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757
MAINTENANCE MANUAL
Fuel Tank Access Panel Repair
Figure 801
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757
MAINTENANCE MANUAL
S 148-003 CAUTION: DO NOT CAUSE DAMAGE TO THE FINISH WHEN YOU REMOVE THE SEALANT.
_______ TOO MUCH FORCE CAN REMOVE THE PAINT OR PRIMER.
(2)
Remove the remaining sealant from the seal groove with the sealant removal tool.
S 128-004
(3)
Clean the seal carefully before you install it.
(a)
Rub the seal with the sandpaper to remove the parting agent.
NOTE: Rub carefully to make sure that the seal bonds to the
____
groove.
(b)
Remove the unwanted material with the aliphatic naphtha.
(c)
Clean the seal with the aliphatic naphtha and dry it.
S 118-009
WARNING:_______DO NOT GET SOLVENTS IN YOUR MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(4)
Prepare the seal groove.
(a)
Clean the seal groove with a clean wiper moist with solvent, Series 93 (AMM 20-30-93/201).
(b)
Dry the seal groove with the air gun.
(c)
Rub the groove with a wiper lightly moist with solvent, Series 93 (AMM 20-30-93/201).
(d)
Apply BMS 5-26 Class A or Proseal 860 B 1/6 sealant to the full width of the seal groove (AMM 28-11-00/801).
S 428-007
(5) Install the seal and make sure it is tightly against the seal groove in all positions.
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757 MAINTENANCE MANUAL
FUEL TANK VENT SYSTEM - DESCRIPTION/OPERATION
_____________________________________________
1. General (Fig. 1)_______
A. Air and fuel vapors flow in and out of the fuel tanks through the fuel vent system. This prevents excess pressure and vacuum from developing within the fuel tanks. Two parallel vent channels extend into the main and center fuel tanks from the surge tanks. Two stringers attached to the upper wing skin form each hat section channel. The channels open into each surge tank. Two fuel vent float valves are installed to outboard ends of the two vent channels in the main and center fuel tanks. These fuel vent float valves prevent fuel overflow through the channels into the surge tanks during climb and roll maneuvers. Two float-actuated vent valves attach to vent tubes at opposite ends of the two vent channels in the center fuel tank. These float-actuated vent valves prevent fuel overflow through the vent channels into the surge tanks.
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