26-21-01
 ALL  ú ú 02 Page 504 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-013
 (4)  Close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6C2, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 2
 2) 6G10, ENG FIRE/OVHT DET ENG 2 LOOP A
 3) 6G11, ENG FIRE/OVHT DET ENGT 2 LOOP B

 S 755-014
 (5)  Push and hold the FIRE/OVHT TEST switch on the M7317 module.
 (a)  Make sure the engine 1 and 2 fire switch lights come on and the engine 3, 4, and APU fire switch lights do not come on.
 S 865-016
 (6)  
Release the test switch on the M7317 module.

 S 865-017

 (7)  
Close these circuit breakers:

 (a)  P6 Main Power Ditribution Panel
 1) 6C3, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 3
 2) 6H12, ENG FIRE/OVHT DET ENG 3 LOOP A
 3) 6H13, ENG FIRE/OVHT DET ENG 3 LOOP B

 S 755-018
 (8)  Push and hold the FIRE/OVHT TEST switch on the M7317 module.
 (a)  Make sure the engine 1, 2, and 3 fire switch lights come on and the engine 4 and APU fire switch lights do not come on.
 S 865-020
 (9)  
Release the test switch on the M7317 module.

 S 865-021

 (10)
 Close these circuit breakers:

 (a)  P6 Main Power Ditribution Panel
 1) 6C4, ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 4
 2) 6G12, ENG FIRE/OVHT DET ENG 4 LOOP A
 3) 6G13, ENG FIRE/OVHT DET ENG 4 LOOP B

 S 755-022
 (11)
 Push and hold the FIRE/OVHT TEST switch on M7317 module.

 (a)  Make sure the engine 1, 2, 3, and 4 fire switch lights come on and the APU fire switch light does not come on.

 (12)
 Release the test switch on M7317 module.

 S 865-024
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-21-01
 ALL  ú ú 01 Page 505 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-025
 (13) Close these circuit breakers:
 (a)  P6 Main Power Ditribution Panel
 1) 6C5, ALTN PWR APU FIRE/BLD DUCT OVHT LOOP A
 2) 6H14, APU FIRE/BLD DUCT OVHT LOOP A
 3) 6H15, APU FIRE/BLD DUCT OVHT LOOP B

 S 755-026
 (14) Push and hold the FIRE/OVHT TEST switch on the M7317 module.
 (a)  Make sure the engine 1, 2, 3, 4 and APU fire switch lights come on.
 S 865-028
 (15)
 Release the test switch on the M7317 module.

 S 865-029

 (16)
 Close these circuit breakers:

 (a)  P7 overhead circuit breaker panel.
 1) 7H14, CARGO SMOKE DET LWR A
 2) 7H15, CARGO SMOKE DET LWR B

 S 755-030
 (17) Push and hold the FIRE/OVHT TEST switch on the M7317 module.
 (a)  Make sure the FWD CARGO FIRE and AFT CARGO FIRE lights come on.
 S 755-032
 (18) Release the test switch on the M7317 module.
 (a)  Make sure the 6H6 FIRE EXTINGUISHER LOWER CARGO circuit breaker on the P6 main power distribution panel is open.
 S 865-033
 (19) Push the FWD CARGO FIRE switch/light.
 (a)  Make sure the ARMED light comes on.
 S 865-034
 (20) Push the FWD CARGO FIRE switch/light.
 (a)  Make sure the ARMED light, on the switch, goes off.
 S 865-035
 (21) Push the AFT CARGO FIRE switch/light.
 (a)  Make sure the ARMED light comes on.
 S 865-036
 (22) Push the AFT CARGO FIRE switch/light.
 (a)  Make sure the ARMED light, on the switch, goes off.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-21-01
 ALL  ú ú 04 Page 506 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-038
 (23) Put the MASTER DIM & TEST switch S6, on the M7262 light control module, in the TEST position.
　
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