(b)
the surfaces on the access panel that must seal.
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737-300/400/500MAINTENANCE MANUAL
S 114-011
(3) Clean the clamp ring with a clean, lintfree cloth moist with the solvent, Series 93 (AMM 20-30-93/201).
S 214-012
CAUTION: DO NOT APPLY ADHESIVES OR SEALANTS TO THE RUBBER SEAL OR THE
_______ SEAL SURFACES. DAMAGE TO THE RUBBER SEAL AND THE IMPORTANT SEAL SURFACES CAN OCCUR.
(4) Examine the access panel to see if the phenolic strips and the rubber seal ring are serviceable.
(a) If the condition of these parts is bad or if you are not sure of their condition, replace the panel or replace the rubber seal ring.
NOTE: You can replace the rubber seal ring on all high
____ impact-resistant access doors and all new replacement access doors (AMM 28-11-11/801).
S 434-013
(5)
Connect the bonding jumper to the access panel.
S 424-014
(6)
Turn the panel through the opening and align it with the bolt holes.
S 434-015
(7)
Put the clamp ring in the correct position and install the bolts and the washers.
S 434-016
(8)
Tighten the bolts to a torque range of 10 to 20 pound-inches more than the run-on torque.
NOTE:____Tighten each bolt with a small turn. Then tighten a different bolt with a small turn until you have the correct torque value for each bolt. The run-on torque is the torque necessary to turn the bolt against the friction of the threads (Fig. 402).
S 284-017
(9) Do a check of the electrical bond between the access panel and the airplane structure (SWPM 20-20-00).
(a) The resistance must not be more than 0.010 ohm.
S 214-018
(10) Fill the center tank with fuel and make sure there is no leakage around the access panel.
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737-300/400/500MAINTENANCE MANUAL
S 394-019
(11)
Apply the sealant material to the bolts that attach the panel (AMM 28-11-00/801).
S 394-020
(12)
Apply the sealant material in a thin layer around the inner and the outer edges of the clamp ring (AMM 28-11-00/801).
S 414-021
(13)
Install the air conditioning equipment that you removed to get access to the access panel for the center tank, if you removed some equipment (Ref Chapter 21).
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A 737-300/400/500MAINTENANCE MANUAL
CENTER TANK SUMP DRAIN ASSEMBLY AND SUMP
________________________________________ DRAIN VALVE - REMOVAL/INSTALLATION
__________________________________
1. General_______
A. The sump drain valve is a flapper type of check valve operated with a spring. It is installed in the center tank at the bottom of the second bay in the center of the bay.
B. The valve seat is part of the upper housing (Fig. 401). It is not easy to remove the seat. You must remove the sealant between the seal surfaces of the mounting flange before you remove the upper housing.
C. The sump drain assemblies can be of two different types, a tool-operated type and a rod-operated type.
(1)
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