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.
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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.
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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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