22-32-00
ALL ú ú 02 Page 8 ú Sep 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
OPER MODE
A/T ARMA/T MODE REQREQ IAS/MACHMODE CONTROL PANEL EPR OR THR
AS INSTALLED
CONTROL IN VNAVáA/T MODE REQáEPR REQ
FLIGHT MANAGEMENT áREQ IAS/MACH
COMPUTERS
áTHRUST LIMITMODE REQ
TO
GA
1
CLB2
THRUST LIMIT MODE REQTEMP SEL ASSUMED TEMP
CON CRZ
THRUST MODE
SELECT PANEL
BLEED
DISCRETES
ECS BLEED
CONFIGURATION CARD ATTITUDE & RATEINERTIAL REFERENCE UNITSAIR DATA SENSORSAIR DATA COMPUTERS AIR/GROUNDAIR GROUND RELAY FLAP POSITION FLAP/SLAT
ELECTRONIC UNIT
28V DC STANDBY BUS
115V AC LEFT MAIN BUS
28V DC LEFT MAIN BUS
28V DC LEFT MAIN BUS
RIGHT PLA POSITIONFROM RIGHT AUTOTHROTTLE
PLA TRANSDUCER
LEFT PLA POSITION
AUTOTHROTTLE DISENGAGE, GO AROUND &
THRUST REVERSER SWITCHES
SERVO DRIVE
TACH FEEDBACK
AUTOTHROTTLESERVO CLUTCH
THROTTLE LEVERFAST/SLOW ANGLE TRANSDUCER
A/T MODEEFIS SYMBOL
GENERATORS THROTTLELEVER ANGLE
ELECTRONIC ATTITUDE
COMMANDED EPR
DIRECTOR INDICATOR
RIGHT ENGINE EPR (ACTUAL AND COMMANDED)
LEFT ENGINE EPR (ACTUAL AND COMMANDED)
EPR BUG DRIVE
EICAS COMPUTERS
LIMIT EPR'S,COMMANDED EPR
MODE, TAT ACTUAL EPR
TAT - 12C CLB
TO1.65 1.651CLB 2GA POWER
1.8
1.281.28
TEMP SEL
1.4
1.0 EPR
CON CRZ
97.5 97.5
THRUST MODESELECT PANEL N1
327 327
AUTOTHROT DISC
EGI
A/T DISC EICAS DISPLAY UNIT
FLIGHT FAULTSTEST REQ
AUTOTHROTTLE
FUNCTIONSáEPRáSPDáFLCHáGAáRETARDáLIMITS SERVOAMP
REF EPRTHRUST
LIMIT
FUNCTIONS
áEPR REFáMAX EPR INPUT
SIGNAL
MANAGEMENTINTERNALMONITORS& SELF TEST POWERSUPPLIES
THRUST MANAGEMENT COMPUTER
AUTOTHROTTLE POWER LEVER
TO RIGHT ENGINE ANGLE TRANSDUCER
THROTTLE CABLES
FUEL FUEL FLOW
TRIM
GOVERNOR
AIR DATAENGINE BLEED
ENGINE STATUS P1, P
INT ELECTRONICACTUAL EPRENGINE CONTROL
ACTUAL EPR
EPR TRANSMITTER
A
757
MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-32-00
ALL ú ú 02 Page 9 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
MAINTENANCE CONTROL DISPLAY PANEL
Thrust Management System - Block Diagram
Figure 4
A
757 MAINTENANCE MANUAL
3) The A/T DISC light on panel P1-3 turns on when the autothrottle disengages.
(c)
Sensor Inputs
1) Sensor inputs to the TMC are:
a) Air data from ADCs
b) Attitude and rate from IRS
c) Aircraft configuration discretes
(d)
Control Inputs
1) Control inputs are received from three sources. The MCP provides A/T ARM, A/T mode select, and IAS/Mach select. The TMSP provides thrust limit mode requests and assumed temperature. Autothrottle mode requests; EPR, IAS, and Mach targets; and thrust limit mode request are supplied by the FMC when VNAV is engaged.
(e) TMC Internal Functions 1) Autothrottle functions (Fig. 5): a) Thrust is controlled in the EPR (or THR) mode to the computed EPR REF target. When VNAV is engaged, the FMC computes the EPR REF target. If the SPD mode is selected on the MCP, speed is controlled to the selected target on the IAS/MACH display. The FMC selects the target speed in the VNAV mode. In the Flight Level Change (FLCH) mode, thrust is controlled to computed EPR REF for climb and to the idle limit for descent. The TMC sets thrust to the EPR REF for an autothrottle only Go-Around, or controls rate of climb during Go-Around with an autopilot channel engaged in CMD and rate of retard during flare. All of these functions are subject to EPR, PLA, and speed limits. 2) Thrust Limit Functions: a) The REF and MAX EPR thrust limits are computed by the TMC. The limits are based on engine type, mode selected, flight conditions, and airplane configuration. 3) Input Signal Management:
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