(f)
Remove the quick disconnects from first officer's pitot hose and the center air data computer pitot hose.
(g)
Connect the center air data computer pitot hose to the first officer's pitot hose.
(h)
Disconnect the auxiliary No. 2 pitot hose from the input to the source select valve.
(i)
Remove the quick disconnect from the auxiliary No. 2 pitot hose.
(j)
Install a pressure cap on the auxiliary No. 2 pitot hose.
(k)
Temporarily attach the hoses to prevent movement.
(l)
Install protective caps on the pitot source select valve ports.
(m)
Disconnect the auxiliary No. 2 static hose from the input to the source select valve (V631).
(n)
Disconnect the center air data computer static hose from the output of the source select valve.
(o)
Remove the quick-disconnects from the auxiliary No. 2 and center air data computer static hoses.
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747-400 MAINTENANCE MANUAL
(p)
Connect the center air data computer static hose to the auxiliary No. 2 static hose.
(q)
Disconnect the auxiliary No. 1 static hose from the input to the source select valve.
(r)
Remove the quick-disconnect from the auxiliary No. 1 static hose.
(s)
Install a pressure cap on the auxiliary No. 1 static hose.
(t)
Temporarily attach the hoses to prevent movement.
(u)
Install protective caps on the source select valve ports.
S 013-242
(8) In section 48, disconnect the elevator feel computer from the pitot-static system:
(a)
Disconnect the pitot and static lines from the elevator feel computer (B169) at STA 2480, WL 315, BL 0.
(b)
Install dust caps on the elevator feel computer ports.
(c)
Install pressure caps on the pitot and static lines.
S 033-014
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 270 in the left and right crawlways, disconnect the lower pitot-static probes (two probes) from the pitot-static system:
(a)
Disconnect the pitot and static hoses from the pitot-static probes.
(b)
Install dust caps on the pitot and static ports.
(c)
Install pressure caps on the pitot and static hoses.
(d)
Temporarily attach the hoses to prevent movement.
(e)
Remove the red-colored 69B41424-1 union near each of the pitot-static probe's S2 flexible hose and replace the hose with an MS21902D6 union.
S 013-A23
(10)
Remove the main deck compartment cargo lining panels to enable access to the upper pitot-static probes (Ref 25-59-01/401).
S 013-016
(11)
Remove the sidewall insulation in the area of upper pitot-static probes (Ref 25-21-04/401).
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S 033-017
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.
(12) At STA 275 on the left and right sides of the main passenger cabin, disconnect the upper pitot-static probes (two probes) from the pitot-static system:
(a)
Disconnect the pitot and static hoses from the pitot-static probes.
(b)
Install dust caps on the pitot and static ports.
(c)
Install pressure caps on the pitot and static hoses.
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