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FMC. The A/T system operates from takeoff to touchdown.
The A/T is part of the flight management system (FMS) which
includes DFCS, FMCS, and ADIRU.
Abbreviations and Acronyms
* ADI - attitude direction indicator
* AFCS - automatic flight control system
* AGL - above ground level
* A/P - autopilot (DFCS)
* A/T - autothrottle
* ASA - autoflight status annunciator
* ADIRU - air data inertial reference unit
* ADIRS - air data inertial reference system
* ASA - autoflight status annunciator
* ASM - autothrottle servo motor
* BARO - barometric altitude
* capt - captain
* CDS - common display system
* CDU - control display unit (FMC)
* clb - climb
* clr - clear
* cmd - command
* con - continuous
* CPU - central processing unit
* CTM - cycle time monitor
* dc - direct current
* deg - degrees
* des - descent
* DEU - display electronics unit
* DIP - dual in-line package
* disc - disconnect
* disen - disengage
* DFCS - digital flight control system
* DFDAU - digital flight data acquisition unit
* DU - display unit
* EEC - electronic engine control
* elex - electronics
* FADEC - full authority digital engine control
* FCC - flight control computer
* FD - flight director (DFCS)
* FDAU - flight data acquisition unit (DFDAU)
* FDR - flight data recorder
* F/D - flight director
* flt - flight
* FMA - flight mode annunciation
* FMC - flight management computer
* FMCS - flight management computer system
* FMS - flight management system
* F/O - first officer
* fwd - forward
* G/A - go-around
* gnd - ground
* GMT - greenwich mean time
* GW - gross weight
* IAS - indicated airspeed
* KTS - knots (nautical miles per hour)
AUTOTHROTTLE SYSTEM - INTRODUCTION
EFFECTIVITY
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* L - left
* LSK - line select key
* MCP - mode control panel
* MCU - modular concept unit
* MMO - maximum operating mach
* N1 - low speed compressor RPM
* N2 - high speed compressor RPM
* NCD - no computed data
* POR - power on reset
* PROM - programmable read-only memory
* pth - path
* R - right
* R - repeat
* RA - radio altimeter
* RPM - revolution per minute
* R/T - receiver/transmitter
* SMYD - stall management yaw damper
* spd - speed
* SSM - sign status matrix
* sw - switch
* TACH - tachometer
* TAS - true airspeed
* TAT - total air temperature
* THR HLD - throttle hold
* T/L - thrust lever
* TMA - thrust mode annunciation
* TMD - thrust mode display (same as TMA)
* TOD - top of descent
* T/O - takeoff
* TO/GA - takeoff/go-around
* TRA - thrust lever resolver angle
* V - volts
* VMO - maximum operating velocity
* VNAV - vertical navigation mode
* V/S - vertical speed
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EFFECTIVITY
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AUTOTHROTTLE SYSTEM - INTRODUCTION
AUTOTHROTTLE SYSTEM - INTRODUCTION
EFFECTIVITY
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General
The autothrottle (A/T) computer receives inputs from airplane
systems, sensors, and flight deck switches to calculate and
control engine thrust.
Operator interface with the A/T system is through switches on
the thrust levers and the DFCS MCP. A/T modes of operation
can be selected in these ways:
* Manual mode selection from the DFCS MCP
* Automatic mode selection by DFCS when engaged
* Manual selection from thrust lever TO/GA switches.
The A/T system can be engaged in N1 mode or speed mode,
depending on the mode selected and the DFCS mode of
operation. A/T operational modes show on the flight mode
annunciation (FMA) on the common display system.
A/T System Components
　
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