S 754-011
(2)
Make sure the applicable EICAS message shows on the top display for the card that is replaced.
AFOLTS CARD___________ EICAS MESSAGE
Card 1 M10224 L ENGINE FIRE Card 2 M10274 R ENGINE FIRE Card 3 M10400 APU FIRE Card 6 M10427 FWD CARGO FIRE
S 864-012
(3)
Release the ENG/APU/CARGO test switch.
S 714-028
(4)
Do the "Test of the Cargo Smoke Detection System" in the Operational Test - Lower Cargo Compartment Smoke Detection System (AMM 26-16-00/501).
Do a Test of the Engine Turbine/Strut Overheat Detection AFOLTS Cards Installation
S 864-013
(1)
Push and hold the ENG test switch on FIRE/OVHT TEST panel.
S 754-014
(2)
Make sure the applicable EICAS message shows on the top display for
the card which is replaced.
AFOLTS CARD___________ EICAS MESSAGE_____________
Card 4 M10425 L ENGINE FIRE
Card 5 M10426 R ENGINE FIRE
S 864-015
(3)
Release the ENG test switch.Do a Test of the Cards Installation for the Engine and APU Fire/Ovht Detection Systems
S 864-016
(1)
Push and hold the ENG/APU/CARGO test switch.
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(2) S 864-017Release the ENG/APU/CARGO test switch.
(3) S 864-018Push and release the ECS MSG switch on the EICAS maintenance panel.
(4) S 754-019Make sure the applicable EICAS message does not show on the top display for the card that is replaced.
FIRE/OVHT DETECTION LOOP CARD_____________________________ EICAS MESSAGE_____________
M681 M682 M683 M684 M685 M686 M10229 M10230 M10275 M10276 L ENG FIRE LP 1L ENG FIRE LP 2R ENG FIRE LP 1R ENG FIRE LP 2APU FIRE LP 1APU FIRE LP 2L ENG OH LP 1R ENG OH LP 1R ENG OH LP 2L ENG OH LP 2
G. Do a Test of the Istallation for the Duct Leak and Wheel Well Fire Card, M691
S 864-020
(1)
Push and hold the WHL WELL test switch on the FIRE/OVHT TEST panel.
S 754-021
(2)
Make sure the EICAS message, WHEEL WELL FIRE, shows on the top display.
S 864-022
(3)
Release the WHL WELL test switch.
H. Do a Test of the Installation for the Duct Leak and Wheel Well Power Supply Card, M10428
S 864-023
(1) Push and hold the WHL WELL test switch, on the FIRE OVHT TEST panel, for a minimum of eight seconds.
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(2) S 864-024Release the WHL WELL test switch.
(3) S 864-025Push and release the ECS MSG switch on the EICAS maintenance panel.
(4) S 754-026Make sure the EICAS message DUCT LEAK BITE does not show on the top display .
(5) S 864-027Remove electrical power if it is not necessary (AMM 24-22-00).
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ENGINE FIRE DETECTION - DESCRIPTION AND OPERATION
_________________________________________________
1. General_______
A. Dual-loop fire and overheat detection systems are installed in each engine area. These systems monitor engine and nacelle temperatures, and provide alerts for both fire and overheat conditions.
B. The four systems (left and right engine fire and nacelle overheat detection) use power from the 28-volt dc battery bus, with alternate power from the right main dc bus. The circuit breakers for each system are on overhead circuit breaker panel P11. The systems contain no on/off switches.
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