S 033-153

 (12)
 At STA 260 in the right crawlway, remove the plug from drain line No. 2 (Fig. 301).

 S 173-154

 (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 433-155
 (14)
 Replace the plug on drain line No. 2.

 S 033-156

 (15)
 At STA 270 in the right crawlway, remove the pressure cap from the static hose disconnected from the lower right pitot-static probe, S1 connection.

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747-400 MAINTENANCE MANUAL
 S 173-157
 (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 433-158
 (17)
 Replace the pressure cap on the static hose disconnected from the lower right pitot-static probe.

 S 093-256

 (18)
 Remove the air supply from drain line No. 15 and replace the plug.

 M. Flush the Auxiliary No. 2 Static System
 S 283-346
 (1)  
Make sure that the lower left pitot-static probe, the upper right pitot-static probe, the center air data computer, the source select valve, and all of the drain assemblies are disconnected from the auxiliary No. 2 static system.

 S 493-257

 (2)  
In the electrical and electronics compartment, remove the plug from drain line No. 19 (Fig. 301) and connect the air supply.

 S 033-163

 (3)  
In the electrical and electronics compartment, remove the pressure cap from the static hoses joined by the MS21916D5-4 reducer.

 S 173-347

 (4)  
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.

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747-400 MAINTENANCE MANUAL
 S 413-348
 (5)  Replace the pressure cap on the static hoses joined by the
 MS219216D5-4 reducer.
 S 033-166
 (6)  At STA 400 in the right crawlway, remove the plug from drain line
 No. 7 (Fig. 301).
 S 173-167
 (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 433-168
 (8)  
Replace the plug on drain line No. 7.

 S 033-169

 (9)  
At STA 275 on the right side of main passenger cabin, remove the pressure cap from the static hose disconnected from the upper right pitot-static probe, S2 connection.

 S 173-170

 (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 433-171
 (11)
 Replace the pressure cap on the static hose disconnected from the upper right pitot-static probe.

 S 033-172

 (12)
 At STA 260 in the left crawlway, remove the plug from drain line No. 4 (Fig. 301).

 S 173-173

 (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.
　
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