S 024-015
(7)
Remove the electrical connectors.
S 024-016
(8)
Remove the three mounting screws and remove the valve pack.
TASK 29-11-26-424-002
3. Pneumatic Solenoid Valve Pack installation (Fig. 401)
__________________________________________
A. Special Tools and Equipment
(1)
Antiseize Compound - TT-A-580 (Ref 20-30-03)
B.
References
(1)
AMM 36-00-00/201, Pneumatic System
(2)
AMM 54-62-00/201, Nacelle Strut Access Panels
(3)
IPC 29-11-41 Fig. 1
(4)
Location Zone
454 System 1 - Strut Aft Fairing
484 System 4 - Strut Aft Fairing
(5)
Access Panel 454A Trailing Edge Fairing Door, LH - System 1 484A Trailing Edge Fairing Door, LH - System 4
C.
Procedure
S 424-003
(1)
Install fittings with O-rings in pneumatic solenoid valve ports if not included. Lubricate O-rings and threads with antiseize or thread lubricating compound prior to installation.
S 424-004
(2)
Position pneumatic solenoid valve pack on mounting pad and install mounting screws.
(3)
Secure solenoid lead wires with clamp and tighten clamp bolt.
(4)
Attach electrical connectors.
S 424-006
(5)
Connect control air pressure lines to inlet and outlet ports of valve pack manifold block.
S 424-011
S 424-005
NOTE: If solenoid valve pack has been removed from a different air
____ drive configuration, it may be necessary to reclock the T-fitting before connecting lines.
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29-11-26
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
(6) S 864-007On the P5 panel remove tag and position the HYD DEMAND PUMPS switch to the AUTO position
(7) S 714-008Perform the air-driven pump operational test (AMM 29-11-17/501).
(8) S 414-009Check that wire bundles are retied or clamped same as found.
(9) S 414-010Close trailing edge fairing doors (AMM 54-62-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
RETURN MODULE - MAINTENANCE PRACTICES
_____________________________________
1. General_______
A. This procedure contains these tasks:
(1)
Return Module Removal
(2)
Return Module Installation
(3)
Return Filter Element Removal
(4)
Return Filter Element Installation
(5)
Differential Pressure Indicator Removal
(6)
Differential Pressure Indicator Installation
(7)
Ground Service Disconnect Removal
(8)
Ground Service Disconnect Installation
(9)
Relief and Differential Pressure Valve Removal
(10)
Relief and Differential Pressure Valve Installation.
B.
On systems 1 and 4, it is necessary to open the fairing doors on the trailing edge of the strut to do these tasks.
C.
On systems 2 and 3, you can get access to the return module in the applicable wheel well for the wing landing gear.
TASK 29-11-29-002-001
2. Return Module Removal (Fig. 201)_____________________
A. References
(1)
AMM 09-11-00/201, Towing and Taxiing
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 54-62-00/201, Nacelle Strut Access Panels
(4)
IPC 29-11-29 Fig. 1, 5, and 51
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