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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 08 Page 326 ú Jun 10/96
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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