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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 033-134
(12)
At STA 260 in the left crawlway, remove the plug from drain line No. 3 (Fig. 301).
S 173-135
(13)
Flush from the air supply through the static line with dry filtered air, 20 to 30 psi, for 2 minutes.
NOTE: Make sure that you can feel air come out of the line to show
____
that the line is not cross connected.
S 433-136
(14)
Replace the plug on drain line No. 3.
S 033-137
(15)
At STA 270 in the left crawlway, remove the pressure cap from the static hose disconnected from the lower left pitot-static probe, S2 connection.
S 173-138
(16)
Flush from the air supply through the static line with dry filtered air, 20 to 30 psi, for 2 minutes.
NOTE: Make sure that you can feel air come out of the line to show
____
that the line is not cross connected.
S 433-139
(17)
Replace the pressure cap on the static hose disconnected from the lower left pitot-static probe.
(18)
Remove the air supply from drain line No. 20 and replace the plug.
S 093-254
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
L. Flush the Auxiliary No. 1 Static System
S 283-343
(1)
Make sure that the upper left pitot-static probe, the lower right pitot-static probe, the source select valve, and all of the drain assemblies are disconnected from auxiliary No. 1 static system.
S 493-255
(2)
In the electrical and electronics compartment, remove the plug from drain line No. 15 (Fig. 301) and connect the air supply.
S 013-344
(3)
In the electrical and electronics compartment, remove the pressure cap from the static hose disconnected from the source select valve.
S 173-824
(4)
Flush from the air supply through the pitot line with dry filtered air, 20 to 30 psi, for 2 minutes.
NOTE: Make sure that you can feel air come out of the line to show
____
that the line is not cross connected.
S 413-345
(5)
Replace the pressure cap on the static hose disconnected from the source select valve.
S 033-147
(6)
At STA 400 in the left crawlway, remove the plug from drain line No. 13 (Fig. 301).
S 173-148
(7)
Flush from the air supply through the static line with dry filtered air, 20 to 30 psi, for 2 minutes.
NOTE: Make sure that you can feel air come out of the line to show
____
that the line is not cross connected.
S 433-149
(8) Replace the plug on drain line No. 13.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 033-150
(9)
At STA 275 on the left side of the main passenger cabin, remove the pressure cap from the static hose disconnected from the upper left pitot-static probe, S2 connection.
S 173-151
(10)
Flush from the air supply through the static line with dry filtered air, 20 to 30 psi, for 2 minutes.
NOTE: Make sure that you can feel air come out of the line to show
____
that the line is not cross connected.
S 433-152
(11)
Replace the pressure cap on the static hose disconnected from the upper left pitot-static probe.
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