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21-21-03
ALL ú ú 01 Page 403 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(c)
Pull the clamps on the adjacent ducts.
(d)
Remove the ground service connector and the seals from the airplane.
NOTE: The seals can be used again. Do not discard them unless
____
they are damaged.
S 034-005
(4) Remove the support clamp.
NOTE: Make a note of the position of the clamp lugs in relation to
____ the ground service connector. The support clamp will be subsequently installed in the same position.
TASK 21-21-03-404-006
3. Install the Ground Service Connector
____________________________________
A. References
(1)
21-00-00/201, Air Conditioning
(2)
IPC 21-21-52 Fig. 1
(3)
IPC 21-21-54 Fig. 1
B. Access
(1)
Location Zone
133 Air Conditioning Equipment Bay, LH
134 Air Conditioning Equipment Bay, RH
(2)
Access Panels
192HR Air Conditioning Access Door
191NL Air Conditioning Access Door
C. Procedure
S 434-007
(1)
Install the support clamp on the ground service connector in the position from which it was removed. Install the nut on the clamp hand-tight.
S 434-008
(2)
Install the seal in the groove of the flange at each end of the ground service connector.
(3)
Install the ground service connector in the duct.
(4)
Attach the support rods to the lugs on the support clamp.
S 824-011
(5)
If it is necessary, turn the ground service connector until the inlet is in a vertical position.
S 424-009
S 434-010
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-21-03
ALL ú ú 01 Page 404 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 434-012
(6)
Tighten the support clamp.
S 824-013
(7)
Make sure the ground service connector is aligned with the adjacent ducts.
S 824-014
(8)
Adjust the support rods to align the ground service connector with the ducts.
S 434-015
(9)
Install the clamps on the duct joints.
S 434-033
(10)
Tighten the clamp nuts to 70 |10 pound-inches (7.91 newton meters).
S 864-016
(11)
Operate the applicable air conditioning pack (Ref 21-00-00/201).
S 794-017
(12)
Do a check for air leaks from around the ground service connector.
(a)
Light leakage and leakage from the drain hole is permitted.
(b)
If the leakage is strong, align the duct joints and tighten the clamps.
S 414-018
(13) Close the access door on the air conditioning bay.
TASK 21-21-03-004-019
4. Remove the Swing Check Valve from the Ground Service Connector______________________________________________________________
A. References
(1)
IPC 21-21-52 Fig. 1
(2)
IPC 21-21-54 Fig. 1
B. Procedure
S 034-020
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