:
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Left engine idle discrete
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Right engine idle discrete
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Left engine fail
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Right engine fail
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Speed mode
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Go around mode (GA).
AFDC Inputs -Systems Bus (L, R, and C1)
The AFDCs send a flare retard command to the TMCFs when the airplane is in the final land (autoland) configuration. This causes the TMCF to command the throttles to idle at a set A/T rate. The TMCFs also receive AFDCs status.
The pitch speed command lets the AFDCs and the TMCFs coordinate in flight level change (FLCH) and takeoff/go around (TO/GA).
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TMCS -INTERFACES -1
The AFDCs also send voted TO/GA to the TMCFs. The AFDCs receive a discrete signal from the TO/GA switch. The AFDCs send a digital voted TO/GA signal to the TMCF. The TMCF uses the voted TO/GA signal to engage take off or go-around modes.
AFDC Outputs -Systems Bus (L, R, and C1)
The TMCF sends this data to the AFDCs:
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A/T engage
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Command altitude rate
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Engine fail and operating discretes
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A/T mode discretes.
CDU Inputs -Systems Bus (L and R)
The CDU sends thrust limit mode and derated thrust limit data and status to the TMCFs.
ASCPC Inputs -Systems Bus (L and R)
The air supply cabin pressure controllers (ASCPCs) sends engine bleed data to the TMCFs to calculate the lower thrust operating limit.
CTC Inputs -Systems Bus (L and R)
The cabin temperature controllers (CTCs) send cabin bleed data to the TMCFs to find the lower thrust operating limit.
PSEU Inputs -Systems Bus (L and R)
The proximity switch electronic units (PSEUs) send air/ground logic to the TMCFs. The in air logic enables A/T mode operation and inhibits takeoff (TO) mode engage in the air. The on ground logic enables TO mode engage and inhibits all other A/T modes of operation.
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