EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 11 Page 316 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 173-074
 (19) 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 433-075
 (20)
 Replace the pressure cap on the pitot line disconnected from the left side pitot port of the elevator feel comptuer.

 S 093-248

 (21)
 Remove air supply from the drain line No. 12 and replthe ace plug.

 I. Flush the Auxiliary No. 2 Pitot System
 S 283-341
 (1)  
Make sure that the lower right pitot-static probe, source select valve, the elevator feel computer, and all of the drain assemblies are disconnected from the auxiliary No. 2 pitot system.

 S 493-249

 (2)  
In the electrical and electronics compartment, remove the plug from drain line No. 21 (Fig. 301) and connect the air supply.

 S 013-342

 (3)  
In the electrical and electronics compartment, remove the pressure cap from the hose disconnected from the source select valve.

 S 413-845

 (4)  
Replace the pressure cap on the hose disconnected from the source select valve.

 S 033-083

 (5)  
At STA 400 in the right crawlway, remove the plug from drain line No. 8 (Fig. 301).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 05 Page 317 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 173-084
 (6)  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 433-085
 (7)  
Replace the plug on drain line No. 8.

 S 033-086

 (8)  
At STA 270 in the right crawlway, remove the pressure cap from the pitot hose disconnected from the lower right pitot-static probe, PT connection.

 S 173-087

 (9)  
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 433-088
 (10)
 Replace the pressure cap on the pitot hose disconnected from the lower right pitot-static probe.

 S 033-089

 (11)
 At STA 400 in the left crawlway, remove the plug from drain line No. 14 (Fig. 301).

 S 173-090

 (12)
 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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 07 Page 318 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 433-091
 (13)
 Replace the plug on drain line No. 14.

 S 033-092

 (14)
 At STA 740 on the left side of the forward cargo compartment, remove the plug from drain line No. 24 (Fig. 301).

 S 173-093

 (15)
 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.
　
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