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747-400 MAINTENANCE MANUAL
 (3)  S 435-113Hold behind the jet nozzle, and remove the jam nut installed on the jet nozzle in the ceiling pans in the aft metered tubing at these approximate locations: STA 1563 RBL 6.50 STA 1723 RBL 6.50 STA 1955 RBL 3.75 STA 1983 RBL 3.75.
 (4)  S 035-115Put a nozzle pressure cap on open end of the metered jet nozzle: STA 1723 RBL 6.50 STA 1955 RBL 3.75 STA 1983 RBL 3.75.
 (5)  S 035-176Remove the jet nozzle at STA 1563, RBL 6.50.
 (6)  S 035-185Install the regulator test equipment at the end of the tubing at STA 1563, RBL 6.50 where the jet nozzle is removed.
 (7)  S 485-186Install the jet nozzle at the end of the regulator test equipment.
 (8)  S 035-116Disconnect the hose between the aft discharge port of the bottle C (M7908) (STA 910, RBL 102) and the bulkhead fittings in the aft metered tubing.
 (9)  S 495-187Disconnect the hose between the aft discharge port of the bottle D (M6742) (STA 890, RBL 103) and the bulkhead fitting in the aft metered tubing.
 S 785-290

 (10)
 Connect the dry nitrogen source to the open hose disconnected from the aft discharge port of bottle C.

 S 785-291

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

 S 785-292

 (12)
 Make sure the dry nitrogen flows from the hose that was disconnected from the aft discharge port of bottle D.

 S 785-293

 (13)
 Decrease the pressure to zero psig.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 035-117
 (14) Put a nozzle pressure cap on the open hose (STA 898, RBL 104, WL 174) disconnected from the aft discharge port of bottle D.
 S 485-116
 CAUTION:_______DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
 CAUTION: DO NOT USE DRY FILTERED AIR ON THE METERED HALON DISTRIBUTION
_______ TUBING. ANY CONTAMINANT IN AIR CAN CLOG THE METERED NOZZLES.
 (15)
 Pressurize the aft metered tubing with the dry nitrogen to 325 +/-25 psig.

 S 725-189

 (16)
 Check the connections for the leakage.

 S 785-345

 (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 085-191
 (18)
 Stop the nitrogen flow and remove the regulator test equipment.

 S 085-192

 (19)
 Hold the tubing behind the jet nozzle and install the jet nozzle and the nozzle pressure cap at: STA 1563, RBL 6.50 STA 1723, RBL 6.50 STA 1956, RBL 3.75 STA 1983, RBL 3.75

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

 S 865-272

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

 S 865-193
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747-400 MAINTENANCE MANUAL
 S 735-119
 (22)
 Make sure the pressure is not less than 348 psig after ten minutes.

 S 865-120

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

 S 435-326

 (24)
 Remove the nozzle pressure caps from the jet nozzles and install the jam nuts: STA 1563 RBL 6.50 STA 1723 RBL 6.50 STA 1955 RBL 3.75 STA 1983 RBL 3.75

 S 865-125

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