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28-11-21
ALL ú ú 01 Page 404 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CENTER TANK ACCESS PANEL - REMOVAL/INSTALLATION
_______________________________________________
1. General_______
A. This procedure has two tasks:
(1)
A task to remove the access panel for the center tank
(2)
A task to install the access panel for the center tank.
B. An access panel for the center fuel tank lets persons go into the center tank for maintenance. The access opening is in the skin on the bottom of the fuselage (Fig. 401).
C. The tank access panel is cast aluminum. It supplies a primary seal which fluids cannot go through. The access panel has a rubber seal installed in a groove on the panel mating surface. A phenolic strip is installed on the outer edge of the panel to prevent damage to the wing skin by friction.
D. A clamp ring is used to divide the load equally on the bolts which attach the panel. The clamp ring also gives protection to the outer edge of the skin opening. A bonding jumper electrically grounds the panel to the structure.
E. A layer of sealant on the heads of all the bolts supplies a secondary seal. A thin layer of sealant around the inner and the outer edges of the clamp ring also supplies a secondary sealant. You apply this sealant during each installation of the access panels.
F. The access panel must have a seal which fuel cannot go through to prevent some fuel leakage on the air conditioning equipment. Some fuel leakage around the clamp ring shows a failure of the primary and the secondary seals. You must repair this leakage immediately.
TASK 28-11-31-004-001
2. Center Tank Access Panel Removal (Fig. 401)________________________________
A. Equipment
(1)
Tools - sealant removal, cutting, and fairing
(2)
Cover - rubber, for protection of the access panel opening
(3)
Mallet - rubber
B. References
(1)
AMM 21-00-00, Air Conditioning
(2)
AMM 28-10-00/201, Fuel Storage
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28-11-31
ALL ú ú 02 Page 401 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CENTER TANK
ACCESS PANEL
SEE A
A B
ACCESS
PANEL
B
A LOWER CENTER
BONDING WING
JUMPER PANEL
SEE B
CLAMP
RING
WASHER
BOLT
A
PHENOLIC
PHENOLIC
STRIPS
STRIPS
CLAMP
RING
MOLDED RUBBER SEAL WING SKIN
A-A
CLAMP
PANEL RING
ACCESS WING SKIN
FILL CAVITY AND APPLY CONTINUOUS FILLET OF SEALANT AROUND INNER
APPLY CONTINUOUS EDGE OF CLAMP RING
FILLET SEAL AROUND OUTER EDGE OF CLAMP RING
APPLY SEALANT OVER
AND AROUND PANEL
ATTACHING BOLT
(23 PLACES)
BMS 5-26, CLASS B SEALANT APPLICATION
B-B
BONDING JUMPER
ACCESS PANEL
B
Center Tank Access Panel Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-11-31
ALL ú ú 01 Page 402 ú Jun 25/84
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