C. Prepare for the Removal
S 864-002
(1) Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags:
(a) 6C1, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 1
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747-400
MAINTENANCE MANUAL
FIRE CONTROL MODULE, M7326
Fire Control Module Installation
Figure 401
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(b)
6C2, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 2
(c)
6C3, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 3
(d)
6C4, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 4
(e)
6C5, ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT
(f)
6C6, FIRE SW UNLOCK (COMBI OR FREIGHTER)
(g)
6G10, ENG FIRE/OVHT DET ENG 2 LOOP A
(h)
6G11, ENG FIRE/OVHT DET ENG 2 LOOP B
(i)
6G12, ENG FIRE/OVHT DET ENG 4 LOOP A
(j)
6G13, ENG FIRE/OVHT DET ENG 4 LOOP B
(k)
6H1, FIRE EXTINGUISHER ENG 1&3 B
(l)
6H2, FIRE EXTINGUISHER ENG 1&3 A
(m)
6H3, FIRE EXTINGUISHER ENG 2&4 B
(n)
6H4, FIRE EXTINGUISHER ENG 2&4 A
(o)
6H5, FIRE EXTINGUISHER APU
(p)
6H6, FIRE EXTINGUISHER LOWER CARGO
(q)
6H7, FIRE EXTINGUISHER MN DK CARGO (COMBIS OR FREIGHTERS)
(r)
6H10, ENG FIRE/OVHT DET ENG 1 LOOP A
(s)
6H11, ENG FIRE/OVHT DET ENG 1 LOOP B
(t)
6H12, ENG FIRE/OVHT DET ENG 3 LOOP A
(u)
6H13, ENG FIRE/OVHT DET ENG 3 LOOP B
(v)
6H14, APU FIRE/BLD DUCT OVHT LOOP A
(w)
6H15, APU FIRE/BLD DUCT OVHT LOOP B
(x)
6L27, VOICE RECORDER
S 864-081
(2) Open these circuit breakers on the main power distribution panel, P7, and attach DO-NOT-CLOSE tags:
(a)
7H14, CARGO SMOKE DETECT LWR A
(b)
7H15, CARGO SMOKE DETECT LWR B
D. Remove the Fire Control Module
S 034-003
(1)
Loosen the quarter-turn-fasteners (6 places), and move the module until you can get access to the electrical connectors.
S 034-004
(2)
Support the module and remove these electrical connectors:
-DS211 - Engine 1 Switch
-DS212 - Engine 2 Switch
-DS213 - Engine 3 Switch
-DS214 - Engine 4 Switch
-DS246 - APU Switch
-DB7102 - RMT MIC Voice Recorder
-DM7326A - Lower Cargo FWD Arming Switch
-DM7326B - Lower Cargo AFT Arming Switch
-DM7326C - Cargo Fire Extinguishing Switch
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S 024-005
(3)
Remove the module and install the caps on the electrical connectors.
E.
Remove the Fire Switch
S 024-069
(1)
Remove the four mounting screws for each switch.
S 034-079
(2)
Move each switch back and then down from the fire control module. Do not remove the handle from the switch.
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