C.  Prepare for the Test
 S 865-236
 (1)
Supply electrical power to the airplane (AMM 24-22-00/201).

 S 865-235

 (2)  
Close these circuit breakers:

 (a)  P6 Main Power Distribution Panel 1) 6C1 ENG 1 FIRE/OVHT DET ALT PWR LOOP A
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A
747-400
MAINTENANCE MANUAL

CARD FILE, 
M5206 FIRE 
MISCELLANEOUS  DETECTION 
SWITCHING  FIRE CONTROL 
MODULE, M7317  MODULE, M7326 
SEE  A  SEE  B 

FLIGHT COMPARTMENT  E/E EQUIPMENT COMPARTMENT CENTER 
TEST FIRE/OVHT  FIRE/OVHT TEST SWITCH 
A 

SMOKE INDICATIONB LIGHT (RED)
Main Deck Cargo Compartment Smoke Detection System Component Location Figure 501 (Sheet 1)
F22487
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747-400
MAINTENANCE MANUAL

ELECTRONIC
REFLECTED LIGHT

TEST LED LIGHT BEAM
LIGHT TRAP (ON SOME (ON SOME AIRPLANES)
AIRPLANES)

C
WIRES TO CONNECTORS

EJECTOR
ELECTRICAL
SMOKE DETECTOR (32) SEE
C
CONNECTOR
VENTURI EJECTOR

D
SMOKE SAMPLING PORT (96)
Main Deck Cargo Compartment Smoke Detection System - Component Location
Figure 501 (Sheet 2)

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F22527
A
747-400
MAINTENANCE MANUAL

LOWER CARGO COMPARTMENT FLOOR PANEL
MAIN VACUUM MANIFOLD
PRESSURE SUPPLY LINE
FWD
VENTURI EJECTOR
SEE F
ELECTRICAL CONNECTOR PRESSURE SUPPLY LINE
E
VACUUM PRESSURE SUPPLYSENSE LINE (REFERENCE)LINE
RUBBER
TUBE

MAIN VACUUM
MANIFOLD
(REFERENCE)

VENTURI EJECTOR
CLAMPS
PRESSURE SWITCH
FWD
PRESSURE
SWITCH
ELECTRICAL
CONNECTOR

F
Main Deck Cargo Compartment Smoke Detection System Component Location Figure 501 (Sheet 3)
F22545
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 2) 6C2 ENG 2 FIRE/OVHT DET ALT PWR LOOP A 3) 6C3 ENG 3 FIRE/OVHT DET ALT PWR LOOP A 4) 6C4 ENG 4 FIRE/OVHT DET ALT PWR LOOP A 5) 6C5 ALTN PWR - APU FIRE/BLD DUCT OVHT LOOP A 6) 6H10 ENG 1 FIRE/OVHT DET LOOP A 7) 6H11 ENG 1 FIRE/OVHT DET LOOP B 8) 6G10, ENG 2 FIRE/OVHT DET LOOP A 9) 6G11, ENG 2 FIRE/OVHT DET LOOP B 10) 6H12, ENG 3 FIRE/OVHT DET LOOP A 11) 6H13, ENG 3 FIRE/OVHT DET LOOP B 12) 6G12, ENG 4 FIRE/OVHT DET LOOP A 13) 6G13, ENG 4 FIRE/OVHT DET LOOP B 14) 6H14, APU FIRE/BLD DUCT OVHT LOOP A 15) 6H15, APU FIRE/BLD DUCT OVHT LOOP B
 (b)  
P180 DC Power Distribution Panel
 1) 180D17 CMC ENABLE SWITCH

 (c)  
P7 Overhead Circuit Breaker Panel 1) 7H16 CARGO SMOKE - MAIN DECK ZN 1-8 DET A 2) 7H17 CARGO SMOKE - MAIN DECK ZN 1-8 DET B 3) 7H18 CARGO SMOKE - MAIN DECK ZN 9-16 DET A 4) 7H19 CARGO SMOKE - MAIN DECK ZN 9-16 DET B

 D. The FIRE/OVHT TEST Switch operational test
 S 865-253
 (1)  Push and hold the FIRE/OVHT TEST switch on the miscellaneous switch panel M7317 (P5).
　
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