S 173-053

 (16)
 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 433-054
 (17)
 Replace the pressure cap on the pitot hose disconnected from the upper right pitot-static probe.

 S 093-246

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

 H. Flush the Auxiliary No. 1 Pitot System
 S 283-056
 (1)  
Make sure that the lower left pitot-static probe, the standby airspeed indicator, the elevator feel computer, and all of the drain assemblies are disconnected from the auxiliary No. 1 pitot system.

 S 493-247

 (2)  
At STA 400 in the left crawlway, remove the plug from drain line No. 12 (Fig. 301) and connect the air supply.

 S 033-058

 (3)  
At STA 270 in the left crawlway, remove the pressure cap from the pitot hose disconnected from the lower left pitot-static probe, PT connection.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 173-059
 (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 433-060
 (5)  
Replace the pressure cap on the pitot hose disconnected from the lower left pitot-static probe.

 S 033-061

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

 S 173-062

 (7)  
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 433-063
 (8)  
Replace the pressure cap on the pitot hose disconnected from the standby airspeed indicator.

 S 033-064

 (9)  
At STA 740 on the left side of the forward cargo compartment, remove the plug from drain line No. 25 (Fig. 301).

 S 173-065

 (10)
 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

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A
747-400 MAINTENANCE MANUAL
 S 433-066
 (11)
 Replace the plug on drain line No. 25.

 S 033-067

 (12)
 At STA 1980 on the right side of bulk cargo compartment, remove the plug from drain line No. 27 (Fig. 301).

 S 173-068

 (13)
 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 433-069
 (14)
 Replace the plug on drain line No. 27.

 S 033-070

 (15)
 In section 48, remove the plug from drain line No. 30 (Fig. 301).

 S 173-071

 (16)
 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 433-072
 (17)
 Replace the plug on drain line No. 30.

 S 033-073

 (18)
 In section 48, remove the pressure cap from the pitot line disconnected from the left side pitot port of the elevator feel computer.
　
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