(10)
 AMM 80-11-02/401, Engine Start Valve

 B.  Access
 (1)  Location Zones
 221 Control Cabin LH
 222 Control Cabin RH

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747-400 MAINTENANCE MANUAL
 412 Engine 1 - High Pressure Compressor Case 422 Engine 2 - High Pressure Compressor Case 432 Engine 3 - High Pressure Compressor Case 442 Engine 4 - High Pressure Compressor Case
 (2)  Access Panel 315AL Access Door 416 Right Thrust Reverser Half - Engine 1 426 Right Thrust Reverser Half - Engine 2 436 Right Thrust Reverser Half - Engine 3 446 Right Thrust Reverser Half - Engine 4 452AR Access Door, Forward Thrust Reverser To Strut Mid
 Fairing - System 1 462BR Access Door, Forward Thrust Reverser To Strut Mid Fairing - System 2 472BR Access Door, Forward Thrust Reverser To Strut Mid Fairing - System 3 482AR Access Door, Forward Thrust Reverser To Strut Mid Fairing - System 4
 C. Procedure
 S 865-007
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 865-249
 WARNING:_______DO NOT TURN THE FIRE SWITCH. IF YOU TURN THE FIRE HANDLE, THE CONTENTS OF THE FIRE BOTTLE WILL BE RELEASED, AND MAY HARM PERSONS OR DAMAGE EQUIPMENT.
 (2)  Make sure these circuit breakers are closed:
 (a)  P6 Main Power Distribution Panel
 1) 6H1, FIRE EXTINGUISHER ENG 1&3 B
 2) 6H2, FIRE EXTINGUISHER ENG 1&3 A
 3) 6H3, FIRE EXTINGUISHER ENG 2&4 B
 4) 6H4, FIRE EXTINGUISHER ENG 2&4 A
 5) 6H5, FIRE EXTINGUISHER APU
 6) 6H6, FIRE EXTINGUISHER LOWER CARGO
 7) 6H7, FIRE SW UNLOCK (PASSENGER)

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747-400 MAINTENANCE MANUAL
 D. Test the Power source for the Fire Extinguishing Systems
 S 865-009
 (1)  Open these circuit breakers:
 (a)  
P6 Main Power Distribution Panel 1) 6C2, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 2 2) 6C3, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 3 3) 6C4, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 4 4) 6C5, ALTN PWR APU FIRE/BLD DUCT OVHT LOOP A 5) 6G10, ENG FIRE/OVHT DET ENG 2 LOOP A 6) 6G11, ENG FIRE/OVHT DET ENG 2 LOOP B 7) 6G12, ENG FIRE/OVHT DET ENG 4 LOOP A 8) 6G13, ENG FIRE/OVHT DET ENG 4 LOOP B 9) 6H06, FIRE EXTINGUISHER LOWER CARGO 10) 6H12, ENG FIRE/OVHT DET ENG 3 LOOP A 11) 6H13, ENG FIRE/OVHT DET ENG 3 LOOP B 12) 6H14, APU FIRE/BLD DUCT OVHT LOOP A 13) 6H15, APU FIRE/BLD DUCT OVHT LOOP B

 (b)  
P7 Overhead Circuit Breaker Panel 1) 7H14, CARGO SMOKE DET LWR A 2) 7H15, CARGO SMOKE DET LWR B 3) 7H16, CARGO SMOKE DETECT MAIN DECK ZN 1 & ZN 2 DET A 4) 7H17, CARGO SMOKE DETECT MAIN DECK ZN 1 & ZN 2 DET B 5) 7H18, CARGO SMOKE DETECT MAIN DECK ZN 3, 4, 5, 6 DET A 6) 7H19, CARGO SMOKE DETECT MAIN DECK ZN 3, 4, 5, 6 DET B

 S 735-010
 (2)  
Push and hold the FIRE/OVHT TEST switch on the M7317 (P5)
 miscellaneous switching module.

 (a)  
Make sure the light in the fire switch for engine 1 on the fire control module M7326 (P5) comes on (Fig. 501).

 (b)  
Make sure the engine 2, 3, 4 and APU fire switch lights, on the fire control module M7326 (P5), do not come on.

 (3)  
Release the test switch on the M7317 module (P5).

 S 735-012
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MAINTENANCE MANUAL

SQUIB TEST SWITCHES
A

Fire Extinguishing System - Component Location
Figure 501

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