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757 MAINTENANCE MANUAL
THRUST MANAGEMENT WARNING AND ANNUNCIATION - DESCRIPTION AND OPERATION
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General (Fig. 1)
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A. The Thrust Management System (TMS) is monitored for autothrottle disengagement. Disengagement results in caution annunciations that include an amber A/T DISC light, an AUTOTHROT DISC message on the EICAS display unit (Ref 31-41-00), an aural warning, and flashing master CAUTION lights.
Component Details
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A. Autothrottle Disconnect Light
(1) The A/T DISC light is on the P1-3 panel. It is an amber, dual-lamp indicator. The lamps use 28 vdc from the master dim and test system. They are turned on by application of a ground from the TMC or the master dim and test system (Ref 33-16-00, Master Dim and Test).
Operation
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A. Functional Description
(1) Thrust Management System Warning and Annunciation (Fig. 2)
(a)
When the autothrottle disengages, the A/T DISC light turns on. The ground to this light is controlled by both hardware and software flip-flop outputs. The software logic and output driver is powered by normal 28 vdc. The hardware logic and output driver is powered by 28 vdc from the standby bus.
(b)
The hardware flip-flop is set when the watchdog monitor senses a fault, power failure occurs, or an A/T disengage switch is pressed. The software flip-flop is set by either a software sensed failure (no A/T ENABLE signal from TMS engage-disengage logic) or when the A/T disengage switch is pressed. The flip-flops are reset by a second press of a disengage switch, or re-engagement of the autothrottle.
(c)
The left and right EICAS computers annunciate the autothrottle disengage signal one second after a ground is provided for the A/T DISC light. This results in an AUTOTHROT DISC message on the EICAS display unit, and operates the master CAUTION lights and aural warning. Pressing a master CAUTION light resets both master CAUTION lights. However, the amber A/T DISC light and EICAS message remain until both flip-flops are reset.
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757
MAINTENANCE MANUAL
AUTOTHROTTLE
DISCONNECT MESSAGE
AUTOTHROTTLE DISCONNECT LIGHT
EICAS DISPLAY UNIT
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Flight Deck Indications Figure 1
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757
MAINTENANCE MANUAL
HARDWARE
SELECTED DE-RATE
TEMPERATURE THRUST MODE
SOFTWAREEPR NCD
1 SEC
TOTAL AIR
THRUST REVERSER
FROM
TAT+12CREV+20C REV
STATUS EEC
TEMPERATURE
EPR ACTUALL, R
D-TO 1.65
EPR ACTUAL L, R
1.65
REFERENCE/TARGET THRUST
MAXIMUM LIMIT (AMBER) 1.8
1.8
1.28
EPR ACTUAL L, R
1.28
REFERENCE/EEC OFF
TARGET CURSOR ACTUAL THRUST LEVELFROM
1.0 1.0
1.4 1.4
EEC
COMMANDED EPR EPR MAX
EPR MAXEPR MAX LIMITCOMMAND SECTOR PRIMARY THRUST PARAMETERTHRUST LEVEL TAT (FROM ADC)
TATTAT
ARINC EICAS DISPLAY 429 EICAS
TAT NCD
RX DISPLAYS
A
SELECTED TEMP
SEEA
MAN.THRUST MODES
EPR(FROM EICAS DSP)MAN. THRUST REF
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