B. Fire/Overheat Logic/Test Cards______________________________
(1)
Two AFOLTS (Automatic Fire/Overheat Logic/Test System) cards interpret detector switch signals, provide system functional tests, and output overheat warning and fault indication signals. Each card handles the overheat detection system for one engine.
(2)
The AFOLTS cards are located in the P54 card file.
C. Fire/Overheat Test Panel________________________
(1)
The fire/overheat test panel contains a momentary pushbutton switch
-ENG. This switch initiates a test of the strut overheat and engine turbine cooling overheat detection systems. The test results in cockpit fire and overheat indications.
(2)
The test panel also has an amber SYS FAIL - FAIL P-RESET switchlight. This switchlight indicates a fire, overheat, or smoke detection system failure. The switchlight is pressed to reset.
(3) The fire/overheat test panel is on aft pilots' control stand P8.Operation (Fig. 2)
_________
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A
757 MAINTENANCE MANUAL
SEE A
P11 CIRCUIT
BREAKER PANEL
STRUT OVERHEAT SWITCH (6 PLACES)
A
L ENG ENG BTL
ENG BTL R ENG OVHT a 1 DISCH
2 DISCHa OVHT a
a
SEE C
SEE B DISCH DISCH 12 12
RL IE
P54 - FIRE DETECTION
G
CARD FILE F
HT
SEED r Tr
M10443-ENGINE FIRE CONTROL PANEL
B
FIRE/OVHT
LOGIC/TEST
CARD 4
M10425
FIRE/OVHT LOGIC/TEST CARD 6 M10426
FIRE/OVHT TEST
SYS FAILWHL
ENG/APU
WELL
ENG CARGO
FAIL P-RESET
A
M10445-FIRE/OVHT TEST PANEL P54 - FIRE DETECTION CARD FILE
C D
Strut Overheat Detection Component Location
Figure 1
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757
MAINTENANCE MANUAL
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757
MAINTENANCE MANUAL
A. Functional Description______________________
(1)
The AFOLTS cards directly sense whether a switch is open or closed. Since a switch is either open or closed, detection control cards (used in engine and APU fire detection systems) are unnecessary.
(2)
When a detector switches trip temperature is exceeded, it closes, sending a ground signal to the AFOLTS card.
(3)
The AFOLTS card senses the signals from each loop and determines the appropriate output to the flight crew as shown on Table 1. Table 1 applies to the normal operating mode and the system test mode.
~........................................................... | INPUTS TO AFOLTS | AFOLTS OUTPUTS | | ..................................... | | STRUT | | | OVERHEAT | | LOOP 1 LOOP 2 | DETECTION | | | SYSTEMS | ............................................................. | ALARM ALARM | OVHT | | ALARM - - -| EICAS LOOP 1 | | - - -ALARM | EICAS LOOP 2 | 2.......................…...................................1
TABLE 1
Logic System Operation
Strut Overheat Detection Loops
Logic AND Configuration
(4)
A strut overheat indication is given by the following:
(a)
The appropriate amber engine overheat light - L or R ENG OVHT, on the P8 control stand, comes on.
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