(a)  For voltage V1 in the range shown, make sure that voltage V2 is greater that or equal to the value shown in the cargo bay test voltage table.
 S 864-229
 (28)
 Set the toggle switch on the squib test box to OFF.

 S 864-230

 (29)
 Push the FWD ARMED switch to off.

 S 864-231

 (30)
 PASSENGER AIRPLANES AND FREIGHTERS; open this circuit breaker:

 (a)  P7 panel
 1) 7F23 LANDING GEAR DSP & CONT ALTN

 S 864-232
 (31)
 Open, then close these circuit breakers:

 (a)  P6 Main Power Distribution Panel
 1) 6H6 FIRE EXTINGUISHER LOWER LOBE

 (32)
 Disconnect the electrical connector from the squib test box.

 S 484-234

 (33)
 Connect electrical connector DM6742B, for the bottle D forward squib, to the squib test box.

 (34)
 Push the FWD ARMED switch to on.

 S 084-233
 S 864-235
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747-400 MAINTENANCE MANUAL
 S 864-236
 (35) Push the DISCH switch.
 (a)  PASSENGER AIRPLANES AND FREIGHTERS; make sure the BOTTLE DISCHARGE light on the squib test box stays off.
 S 864-237
 (36) PASSENGER AIRPLANES AND FREIGHTERS; close this circuit breaker:
 (a)  
P7 panel
 1) 7F23 LANDING GEAR DSP & CONT ALTN

 (b)  
Make sure the BOTTLE DISCHARGE light on the squib test box is on.

 S 974-238
 (37)
 Make a record of the voltage shown on the multimeter (V1).

 S 864-239

 (38)
 Set the toggle switch on the squib test box to ON.

 S 974-240

 (39)
 Make a record of the voltage shown on the multimeter (V2).

 (a)  For voltage V1 in the range shown, make sure that voltage V2 is greater that or equal to the value shown in the cargo bay test voltage table.
 S 864-241
 (40)
 Set the toggle switch on the squib test box to OFF.

 S 864-242

 (41)
 Push the FWD ARMED switch to off.

 S 864-243

 (42)
 PASSENGER AIRPLANES AND FREIGHTERS; open this circuit breaker:

 (a)  P7 panel
 1) 7F23 LANDING GEAR DSP & CONT ALTN

 S 864-244
 (43) Open, then close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6H6 FIRE EXTINGUISHER LOWER CARGO

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747-400 MAINTENANCE MANUAL
 S 764-245
 (44) Repeat the Forward Cargo Bay Fire Bottle Test using the AFT ARMED switch, and these connectors:
 BOTTLE______ CONNECTOR
 A DM7906C
 B DM7907C
 C DM7908C
 D DM6742C

 S 084-316
 (45)
 Disconnect the electrical connector from the squib test box.

 L.
Forward Overboard Exhaust Valve Test

 S 864-266
 (1)  
Make sure the forward overboard exhaust valve V462 is open.

 S 864-268

 (2)  
Make sure these circuit breakers are closed:

 (a)  P6 Main Power Distribution Panel
 1) 6K10 ENG 1 SPEED SENSE 1
 2) 6K11 ENG 1 SPEED SENSE 2
 3) 6K14 ENG 2 SPEED SENSE 1
 4) 6K15 ENG 2 SPEED SENSE 2

 S 864-269
 (3)  Set and hold the engine 1 and 3 N2 speed switches.
 (a)  Make sure the forward overboard exhaust valve, V462 is closed.
 S 864-271
 (4)  Push the AFT ARM switch to on.
 (a)  Make sure the forward overboard exhaust valve, V462 is open.
 S 864-272
 (5)  Push the FWD ARM switch to on.
 (a)  Make sure the forward overboard exhaust valve, V462 is closed.
　
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