(3)  
AIRPLANES WITH METERED CARGO FIRE EXTINGUISHING SYSTEM; Regulated source of dry nitrogen (Capable of supplying 100 psig)

 -for the metered discharge lines
 B. Access
 (1)  
Location Zones
 121 Forward Cargo Compartment (Left)
 122 Forward Cargo Compartment (Right)
 153 Aft Cargo Compartment (Left)
 154 Aft Cargo Compartment (Right)

 (2)  
Access Panels
 821 Forward Cargo Compartment Door
 822 Aft Cargo Compartment Door

 C. Prepare For Test
 S 865-274
 (1)  Make sure these circuit breakers on the main power distribution panel, P6, are closed:
 (a)  
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (b)  
6H6, FIRE EXTINGUISHING CARGO BTL 2.

 D. Test Forward Discharge Line
 S 025-275
 (1)  
Disconnect the FWD discharge hoses from the FWD discharge ports of bottle 1 and bottle 2.

 (2)
Connect the dry air source to the FWD discharge hose of bottle 1.

 S 485-276
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MAINTENANCE MANUAL

 S 785-504
 CAUTION:_______APPLY PRESSURE ONLY TO TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
 (3)  Start the dry air source and apply pressure between 145 psig minimum and 155 psig maximum to the forward cargo compartment.
 (a)  Make sure that air flows freely from the FWD discharge hose of bottle 2.
 S 865-279
 (4)  
Stop the dry air source.

 S 435-280

 (5)  
Cap the FWD discharge hose of bottle 2 with a suitable cap.

 S 785-281
 CAUTION:_______APPLY PRESSURE ONLY TO TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
 (6)  Start the dry air source and apply pressure between 145 psig minimum and 155 psig maximum to the forward cargo compartment. (a) Make sure that air flows freely from all three distribution nozzles in the center of the forward cargo compartment ceiling. (b) Make sure that no air flows from the four distribution nozzles in the center of the aft cargo compartment ceiling.
 (7)  S 865-285Stop the dry air source.
 (8)  S 425-393Install the nozzle caps to the distribution nozzles in the FWD cargo compartment ceiling.
 (9)  S 785-394Apply pressure of 50 +/- 5 psig to the tubing.
 S 865-395

 (10)
 Stop the pressurization, and observe the pressure decay for ten minutes.

 S 785-396

 (11)
 Make sure the pressure has not decreased by more than 0.5 psig.

 S 785-397

 (12)
 Release the pressure from the FWD cargo compartment tubing.

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757 MAINTENANCE MANUAL
 S 035-398
 (13)
 Remove the nozzle caps from the distribution nozzles in the FWD cargo compartment.

 S 985-286

 (14)
 Disconnect the dry air source from the FWD discharge hose of bottle

 1.
 S 035-287
 (15)
 Remove the cap from the bottle 2 discharge hose.

 S 425-288

 (16)
 Connect the FWD discharge hoses to the FWD 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 215-409
 (17) Do these steps:
 (a)  
Make sure the DISCH light in the BTL 1 DISCH switch on the APU/CARGO Fire Control Panel, P8, is on.

 (b)  
Make sure the red reset button on the forward discharge line pressure switch, S633, is extended.

 (c)  
Push the red reset button on the forward discharge line pressure switch, S633. 1) Make sure the DISCH light in the BTL 1 DISCH switch on the
　
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