H28946
Safety Relief Valve Installation 500
21-32-22 Figure 401 May 01/74
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PRESSURE EQUALIZATION VALVES - REMOVAL/INSTALLATION
1. General
A. A pressure equalization valve is installed in the aft bulkhead of each cargo compartment. The valves are similar but, because of slight differences in their spacer rings, are not interchangeable. The following removal and installation procedures are written to apply to both valves, taking into account the relevant differences in the procedures for each.
B. In the forward cargo compartment the pressure equalization valve is installed on the right-hand aft bulkhead panel and is removed from this panel after the panel is removed. In the aft cargo compartment, removal of the aft bulkhead center access panel gives access to attachment hardware of the pressure equalization valve which is mounted on left-hand bulkhead panel.
2. Remove Cargo Compartment Pressure Equalization Valve (See figure 401.)
A. Remove bulkhead panels as follows:
(1)
In forward cargo compartment, disengage quick-release fasteners around periphery of right-hand aft bulkhead panel and remove panel complete with pressure equalization valve.
(2)
In aft cargo compartment, remove aft bulkhead center access panel by disengaging quick-release fasteners around periphery of panel.
B. Remove screws attaching bulkhead grille and remove grille.
C. Remove screws retaining valve to bulkhead panel.
D. Remove valve from bulkhead panel.
501
Aug 15/68 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-32-31 Page 401
H28953 H28950
Pressure Equalization Valves Installation 500
21-32-31 Figure 401 (Sheet 1) Aug 15/68
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Pressure Equalization Valves Installation
Aug 15/68 Figure 401 (Sheet 2) 21-32-31
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Install Cargo Compartment Pressure Equalization Valves (See figure 401.)
A. Check that seals are bonded to panel assembly. Replace if necessary. (Seals are bonded to panel assembly only.)
B. Position valve on aft side of bulkhead panel and spacer ring on the forward side and install screws, washers and nuts (11 places).
C. Position bulkhead grille on forward side of bulkhead panel and install screws (11 places).
NOTE: Check that gasket is bonded to grille.
D. Install bulkhead panels as follows:
(1)
In forward cargo compartment position right-hand aft bulkhead panel, complete with pressure equalization valve, and engage quick-release fasteners around periphery of panel.
(2)
In aft cargo compartment position center bulkhead access panel and engage quick-release fasteners around periphery of panel.
500
21-32-31 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/68
CEILING BLOWOUT PANELS - REMOVAL/INSTALLATION
1. General
A. One blowout panel is provided in the ceiling of each cargo compartment. Each blowout panel has the words, "Controlled Pressure Relief Panel," stenciled on the surface facing into the cargo compartment.
B. The removal/installation of each blowout panel is similar; therefore both blowout panels will be covered by the same procedure. Access for maintenance is from inside the cargo compartment.
2. Remove Cargo Compartment Ceiling Blowout Panel
A. Remove cap strips where length of cap strip approximates the matching blowout panel dimension. It is not necessary to completely remove cap strips when they are long. The long cap strips may be loosened in the area of the blowout panel to allow panel removal. (See figure 401.)
NOTE: To facilitate reinstalling blowout panel, mark edge of the cap strip on blowout panel on all sides. When installing blowout panel these lines will aid positioning blowout panel at correct edge engagement with the cap strip.
B. Remove blowout panel from ceiling.
500
Aug 15/68 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-32-41 Page 401
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