(7)
After you have installed all of the tools go out of the main tank.
S 486-298
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A
747-400 MAINTENANCE MANUAL
J. Prepare the Inboard Main Tank (No. 2 or 3) for the Pressure Check (Table 604)
S 016-377
(1)
Open the applicable No. 2 or 3 main tank access doors
(AMM 28-11-02/401):
(a)
No. 2 main tank:
1) 544AB
2) 545BB
(b)
No. 3 main tank:
1) 644AB
2) 645BB
S 016-378
(2)
Install tooling in the inboard vent line (View K):
(a)
Go into the main tank through the applicable access door: 1) 544AB No. 2 main tank 2) 644AB No. 3 main tank
(b)
Go inboard and forward of the mid spar to the vent line (WS 280, WBL 145). 1) Remove the coupling from the vent line. 2) Install a G28019-19 vent plug into the aft section of the
vent tube.
(c)
Go inboard and aft of the mid spar to the vent line (WS 323, WBL 145). 1) Install a G28019-5 stopper into the bottom of the drain
valve.
S 486-379
(3)
AIRPLANES WITH A HYDROMECHANICAL FUEL SCAVENGE SYSTEM; Install tooling in the scavenge system float valve, aft of the mid spar (View L):
(a)
Go into the main tank through the applicable access door: 1) 544AB No. 2 main tank 2) 644AB No. 3 main tank
(b)
Go inboard and aft of the mid spar (WS 330, WBL 50).
(c)
Install a G28019-4 float clamp assembly (sponge) on top of the fuel scavenge system float valve.
S 486-380
(4)
Install tooling in the outboard vent line (View H):
(a)
Go into the main tank through the applicable access door: 1) 545BB No. 2 main tank 2) 645BB No. 3 main tank
(b)
Go forward through the mid spar access hole (WS 680, WBL 470).
(c)
Install a G28019-4 float clamp (sponge) on top of each float valve (two locations).
(d)
Install a G28019-5 stopper into the bottom of the drain valve (WS 690, WBL 470)(View E).
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28-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 486-381
(5)
Install tooling in the channel float valves (View I):
(a)
Go into the main tank through the applicable access door: 1) 545BB No. 2 main tank 2) 645BB No. 3 main tank
(b)
Go aft of the mid spar to the outboard tank end (LWS 733, RWS 741).
(c)
Install a G28019-4 float clamp (sponge) on top of each float valve (two locations).
(d)
Install a G28019-5 stopper into the bottom of each drain valve (two locations).
S 486-382
(6)
Install tooling in the drain valve (View E):
(a)
Go into the main tank through the applicable access door: 1) 545BB No. 2 main tank 2) 645BB No. 3 main tank
(b)
Go outboard and aft of the mid spar to the outboard tank end (WS 760, WBL 470).
(c)
Install a G28019-5 stopper into the drain valve.
S 866-383
(7) After you have installed all of the tools go out of the fuel tank.
~.............................................................................. | | | WING FUEL TANK | | QTY | | TOOL NUMBER | NOMENCLATURE | ACCESS DOOR | LOCATION | (PER TANK) | ................................................................................ |F72951-1 |U-TUBE WATER | N/A |ALL TANKS | 1 | | |MANOMETER | | | | ................................................................................ |G28019-18 |PRESSURE TEST | AS NECESSARY |FUEL TANK | 1 | | |DOOR | |UNDER TEST | | ................................................................................
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