757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 2(99)

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 (spoilers extended) and flaps are in the landing position. 2) 15 feet < RA <800 feet and speedbrake lever is above the
 trip point (spoilers extended).The speedbrake warning output from the landing warning module consists of the SPEEDBRAKES light and discrete output to EICAS. The microprocessor switching output circuits provide a ground signal to turn on the SPEEDBRAKES light. Ground signals are also provided to the EICAS computers which generate the EICAS message SPEEDBRAKES EXT, master CAUTION lights and owl aural caution. 1) Pressing the Master Caution light will reset only the
 caution light and owl aural caution. The SPEEDBRAKES amber light and the EICAS message SPEEDBRAKE EXT will remain on until the improper configuration is corrected by retracting the speedbrakes, climbing to 800 feet, or retracting the flaps.
 2)  The speedbrakes circuit can be tested by deploying the speedbrakes and pressing the LDG CONFIG test switch. This initiates a circuit test and generates the master CAUTION light, owl aural caution, SPEEDBRAKES light, and level B EICAS message SPEEDBRAKES EXT.
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 B. BITE
 (1)  The WEU power supply fault indicators, one for each module, latches to black when the corresponding power supply is operating properly. When a fault occurs, the indicator latches to yellow. In addition, a fault discrete signal is sent to the EICAS computer, to display a STATUS message on the upper EICAS display unit. Pressing the STATUS switch on the EICAS display select panel will display the WARN ELEX status message on the lower EICAS display unit.
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WARNING SYSTEM

* SEE THE WDM EQUIPMENT LIST
THE PSU RESET AND THE PSU A AND B FAULT INDICATORS ARE IN THE WEU BITE MODULE.

Warning System - Component Index
Figure 101

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M983WEU BITE MODULE, M1411
SEE
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WARNING ELECTRONICS UNIT, P51

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Warning System - Component Location Figure 102 (Sheet 1)
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CAPTAIN'S MASTER WARNING AND LOUDSPEAKER, B56 LEFT AURAL WARNING CAUTION LIGHTED SWITCH, S507
WARNING
P11 PANEL
SEEC  r
FIRST OFFICER'S MASTER WARNING DISCRETE WARNING AND CAUTION LIGHTED SWITCH, S508
CAUTION
DISPLAY MODULE, M779
SEEC a RIGHT AURAL WARNINGSEE D
LOUDSPEAKER, CAPTAIN'S AND B57
　
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