S 173-031
(7)
Flush from the air supply through 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 line is not cross connected.
S 433-032
(8)
Replace the plug on drain line No. 10.
S 033-033
(9)
At STA 275 on the left side of main passenger cabin, remove the pressure cap from the pitot hose disconnected from the upper left pitot-static probe, PT connection.
S 173-034
(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 line is not cross connected.
S 433-035
(11)
Replace the pressure cap on the pitot hose disconnected from the upper left pitot-static probe.
S 093-244
(12)
Remove the air supply from drain line No. 16 and replace the plug.
G. Flush the First Officer's Pitot System
S 283-340
(1)
Make sure that the upper right pitot-static probe, the right and center air data computers, the source select valve, and all of the drain assemblies are disconnected from the first officer's pitot system.
S 493-245
(2)
In the electrical and electronics compartment, remove the plug from drain line No. 18 (Fig. 301) and connect the air supply.
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S 033-040
(3) In the electrical and electronics compartment, remove the pressure
cap from pitot hoses joined by the MS21916D5-4 reducer.
S 173-041
(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 433-042
(5)
Replace the pressure cap on the pitot hoses joined by the MS21916D5-4 reducer.
S 033-043
(6)
In the electrical and electronics compartment, remove the plug from drain line No. 22 (Fig. 301).
S 173-044
(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 433-045
(8)
Replace the plug on drain line No. 22.
S 033-046
(9)
In the electrical and electronics compartment, remove the pressure cap from the pitot hose disconnected from the right air data computer.
S 173-047
(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.
S 433-048
(11) Replace the pressure cap on the pitot hose disconnected from the right air data computer.
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747-400 MAINTENANCE MANUAL
S 033-049
(12)
At STA 400 in the right crawlway, remove the plug from drain line No. 5 (Fig. 301).
S 173-050
(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 433-051
(14)
Replace the plug on drain line No. 5.
S 033-052
(15)
At STA 275 on the right side of main passenger cabin, remove the pressure cap from the pitot hose disconnected from the upper right pitot-static probe, PT connection.
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