(3) The fire/overheat test panel is on aft pilots' control stand P8.Operation (Fig. 2)
_________
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757
MAINTENANCE MANUAL
FROM ENGINE DETECTION
TURBINE SWITCH 2 S10140
SEE A
P11 CIRCUIT BREAKER PANEL
MIXER BLOCK
DETECTION SWITCH 1 S10139
TURBINE OVERHEAT SWITCHES
M10445 PANEL A
SEE B
P54 - FIRE DETECTION
CARD FILE
SEE C FIRE OVHT LOGIC/TEST CARD 4 M10425
FIRE OVHT LOGIC/TEST CARD 5 M10426
FIRE/OVHT TEST
SYS FAILWHL
ENG/APU WELL
ENG CARGO
FAIL
P-RESET
A
P54 FIRE DETECTION CARD FILE
M10445 FIRE/OVHT TEST PANEL BC
Engine Turbine Cooling Overheat Detection Component Location
Figure 1
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MAINTENANCE MANUAL
AUTOMATIC FIRE/OVERHEAT LOGIC TEST CARD (AFOLTS)
Engine Turbine Cooling Overheat Detection Schematic (Example)
Figure 2
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B85598
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A. Functional Description______________________
NOTE: The Engine Fire/Overheat Detection System works in a similar way
____ as the Engine Turbine Cooling Overheat Detection System. Some indications displayed may be the same for either system. Refer to AMM 26-11-00/001 for the descripion and applicable indications on the Engine Fire/Overheat Detection System.
(1)
The AFOLTS directly monitor the status of the detection switches (open or closed). Since the switch is either open or closed, detection control cards (used in engine and APU fire detection systems) are not used.
(2)
When turbine cooling air reaches the trip point of the switch, the switch opens, providing an alarm signal to the AFOLTS card. The AFOLTS card configures the signals from each system in AND logic, and determines the appropriate output to the flight crew as shown on Table 1. Table 1 illustrates the normal operating mode and is the same for the system test mode except a dual loop fault in the overheat will produce a FAIL output from AFOLTS.
~.......................................... | INPUTS TO AFOLTS | AFOLTS | | | OUTPUTS | | | | | LOOP 1 LOOP 2 | TURBINE | | | OVERHEAT SYSTEM | ............................................ | | | | ALARM ALARM | FIRE | | ALARM - - -| EICAS LOOP 1 | | - - -ALARM | EICAS LOOP 2 | | - - -| | 2.......................…..................1
TABLE 1
Logic System Operation
Engine Turbine Cooling Overheat Detection Loops Logic AND Configuration
(3) An engine turbine cooling overheat indication is given by the following:
(a)
The appropriate red (L or R) fire switch handle, on the P8 control stand, lights up and unlocks.
(b)
The appropriate red (L or R) fuel control switch, on quadrant stand P10, lights up.
(c)
The red FIRE light, on captain's instrument panel P1-3, comes on.
(d)
The appropriate fire warning message - L or R ENGINE FIRE, is displayed on EICAS (Engine Indication and Crew Alerting System
-P2 panel).
(e)
The red master warning lights, on glareshield panels P7, come on.
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