(a)  Make sure that nitrogen flows freely from the AFT discharge hose of bottle 1.

 (5)  
Stop the dry nitrogen source.

 (6)  
Cap the AFT discharge hose of bottle 1 with a suitable cap.

 S 865-607
 S 425-608
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 S 785-627
 CAUTION:_______APPLY PRESSURE ONLY TO THE TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO THE DISCHARGE PORTS CAN OCCUR.
 (7)  Start the dry nitrogen source and apply pressure between 100 psig minimum and 120 psig maximum to the aft cargo compartment.
 (a)  
Make sure that nitrogen flows freely from all four distribution nozzles in the center of the aft cargo compartment ceiling.

 (b)  
Make sure that no nitrogen flows from the three distribution nozzles in the center of the forward cargo compartment ceiling.

 S 865-610
 (8)  
Stop the dry nitrogen source.

 S 425-611

 (9)  
Install the nozzle caps to the distribution nozzles in the AFT cargo compartment ceiling.

 S 785-600

 (10)
 Apply pressure between 50 and 55 psig.

 S 865-601

 (11)
 Stop the pressurization, and observe the pressure decay for ten minutes.

 S 785-602

 (12)
 Make sure the pressure has not decreased by more than 0.5 psig.

 (13)
 Release the pressure from the AFT cargo compartment tubing.

 S 035-604

 (14)
 Remove the nozzle caps from the distribution nozzles in the AFT cargo compartment.

 S 785-603
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 S 035-605
 (15)
 Remove the cap from the bottle 1 discharge hose.

 S 025-606

 (16)
 Disconnect the dry nitrogen source from the AFT discharge hose of bottle 2.

 S 425-385

 (17)
 Connect the AFT discharge hoses to the AFT discharge ports of bottles 1 and 2.

 (a) Tighten the discharge hoses to 280 pound-inches for 1/2-inch connectors and 360 pound-inches for 5/8-inch connectors.
 S 215-373
 (18)
 Make sure the DISCH light in the BTL DISCH 2 switch on the APU/CARGO Fire Control Panel, P8, comes on.

 S 865-485

 (19)
 Push the red reset button on the aft discharge line pressure switch, S10565.

 (a)  Make sure the DISCH light in the BTL DISCH 2 switch on the APU/CARGO Fire Control Panel, P8, goes off.

 (20)
 Put the Airplane back to its initial condition.

 S 865-619
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757 MAINTENANCE MANUAL
 CARGO FIRE EXTINGUISHING SYSTEM TUBING AND NOZZLE OUTLETS - CLEANING
____________________________________________________________________
 1.  General
_______
 A.  This procedure contains a task. This task gives the instructions to clean the cargo fire extinguishing tubing and the nozzle outlets.
 TASK 26-23-00-107-019
 2.  Clean the Cargo Fire Extinguishing Tubing and the Nozzle Outlets
________________________________________________________________
 NOTE: ALL EXCEPT GUN 051;
____ Clean the FWD and AFT Fire Extinguishing Tubing and the Nozzle Outlets
 NOTE: GUN 051;
____ Clean only the FWD Fire Extinguishing Tubing and the Nozzle Outlets
　
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