F15194 F86249 F86321
Reservoir Pressurization System Components Location  534 
29-09-300  Figure 1 (Sheet 1)  Jun 20/93 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

536  Reservoir Pressurization System Components Location 
Jun 20/93  Figure 1 (Sheet 2)  29-09-300 
Page 3 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Reservoir Pressurization System Components Location  500 
29-09-300  Figure 1 (Sheet 3)  May 15/67 
Page 4 
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4.  Vent Filter
A.  The vent filter removes foreign material from ambient air entering the air pressure regulator through the vent line for system A reservoir vacuum relief. The filter consists of a filter head, noncleanable element and a filter bowl. The filter is installed at the vent inlet of the air pressure regulator on the upper surface of the main wheel well (Fig. 1).
5.  Air Pressure Filter
A.  The air pressure filter removes foreign material from engine bleed air entering the air pressure regulator. The filter consists of a filter head, nonclogging metal cleanable element and a filter bowl. The filter is installed next to the regulator on the upper surface of the wheel well area (Fig. 1).
6.  Check Valves and Restrictors
A.  Check valves.
(1)  A check valve is installed in the ground air charging (test) valve line and in each engine bleed line to prevent reverse flow. The direction of flow is shown by an arrow on the valve body.
B.  Restrictors
(1)  A fixed restrictor is installed in each engine bleed line upstream of each check valve to limit maximum airflow in case of air pressure regulator malfunction.
7.  Relief Valve
A.  A relief valve connected to the air manifold (Fig. 1) prevents the reservoir from being damaged by overpressurization. The relief valve is set to relieve between 60 and 65 psi, and has a maximum flow of about 20 gpm. The valve is designed to reset at 90% of the relieving pressure.
8.  Reservoir Air Bleed Valve (Fig. 1)
A.  A reservoir air bleed valve is installed on the air manifold. The connection is used for attaching external air pressure and a gage to check the operation of the air pressure regulator. The valve can be used for pressurizing the reservoir.

9.  Air Manifold (Fig. 1)
A.  An air manifold is installed in the reservoir air pressurization system to manifold the engine bleed air from the engines into one line to the reservoir. The manifold also provides connections for the relief valve, air pressure regulator and filter, ground air charging (test) valve, reservoir air bleed valve, and (on some airplanes) a sump tube and drain fitting or vented cap.
10  Sump Tube and Drain Fitting (Fig. 1) (Not on all airplanes)
A.  A sump tube is installed on the bottom of the air manifold to collect any water condensate from the restrictors and check valves. A drain fitting in installed on the bottom of the sump tube.
11. Vented Cap (Fig. 1)(Not on all airplanes)
A.  A vented cap is installed on the bottom of the manifold to constantly drain any water
condensate from the restrictors, check valves, and vent lines.

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Oct 20/90  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-09-300 Page 5 

HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - MAINTENANCE PRACTICES
1.  General
A.  When testing hydraulic equipment during ground test procedures, the hydraulic reservoir should be pressurized to provide positive fluid flow to the pumps and to maintain a normal operating pressure on the return side of the hydraulic system. Air entering the reservoir via the reservoir air bleed valve is not filtered. Air entering the reservoir via the ground air charging (test) valve is filtered (Fig. 1).
B.  Depressurize reservoirs when maintenance is being performed on the return side of the hydraulic system.
C.  On some airplanes, a vented cap in the pressurization system continuously bleeds air and water accumulation to prevent air pressure lines from freezing.
D.  On some airplanes, a check valve in the air pressurization system prevents air pressure from bleeding from the reservoir when the pressurization system is inactive. The air bleed valve will allow the reservoir to be depressurized.
E.  Should fluid spill on the airplane, decontaminate (Ref 12-40-0).
2.  Pressurize Hydraulic Reservoir
　
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