757 MAINTENANCE MANUAL
S 865-022
WARNING: DO NOT CLOSE THE CIRCUIT BREAKERS APPLICABLE TO THE FIRE
_______ EXTINGUISHERS. THE ACCIDENTAL RELEASE OF THE CONTENTS OF THE FIRE EXTINGUISHER BOTTLES CAN CAUSE INJURY TO PERSONS.
CAUTION: REMOVE THE ELECTRICAL POWER BEFORE YOU REMOVE THE ELECTRICAL
_______ CONNECTORS OR CIRCUIT CARDS. INDUCTIVE SURGES OR ARCING CAN CAUSE DAMAGE TO THE EQUIPMENT.
(4) Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:
(a)
11B20, FIRE DETECTION L ENGINE 1
(b)
11B21, FIRE DETECTION L ENGINE 2
(c)
11B22, FIRE DETECTION R ENGINE 1
(d)
11B23, FIRE DETECTION R ENGINE 2
(e)
11J26, FIRE DET ALTN PWR ENGINE LEFT
(f)
11J27, FIRE DET ALTN PWR ENGINE RIGHT
D. Do a Test of the Left Engine
S 035-001
(1)
Disconnect one wire from each of the switches, S10140 and S10139, for the turbine overheat detection on the left engine.
S 865-002
(2)
Close these two circuit breakers on the P11 panel:
(a)
11B20, FIRE DETECTION L ENGINE 1
(b)
11B21, FIRE DETECTION L ENGINE 2
S 755-003
(3) Make sure these indications occur in less than 2 to 6 seconds:
(a)
The L engine fire warning light, on the engine fire switch, comes on (P8).
(b)
The red master FIRE light (P1-3) comes on.
(c)
The red master WARNING lights (2), on the glare-shield panel, P7, comes on.
(d)
The L switch-light for the engine fuel control (P10) comes on.
(e)
The fire bell is heard.
S 755-004
(4) Make sure this EICAS message shows on the top display:
(a) L ENGINE FIRE
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A
757
MAINTENANCE MANUAL
S 755-030
(5) Make sure these EICAS messages show on the bottom display:
(a)
L TURB OH DET 1
(b)
L TURB OH DET 2
S 755-005
(6) Open these circuit breakers on the P11 panel:
(a)
11B20, FIRE DETECTION L ENGINE 1
(b)
11B21, FIRE DETECTION L ENGINE 2
S 435-006
(7)
Connect the wires which were disconnected on each of the switches, S10140 and S10139, for the turbine overheat detection on the left engine.
S 865-027
(8)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11B20, FIRE DETECTION L ENGINE 1
(b)
11B21, FIRE DETECTION L ENGINE 2
S 865-024
(9)
Push the ECS MSG switch on the EICAS maintenance panel (P61).
S 865-025
(10)
Push and hold the ENG test switch on the FIRE/OVHT TEST panel (P8).
(a)
Make sure these indication occur: 1) The L engine fire warning light, on the engine fire switch
(P8), comes on. 2) The red master FIRE light (P1-3) comes on. 3) The master WARNING lights (P-7) comes on.
(b)
The left switch-light for the engine fuel control (P10) comes on.
(c)
The fire bell is heard.
S 755-050
(11) Make sure these EICAS messages show on the bottom display:
(a) L ENGINE FIRE
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757 MAINTENANCE MANUAL
(b)
L TURB OH DET 1
(c)
L TURB OH DET 2
S 865-028
(12) Release the ENG test switch on the FIRE/OVHT TEST panel (P8).
(a) Make sure these indications occur: 1) The red L engine fire warning light goes out. 2) The red master FIRE light goes out. 3) The red master WARNING lights goes out. 4) The switch-light for the L engine fuel control goes out. 5) The fire bell stops.
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