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 E.  Controls
 (1)  
The A/T ARM switch is on the left side of the Mode Control Panel (MCP). When armed, the MCP allows crew selection of autothrottle control modes. Engagement is accomplished directly through the EPR (or THR), SPD, and FLCH mode select switches, or indirectly through the VNAV mode select switch. When in the VNAV mode, the FMCS selects autothrottle modes and thrust limits.

 (2)  
The thrust mode select panel (TMSP) allows crew selection of thrust limit modes, alternate thrust limit ratings, and assumed temperature.

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MAINTENANCE MANUAL

TMC SERVO28V DCL BUS
TMC DC
POWER28V DCC
SUPPLY
STBY BUSAUTO FLT WARNLEFT/RIGHT
EICAS CMPTR115V AC PWR GOOD
THRUST 5V DC SENSEL BUS A MODEA/T
TMC AC  SELECT
DISC P11
PANEL
A/T DISCGND TEST DATAWARN. FAULT DATASYS 1& BITE
THRUST
AIR/GND
LIMIT
RELAY
BLEED DISCRETES

C MCDPGND TEST REQUESTGND TEST CONTROL DATA
RIGHT
LEFT
ECS BLEED CONFIG
CARD

RIGHT LEFT A/T DISCONNECT SW'S
IRUTHRUST
GO AROUND SW'S
RIGHT

LEVER ASSYDATALEFT
BUS
AIR DATA CMPTR
INPUTS
RIGHT
LEFT
ENG EEC

RIGHT
LEFT
FMC
B

PROGRAM PINS
MUX
FLAP POSFSEU 1 A/T ARM
A CMDA/TSERVO CMD
A/T SERVOMOTORSERVO AMP
TACH FEEDBACK GENERATOR
AFCS
MODE
CONTROL

REVERSE THRUST SWMICROAUTOTHROTTLE
SW PACKB RIGHT
LEFTPWR LEVERANGLE
EFISSYMBOL GENLEFT
THRUST MANGEMENT COMPUTER  CENTER
B RIGHT
Thrust Management System - General
Figure 1 (Sheet 1)

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TABLE 1 INPUT PARAMETERS  TABLE 2 OUTPUT PARAMETERS

 

TMS Digital Inputs and Outputs
Figure 1 (Sheet 2)

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MAINTENANCE MANUAL

 F. Thrust Lever Switches
 (1)  Disengagement of the autothrottle occurs if: either of two autothrottle disconnect switches (one on each thrust lever) is pressed, the A/T ARM switch on the MCP is positioned to OFF, or either thrust lever is set in the reverse thrust position. Pressing either of two go-around switches on the thrust levers causes the TMS to adjust thrust for a go-around.
 G. Sensors
 (1)  The Inertial Reference Units (IRUs) and Air Data Computers (ADCs) provide environmental and attitude data to the TMS. The EPR transmitters provide actual EPR via the EICAS computers, and the autothrottle Power Lever Angle (PLA) transducers provide power lever angle to the TMS. The ECS bleed configuration cards provide engine bleed discrete signals.
 H. Outputs
 (1)  TMS outputs consist of:
 (a)  
TMC output to the servomotor generator which drives the thrust lever cables through no-back clutches.

 (b)  
Fault data output to the MCDP.

 (c)  
Display of the engaged autothrottle mode on the EADI.

 (d)  
Display of thrust limit modes and calculated thrust limits on the EICAS display unit.

 (e)  
Reference "bug" on EPR indicator (EICAS display unit) driven to calculated limit.

 I. Annunciation
 (1)  Annunciation of the engaged autothrottle mode appears on the left side of the Electronic Attitude Director Indicator (EADI). Thrust limit modes are selected on the TMSP and displayed on the EICAS display unit. Upon autothrottle disengage, the A/T DISC light illuminates on center instrument panel P1-3.
　
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