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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