26-21-00
 ALL  ú ú 02 Page 505 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 865-167
 (14) Calculate the resistance Rc of the squib discharge circuit using this formula:
 Rc = RL (V1/V2) - RL
 S 755-040
 (15) Make sure Rc is equal to or less than 3 ohms.
 NOTE:  If Rc is more than 3 ohms the circuit can not supply sufficient current to fire the squib cartridge.
 S 865-041
 (16)
 Connect the electrical connector D584 for right fire extinguisher bottle squib 1 to the adapter cable for the test box.

 S 865-042

 (17)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)
EXTINGUISHER BOTTLES RIGHT

 (b)
EXTINGUISHER BOTTLE RIGHT

 S 865-043
 (18) Turn and hold the fire handle for engine 1 fully clockwise.
 (a)
Make sure the BOTTLE DISCHARGE light on the test box come on.

 (b)
Write the voltage on the multimeter (V1).

 S 985-168
 (19) Set the toggle switch on the test box to ON.
 (a) Write the voltage on the multimeter as (V2).
 S 865-044
 (20) Release the handle.
 (a)
Make sure the handle moves toward the center about 10 degrees.

 (b)
Make sure the multimeter shows 0 |2 volts.

 S 865-045
 (21)
 Set the toggle switch on the squib test box to OFF.

 S 865-046

 (22)
 Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)
EXTINGUISHER BOTTLES RIGHT

 (b)
EXTINGUISHER BOTTLE RIGHT

 (23)
 Disconnect electrical connector D584 from the test box.

 S 865-047
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-21-00
 ALL  ú ú 02 Page 506 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 975-048
 (24) Calculate the resistance Rc for the squib discharge circuit using this formula:
 Rc = RL (V1/V2) - RL
 (a)  Make sure Rc is equal to or less than 3 ohms.
 S 865-049
 (25)
 Push in the fire handle for engine 1 to the fully latch position.

 S 865-050

 (26)
 Remove the adapter cable from the squib test box.

 S 865-051

 (27)
 Do steps (1) thru (26) again to examine the secondary fire
 extinguishing circuits.

 G. Do a Test of the Bottle Discharge Circuit for Engine 2.
 S 865-052
 (1)  Attach the applicable adapter cable to the connector of the squib test box.
 NOTE: See the placard on the tester to determine the correct
____
 adapter.

 NOTE:____There are two squib circuits for each squib. Salect the squib 2A adapter for pins 3 and 4, and the squib 2B adapter for pins 6 and 7.
 S 865-053
 (2)  
Set the toggle switch on the squib test box to OFF.

 S 865-054

 (3)  
Connect connector D1322 for squib 2 for the left extinguisher bottle to the adapter cable for the test box.

 S 485-169

 (4)  
Connect the multimeter to the test box. Connect a 10 kohm resistor across the multimeter.

 S 865-164

 (5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
EXTINGUISHER BOTTLES LEFT

 (b)  
EXTINGUISHER BOTTLE LEFT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-21-00
 ALL  ú ú 02 Page 507 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 865-056
 (6)  Pull the fire handle for engine 2 on the Engine and APU Fire Control Panel, P8-1, to the emergency fire position.
 NOTE: To pull the fire handle into the fire position, it is
____ necessary to use the manual unlock push button behind the fire handle. When you turn the handle you must hold it against the stops while you get your values.
　
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