(f)  
The logic circuit control switching output circuits provide ground signals to the EICAS computer (AMM 31-41-00). The EICAS computer formats the FLAP, STABILIZER, PARKING BRAKE and SPOILERS messages for the Upper EICAS display. Ground signals are also applied to the Master Warning module and configuration warning light. This turns on the master WARNING and CONFIG warning lights. In addition, a ground discrete is provided to the aural warning module which causes it to sound the European siren.

 (g)  
A Takeoff configuration warning test is initiated by the CONFIG T/O - LDG test switch. Setting the test switch to T/O position simulates that the N1 is greater than 66.7 percent, which arms the takeoff warning logic. One or all configuration error conditions must be set to generate a takeoff configuration warning. The master warning turns on the CONFIG light and the siren. In addition, the EICAS displays the associated configuration error. The test stops when the test switch is released. The EICAS message displays remain on for 8 to 15 seconds.

 (7)  Landing Configuration Warning Module Function (Fig. 8)
 (a)  
The Landing configuration warning module provides aural and visual warnings for improper airplane configuration during landing. The module recieves a dual input of |12 volts dc and +5 volts dc from power supply modules A and B. Each voltage input line is diode-isolated and fuse protected.

 (b)  
The landing configuration warning consists of the master WARNING light, siren aural warning, CONFIG light, and level A EICAS message GEAR NOT DOWN.

 (c)  
The landing configuration warning logic is enabled when the module receives the landing gear not down and locked discrete signal from the proximity switch electronics unit.

 (d)  
When this logic is enabled and any of the following conditions occur, the landing configuration warning is provided. The outputs for each condition are as listed below: 1) The trailing edge flaps are set to 25 or 30 degrees:

 a) red master WARNING lights
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 31-51-00
 ALL  ú ú 02 Page 19 ú Jan 28/02

A
757
MAINTENANCE MANUAL

RESET A
CONFIGPSU RESET
T/O

TEST |12V
+12V
-12V

-12V
+5V
LDG

+5V
NO PSU RESET GEAR NOT DOWN (R)TAKEOFF
PSU A
T/O RESET B
SPEED BRAKES EXT (Y)CONFIG
PSU RESET
|12V
-12V

OFF PROC
L/R EICAS CMPTRRESET
+5V SELFPSU B TEST GOOD
CONFIG
TEST LDG
1
CONFIG TEST
T/O SW
GEAR NOT DOWN
TEST PANEL

AND LOCKED
MASTER2
DIM & TEST
RONE SHOT (140 S)ALL GEAR
(T/O INHIBIT)DN & LOCKED
INHIBIT
R PROX SW ELEX UNIT
NO INHIBIT
MASTER
DIM & TEST CONFIG
　
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