SYSTEM B HYDRAULIC RETURN FILTER - REMOVAL/INSTALLATION
1. General
A. A container will be necessary to catch fluid from disconnected hydraulic lines. Should any fluid spill on the airplane, decontaminate. Refer to Chapter 12, Cleaning and Washing.
2. Equipment and Materials
A. Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid - BMS\3-11
3. Remove Return Filter
A. Depressurize hydraulic system B. Refer to 29-12-0, Hydraulic System B - MP.
B. Depressurize system B reservoir. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - MP.
C. Open system B pump circuit breakers on P6-11 and P6-12 panels.
D. Remove hydraulic lines from filter head (Fig. 401) and install protective covers.
E. Remove filter mounting bolts and remove filter.
4. Install Return Filter
A. Install union and O-ring in ports 1, 3 and 5 (Fig. 401). Lubricate with assembly lube or hydraulic fluid.
B. Check that plugs in ports 2 and 4 are tight and lockwired.
C. Check that filter bowl is tight and lockwired.
D. Position filter on mounting bracket and install mounting bolts (Fig.\401).
E. Connect hydraulic lines to filter.
CAUTION: DURING INSTALLATION, IT IS IMPERATIVE THAT EXTREME CARE BE TAKEN TO PREVENT IMPURITIES FROM ENTERING THE SYSTEM.
F. Pressurize hydraulic reservoirs (Ref 29-09-300).
G. Pressurize hydraulic system B and check filter and connections for leaks (Ref 29-12-0 .
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-12-81 Page 401
F87644
System B Hydraulic Return Filter Installation 500
29-12-81 Figure 401 Aug 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SYSTEM B HYDRAULIC FLUID HEAT EXCHANGER - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes with 65-44571-XX Heat Exchanger
1. General
A. The heat exchanger for hydraulic system B is installed in the bottom of No. 2 fuel tank. A container will be necessary to catch any fluid when removing the heat exchanger. Should any fluid spill on the airplane, the affected area must be decontaminated (Ref Chapter 12, Cleaning and Washing).
B. Removal and installation of the heat exchanger requires entry into the No. 2 fuel tank. Refer to Chapter 28, Fuel Storage System, for precautionary measures and procedures before attempting removal or installation of the heat exchanger.
2. Equipment and Materials
A. Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid -BMS3-11
3. Remove System B Hydraulic Fluid Heat Exchanger
A. Depressurize hydraulic system B (Ref 29-12-0,MP).
B. Depressurize hydraulic reservoirs (Ref 29-09-300 MP).
C. Defuel fuel tank No. 2 and remove fuel tank access panel just forward of heat exchanger (Ref Chapter 28, Fuel Storage System).
D. At the aft side of the rear spar (Fig. 401) where heat exchanger inlet and outlet lines pass through, disconnect hydraulic fittings (1). Remove and cap hydraulic lines.
E. Remove unions (6), bulkhead nuts (7) and washers (8).
F. Prepare fuel tank for entering to remove heat exchanger.
WARNING: FUEL TANK IS HAZARDOUS AREA (REF CHAPTER 28, FUEL STORAGE SYSTEM). KNOW PRECAUTIONS BEFORE ENTERING FUEL TANK.
G. Remove electrical bonding jumper (2) from tubing coil (4).
H. Remove heat exchanger mounting bolts (3) and (5).
I. Loosen heat exchanger fittings from rear spar.
NOTE: O-rings may cause fittings to stick to spar.
J. Remove heat exchanger through tank access opening.
CAUTION: ENSURE ALL PARTS, TOOLS AND FOREIGN MATERIALS ARE REMOVED BEFORE LEAVING FUEL TANK.
Feb 20/85 29-12-91 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
F87655
System B Hydraulic Fluid Exchanger Installation 500
29-12-91 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Install System B Hydraulic Fluid Heat Exchanger
A. Insert O-rings (10) in grooves of heat exchanger fittings (Fig. 401).
B. Pass heat exchanger through wing tank access opening with the inlet and outlet ports going through opening first.
WARNING: FUEL TANK IS HAZARDOUS AREA (REF CHAPTER 28, FUEL STORAGE SYSTEM). KNOW PRECAUTIONS BEFORE ENTERING TANK.
C. Enter fuel tank and position inlet and outlet fittings so they enter the holes in rear spar.
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