(c)
Operate test stand until requirements are complete.
(d)
Disconnect test stand from module and install dust caps.
(e)
Close access panel.
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3. Depressurize Hydraulic System B
A. Shut off source of hydraulic power and open the ground interconnect valve. Wait 5 to 10 minutes to allow system pressure to dissipate through internal leakage to the return system.
B. Depressurize reservoir if return lines are being opened. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - MP.
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HYDRAULIC SYSTEM B - INSPECTION/CHECK
1. Hydraulic System B Check
A. Check Hydraulic System B Tubing
(1) Check hydraulic tubing in the wheel well area for discoloration which indicates overheating of hydraulic fluid.
B. Check Hydraulic System B Filters
(1)
At regular intervals replace or clean system B case drain filter element. During removal, inspect magnetic plug and filter element for contamination.
NOTE: If paper filter element is used, examine for contamination by cutting the element and laying the paper out flat.
(2)
If excessive amount of metal particles are found in the case drain filter proceed with the following steps:
(a)
Remove and overhaul the associated pump.
(b)
Clean case drain filter bowl and replace element. Refer to 29-12-71, System B Hydraulic Pump Case Drain Filter.
(c)
Check system pressure and return filters.
(3)
If sufficient contamination is found in system B pressure and return filter to warrant a pump change, proceed with the following:
(a)
Remove and thoroughly clean filters bowls. Replace with clean elements. Refer to 29-12-41, System B Hydraulic Pressure Filter and 29-12-81, System B Hydraulic Return Filter.
(b)
Disconnect line between hydraulic pump and filter and flush with clean BMS 3-11 hydraulic fluid.
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SYSTEM B HYDRAULIC RESERVOIR - REMOVAL/INSTALLATION
1. General
A. System B reservoir is installed on the forward bulkhead of the right wheel well. Removal of the reservoir requires draining. A small amount of fluid will be drained from system A reservoir through the balance line, therefore a container larger than the quantity of fluid in the system B reservoir will be necessary to catch fluid from the reservoir and disconnected hydraulic lines. Should any fluid spill on the airplane, the affected area must be decontaminated. Refer to Chapter 12, Cleaning and Washing.
2. Equipment and Materials
A. Suitable container for draining hydraulic fluid (approx 4 gal. capacity)
B. Regulated source of nitrogen, 0- to 200-psi maximum pressure
C Skydrol Assembly Lube - MCS352 or Fire Resistant Hydraulic Fluid - BMS 3-11
3. Prepare Hydraulic Reservoir for Removal
A. Depressurize hydraulic systems A and B. Refer to 29-11-0, Hydraulic System A and 29-12-0, hydraulic System B - Maintenance Practices.
B. Depressurize hydraulic reservoirs. Refer to 29-09-300, Hydraulic Reservoir Pressurization System. - Maintenance Practices.
C. Tag hydraulic systems A, B and standby pump switches to prevent operation.
D. Open tire protection screen doors.
E. Open system B reservoir drain valve (8, figure 401) and drain fluid from reservoir.
4. Remove System B Hydraulic Reservoir
A. Disconnect reservoir balance lines (1 and 2, figure 401).
B. Disconnect system return line (5).
C. Disconnect pump supply lines (9) from reservoir at quick-disconnect fittings (10).
D. Install protective covers over fittings and plug disconnected hydraulic lines.
E. Disconnect electrical connector (3) from low level warning switch at top of reservoir.
F. Remove mounting bolts (7) and remove reservoir.
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F87532
System B Hydraulic Reservoir Installation 500
29-12-11 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Prepare Hydraulic Reservoir for Installation
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