34-11-00
 ALL  ú ú 12 Page 336 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 (o)  
Disconnect the static hoses joined by the MS21916D5-4 reducer.

 (p)  
Install quick-disconnects on the static hoses.

 (q)  
Connect the auxiliary No. 2 static hose to the input of the source select valve.

 (r)  
Connect the center air data computer static hose to the static input of the center air data computer.

 S 413-271
 (7)  In section 48, connect the elevator feel computer to the pitot-static system:
 (a)  
Remove the pressure caps from the pitot and static lines.

 (b)  
Remove the protective caps from the elevator feel computer ports.

 (c)  
Connect the pitot and static lines to the elevator feel computer.

 S 433-222
 CAUTION: PITOT-STATIC PROBES ARE INSTRUMENTS THAT ARE EASILY DAMAGED AND
_______ ARE CAREFULLY ALIGNED ON THE AIRPLANE. THE BEST CARE MUST BE USED WHEN YOU REMOVE, INSTALL OR TOUCH THE PROBES.
 (8)  At STA 270 in the left and right crawlways, connect the lower pitot-static probes (two probes) to the pitot-static system:
 (a)  
Remove the MS21902D6 union near each pitot-static probe's S2 flexible hose.

 (b)  
Replace the red-colored 69B41424-1 orifice union.

 (c)  
Remove the temporary fasteners from the pitot and static hoses.

 (d)  
Remove the pressure caps from the pitot and static hoses.

 (e)  
Remove the protective caps from the pitot and static ports.

 (f)  
Connect the pitot and static hoses to the pitot-static probes.

 S 433-223
 CAUTION: PITOT-STATIC PROBES ARE INSTRUMENTS THAT ARE EASILY DAMAGED AND
_______ ARE CAREFULLY ALIGNED ON THE AIRPLANE. THE BEST CARE MUST BE USED WHEN YOU REMOVE, INSTALL OR TOUCH THE PROBES.
 (9)  At STA 275 on the left and right sides of the main passenger cabin, connect the upper pitot-static probes (two probes) to the pitot-static system:
 (a)  Remove the MS21902D6 union near each pitot-static probe's S2 flexible hose.
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 34-11-00
 ALL  ú ú 08 Page 337 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Replace the red-colored 69B41424-1 orifice union.

 (c)  
Remove the temporary fasteners from the pitot and static hoses.

 (d)  
Remove the pressure caps from the pitot and static hoses.

 (e)  
Remove the protective caps from the pitot and static ports.

 (f)  
Connect the pitot and static hoses to the pitot-static probes.

 S 413-224
 (10)
 Install the sidewall insulation in the area of the upper pitot-static probes (Ref 25-21-04/401).

 S 413-A24

 (11)
 Install the main deck compartment cargo lining panels that were removed to enable access to the upper pitot-static probes (AMM 25-59-01/401).

 S 433-226

 (12)
 At STA 680 on the left and right sides of the forward cargo compartment, connect the alternate static pressure ports (two ports) to the pitot-static system:

 (a)  
Remove the temporary fasteners from the static hoses.

 (b)  
Remove the pressure caps from the static hoses.

 (c)  
Remove the protective caps from the alternate static pressure ports.

 (d)  
Connect the hoses to the alternate static pressure ports.

 S 433-227
 (13) At STA 2367 on the left and right sides of section 48, connect the dedicated static pressure ports (two ports) to the pitot-static system:
 (a)  
Remove the pressure caps from the static lines.

 (b)  
Remove the protective caps from the dedicated static pressure ports.

 (c)  
Connect the lines to the dedicated static pressure ports.

 S 433-228
 (14) At STA 260 in the left and right crawlways, install the drain assemblies (four drains) on the pitot-static system as follows:
 (a)  Remove the plugs from the drain lines.
　
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