(10)
 Connect the dry nitrogen source to the open hose (STA 901, RBL 104, WL 174) disconnected from the forward discharge port of bottle C.

 S 785-287

 (11)
 Pressurize the halon distribution tubing to 15 - 50 psig.

 S 785-288

 (12)
 Make sure the dry nitrogen flows freely from the hose disconnected from the forward discharge port of bottle D.

 S 785-289

 (13)
 Decrease the pressure to zero psig.

 S 035-099

 (14)
 Put a nozzle pressure cap on the open hose disconnected from the dis charge port of bottle D.

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747-400 MAINTENANCE MANUAL
 S 485-098
 CAUTION:_______DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
 CAUTION: DO NOT USE DRY FILTERED AIR TO PRESSURIZE THE METERED HALON
_______ DISTRIBUTION TUBING. ANY CONTAMINANT IN AIR CAN CLOG METERED NOZZLES.
 (15)
 Pressurize the forward metered tubing to 325 +/- 25 psig with the dry nitrogen.

 S 725-168

 (16)
 Check the tubing connections for leakage.

 S 785-343

 (17)
 Make sure the downstream pressure on the regulator test gauge is as follows:

 Temperature Pressure
 (F / C)___________ (psig)
 60 / 16 140 +/- 6
 70 / 21 148 +/- 6
 80 / 27 156 +/- 6
 90 / 21 165 +/- 6

 100 / 27 175 +/- 6
 NOTE: The regulator is temperature compensated.
____
 S 085-170
 (18)
 Stop the nitrogen flow and remove the regulator test equipment.

 S 085-171

 (19)
 Hold behind the jet nozzle, and install the jet nozzle and the nozzle pressure cap at STA 743, RBL 6.50 and STA 523, RBL 6.5.

 S 865-270

 (20)
 Pressurize the forward metered tubing to 350 psig with the dry nitrogen.

 S 865-173

 (21)
 Close the nitrogen supply valve to trap the nitrogen in the tubing system.

 (22)
 Make sure the pressure is not less than 348 psig after 10 minutes.

 (23)
 Remove the pressure from the forward metered tubing.

 S 725-174
 S 865-175
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747-400
MAINTENANCE MANUAL

 S 095-176
 (24)
 Remove the nozzle pressure caps from the jet nozzles and install the jamnuts: STA 523, RBL 6.50 STA 743, RBL 6.50.

 S 865-100

 (25)
 Pressurize the forward metered tubing to 300 to 350 psig with the dry nitrogen.

 S 735-106

 (26)
 Make sure the nitrogen flows out of the forward compartment jet nozzles: STA 523 RBL 6.50 STA 743 RBL 6.50

 S 735-177

 (27)
 Make sure the dry nitrogen does not flow out of the jet nozzles in the aft cargo compartment.

 S 865-107

 (28)
 Remove the pressure from the forward metered tubing.

 S 085-108

 (29)
 Disconnect the nitrogen source from the hose which leads to the forward metered tubing.

 S 435-109

 (30)
 Remove the nozzle pressure cap from the hose which leads to the forward metered tubing.

 S 435-178

 (31)
 Connect and tighten the hose to the forward discharge port of bottle D.

 S 415-179

 (32)
 Install the cargo liner at the jet nozzles.

 G.
Aft Metered Discharge Line Test (Fig. 501)

 S 215-111
 (1)  
Visually make sure all halon distribution tubings from the halon bottle shelf to the lower cargo compartment are not loosely connected or disconnected.

 (2)  
Remove the cargo liner to get access behind the jet nozzle.

 S 015-180
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