Center Tank Access Panel 500
28-11-31Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 1/73
C. Using sealant cutting and removal tools, strip coating and fillets of sealant material from heads of panel attaching bolts and edges of clamp ring.
D. Remove access panel mounting bolts, washers and clamp ring.
E. Push up on panel to break seal, tip panel and guide through opening. Disconnect bonding jumper from panel.
CAUTION: DO NOT PRY OFF PANEL. IF PANEL STICKS, LOOSEN BY TAPPING AROUND EDGE WITH RUBER MALLET. PRYING MAY DAMAGE CRITICAL SEALING SURFACES.
F. Install rubber protectors around access panel opening.
CAUTION: PROTECT SEAL SURFACE EDGE OF ACCESS OPENING BEFORE ENTRY IS MADE INTO CAVITY OR CELL. DAMAGE TO A CRITICAL SEALING SURFACE MAY RESULT FROM CONTACT WITH TOOLS AND EQUIPMENT IF EDGE IS LEFT UNPROTECTED.
4. Prepare Fuel Tank For Access Panel Installation
A. Check open tank for foreign material such as tools, metal cuttings, and any other debris.
B. Clean open tank, as necessary, then proceed with access panel installation.
5. Install Center Tank Access Panel (Fig. 401)
A. Remove rubber protector from access panel opening.
B. Remove any remaining sealant and thoroughly clean edge margin of access panel opening and access panel sealing surfaces using a clean, lint-free cloth moistened with MEK solvent.
WARNING: METHYL ETHYL KETONE IS TOXIC. USE ONLY IN WELL VENTILATED AREA.
C. Clean clamp ring using clean, lint-free cloth moistened with MEK solvent.
D. Check access panel for serviceability of phenolic strips and molded seal ring. Replace panel if condition is poor or doubtful.
CAUTION: DO NOT APPLY CEMENTS OR SEALERS OF ANY KIND TO RUBBER SEAL OR SEALING SURFACES.
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Feb 1/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-11-31 Page 403
E. Connect bonding jumper to access panel, tilt panel through opening and align with bolt holes.
F. Position clamp ring and install bolts and washers. Tighten bolts evenly to 30-40 pound-inches.
G. Check electrical bond between access panel and airplane structure per 20-22-01 I/C. Resistance shall not exceed 0.010 ohm.
H. Fill center wing tank with fuel and ensure that there is no leakage at access panel.
I. Apply BMS 5-26 sealant material over panel attaching bolts and as fillet around inner and outer edges of clamp ring (Ref 28-11-0 AR).
J. Reinstall any air conditioning equipment removed to gain access to center tank access panel (Ref Chapter 21).
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28-11-31 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/84
INTEGRAL CENTER TANK SUMP DRAIN ASSEMBLY AND SUMP
DRAIN VALVE - REMOVAL/INSTALLATION
1. General
A. The sump drain valve is a spring-loaded, flapper type check valve which is installed inside the center tank at the lower center of the second bay. The valve seat is part of the upper housing (see figure 401) and is not readily removable as the adhesive between the mounting flange sealing surfaces must be stripped to remove the upper housing.
B. The drain assembly, including the spring-loaded plunger, is removable from outside the airplane in the body keel beam area. The valve and drain assembly may be removed and installed separately; however, the drain assembly should be removed to leak check the valve after valve installation.
2. Equipment and Materials
A. Petrolatum - VV-P-236
B. Bonding meter (Ref 20-22-01 I/C)
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