E. Discharge Tube Pressure Test
 S 035-046
 (1)  Disconnect the discharge tubes from the discharge ports on the cargo fire bottle.
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A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 485-047Connect a pressure source to the forward cargo discharge tube.
 (3)  S 485-048Install the plugs on the fire extinguishing nozzles in the forward cargo compartment.
 (4)  S 785-049Pressurize the fire extinguishing tubes to 50-55 psig. (a) Wait a minimum of 3 minutes for the air pressure to become stable.
 (5)  S 785-050Turn off the pressure source. (a) Make a record of the air pressure. (b) Wait 10 minutes, then measure the pressure. 1) Make sure the pressure has not decreased by more than 0.5 psig.
 (6)  S 785-051Bleed the fire extinguishing tubes to 0 psi.
 (7)  S 085-052Disconnect the pressure source from the forward cargo discharge tubes.
 (8)  S 085-053Remove the plugs from the discharge nozzles in the forward cargo compartment.
 (9)  S 485-055Connect a pressure source to the aft cargo discharge tube.
 S 485-056

 (10)
 Install the plugs on the fire extinguishing nozzles in the aft cargo compartment.

 S 785-057

 (11)
 Pressurize the fire extinguishing tubes to 50-55 psig.

 (a)  Wait a minimum of 3 minutes for the air pressure to become stable.
 S 785-058
 (12) Turn off the pressure source.
 (a)  
Make a record of the air pressure.

 (b)  
Wait 10 minutes, then measure the pressure.

 1)  Make sure the pressure has not decreased by more than 0.5 psi.
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737-300/400/500MAINTENANCE MANUAL
 S 785-059
 (13)
 Bleed the fire extinguishing tubes to 0 psi.

 S 085-060

 (14)
 Disconnect the pressure source from the aft cargo discharge tube.

 S 085-061

 (15)
 Remove the plugs from the discharge nozzles in the aft cargo compartment.

 S 435-062

 (16)
 Connect the discharge tubes to the discharge outlets on the bottle.

 (a)  
Apply a layer of compound, BMS 3-27 to the threads where the tube attaches to the discharge port.

 (b)  
Connect the tube to the discharge port.

 NOTE: The yellow tube supplies extinguishant to the
____ forward cargo compartment. The blue tube supplies extinguishant to the aft cargo compartment.
 (c)  
Remove all unwanted compound, BMS 3-27.

 (d)  
Tighten the nut on the tube assembly.

 F. Put the Airplane Back to its Usual Condition
 S 415-063
 (1)  
Install the lining at the aft end of the forward cargo compartment.

 S 415-064

 (2)  
Close the forward cargo door, 4404R.

 TASK 26-23-00-705-094
 7. Cargo Fire Extinguishing Bottle Squib Circuit Alternate Test
____________________________________________________________
 A. General
_______
 (1)  The squib circuit test should be performed every time the Cargo Fire Control Panel, ir a fire bottle is disconnected from the airplane wiring.
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