S 745-005
(4) Push and hold the FIRE/OVHT test switch on the miscellaneous switching panel (P5).
NOTE: During the test, do not release the test switch until one of
____ these EICAS messages "FIRE TEST FAIL" or "TEST PASSED" shows. If you release the switch before the EICAS message "TEST PASSED" or "FIRE TEST FAIL" shows, the test will not be completed.
S 715-006
(5) Do a check for these conditions:
(a) The EICAS message TEST IN PROGRESS shows while the test continues. Make sure the EICAS message TEST PASSED shows when the test is completed.
NOTE: The EICAS message FIRE TEST FAIL can show as a result
____ of circuit breakers being open or a fault can exist on a related fire/overheat systems.
(b) Make sure these EICAS messages do not show:
1) FIRE ENG 1
2) FIRE ENG 2
3) FIRE ENG 3
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747-400 MAINTENANCE MANUAL
4) FIRE ENG 4
5) OVHT ENG 1 COWL
6) OVHT ENG 2 COWL
7) OVHT ENG 3 COWL
8) OVHT ENG 4 COWL
9) OVHT ENG 1 NAC
10) OVHT ENG 2 NAC
11) OVHT ENG 3 NAC
12) OVHT ENG 4 NAC
(c)
The engine 1, 2, 3, and 4 fuel control switches, S1863, S1864, S1865, and S1866 come on.
(d)
The red master warning light, on the main instrument light shield panel, P72, comes on.
(e)
You hear the fire bell from the flight compartment aural warning speaker.
(f)
The red lights on the engine 1, 2, 3, and 4 fire switch handles, on the pilots overhead panel, P5, come on.
S 755-008
(6) Push the red master warning light switch.
(a)
Make sure the red master warning light goes off.
(b)
Make sure you do not hear the fire bell.
S 215-009
(7) Release the FIRE/OVHT test switch.
(a)
Make sure the fire switch lights go off.
(b)
Make sure the EICAS messages do not show.
S 865-082
(8)
After the switch is released for approximately twenty seconds, make sure the status EICAS messages for the engine fire and overheat detection system do not show.
D.
Put the airplane back to its usual condition.
S 865-050
(1) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6C6 FIRE SW UNLOCK
2) 6H1 FIRE EXTINGUISHER ENG 1&3 B
3) 6H2 FIRE EXTINGUISHER ENG 1&3 A
4) 6H3 FIRE EXTINGUISHER ENG 2&4 B
5) 6H4 FIRE EXTINGUISHER ENG 2&4 A
6) 6H5 FIRE EXTINGUISHER APU
7) 6H6 FIRE EXTINGUISHER LOWER CARGO
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747-400 MAINTENANCE MANUAL
TASK 26-11-00-745-047
3. Ground Test - Fire System
_________________________
A. General
(1)
The ground test makes sure these components operate correctly:
-
the FIRE/OVHT Test Relays
-
the Afolts cards
-all wiring between the cards and the MAWEA card file
-
the EIU's
-
the Fire Detectors
(2)
This test does not do a check of the fire extinguishing system.
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