34-11-00
 ALL  ú ú 12 Page 329 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 033-175
 (15)
 At STA 270 in the left crawlway, remove the pressure cap from the static hose disconnected from the lower left pitot-static probe, S1 connection.

 S 173-176

 (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 433-177
 (17)
 Replace the pressure cap on the static hose disconnected from the lower left pitot-static probe.

 S 093-258

 (18)
 Remove the air supply from drain line No. 19 and replace the plug.

 N. Flush the Alternate Static System
 S 283-179
 (1)  
Make sure that the left alternate static pressure port, right alternate static pressure port, standby altimeter, standby airspeed indicator, and all of the drain assemblies are disconnected from alternate static system.

 S 493-259

 (2)  
At STA 400 in the left crawlway, remove the plug from drain line No. 11 (Fig. 301) and connect the air supply.

 S 033-181

 (3)  
On the flight deck, remove the pressure cap from the static hose disconnected from the standby altimeter.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 06 Page 330 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 173-182
 (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.

 S 433-183
 (5)  
Replace the pressure cap on the static hose disconnected from the standby altimeter.

 S 033-184

 (6)  
On the flight deck, remove the pressure cap from the static hose disconnected from the standby airspeed indicator.

 S 173-185

 (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 433-186
 (8)  
Replace the pressure cap on the static line disconnected from the standby airspeed indicator.

 S 033-187

 (9)  
At STA 740 on the left side of the forward cargo compartment, remove the plug from drain line No. 23 (Fig. 301).

 S 173-188

 (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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 12 Page 331 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 433-189
 (11)
 Replace the plug on drain line No. 23.

 S 033-190

 (12)
 At STA 680 on the left side of the forward cargo compartment, remove the pressure cap from the static hose disconnected from the left alternate static pressure port.

 S 173-191

 (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
　
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