S 434-015
 S 914-016
 (a)  Remove all foreign material that you find.
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747-400 MAINTENANCE MANUAL
 S 434-020
 (5)  Do the Squib Electrical Connection procedure to connect the electrical connectors to the squibs per the table that follows:
 ~....................................................... | BOTTLE | ELECTRICAL CONNECTOR | .........................................................
 | LEFT BTL A ENG 1 SQUIB  |  DM228C  |
 | LEFT BTL A ENG 2 SQUIB  |  DM228B  |
 | LEFT BTL B ENG 1 SQUIB  |  DM229C  |
 | LEFT BTL B ENG 2 SQUIB  |  DM229B  |
 | RIGHT BTL A ENG 3 SQUIB  |  DM230B  |
 | RIGHT BTL A ENG 4 SQUIB  |  DM230C  |
 | RIGHT BTL B ENG 3 SQUIB  |  DM231B  |
 | RIGHT BTL B ENG 4 SQUIB  |  DM231C  |

 2.............................….........................1
 S 094-021
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT REMOVE THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURIES AND DAMAGE TO EQUIPMENT.
 (6)  Do this task: Safety Lock Removal and LE Flap Activation (AMM 27-81-00/201).
 S 414-036
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (7)  
Close the leading edge flaps (AMM 27-81-00/201).

 S 864-030

 (8)  
Remove the DO-NOT-CLOSE tags and close the applicable circuit breakers:

 (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) 6H7 FIRE SWITCH UNLOCK
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 S 864-031
 (9)  Do these steps to do a test of the squib assembly installation:
 (a)  
Make sure that the airplane has electrical power.

 (b)  
Push and hold the TEST 1 switch on the squib test module M7327 on the overhead maintenance panel (P461) to examine the bottle A squibs. 1) Make sure that the ENG 1, 2, 3, and 4 lights go on.

 (c)  
Push and hold the TEST 2 switch on the squib test module M7327 on the overhead maintenance panel (P461) to examine the bottle B squibs. 1) Make sure that the ENG 1, 2, 3, and 4 lights go on.

 S 864-035
 (10) Put the airplane in it's usual condition.
 (a)  Remove the electrical power from the airplane if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 ENGINE FIRE EXTINGUISHER BOTTLE DISCHARGE CARTRIDGE (SQUIB) -
_____________________________________________________________ INSPECTION/CHECK
________________
 1.  General_______
 A.  This procedure does a check of the squibs installed in the engine fire bottles.
 TASK 26-21-04-206-001
 2.  The Squib Check (Fig. 601)_______________
 A.  General
 (1)  
There are two squibs installed on each of the fire bottles M228, M229, M230, and M231. These fire bottles are installed in the leading edge of the wing. To get access to these bottles, you have to extend the leading edge flaps.
　
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