B. Referenced Information
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REFERENCE DESIGNATION
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28-00-00-910-001 Fuel Safety Procedures 28-12-47-000-001 Removal of the NACA Vent Intake (for corrective action) 28-12-47-400-001 Installation of the NACA Vent Intake (for corrective action) 28-12-47-991-003 Fig. 601
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3. Job Set-up
__________
(Ref. Fig. 601/TASK 28-12-47-991-003)
Subtask 28-12-47-941-052
A. Safety Precautions
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
(1) You must obey the fuel safety procedures (Ref. TASK 28-00-00-910-001) when you do work on the fuel system.
(2) Put the safety barriers in position.
Subtask 28-12-47-010-052
B. Get Access
(1) Put the access platform below the applicable access panel 550AB(650AB).
4. Procedure
_________ (Ref. Fig. 601/TASK 28-12-47-991-003) Subtask 28-12-47-210-053 R A. Visual Check of the NACA Intake for Signs of Blockage
(1) Examine the NACA vent door 550AB (650AB) for signs of leaks and damage.
NOTE : (Ref. TASK 28-12-47-000-001) (Ref. TASK 28-12-47-400-001) for
____
corrective action.
(2) Examine the NACA vent intake for contamination and make sure that there is no blockage. If necessary remove the contamination and/or the blockage.
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NACA Vent Intake
Figure 601/TASK 28-12-47-991-003
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5. Close-up
________ Subtask 28-12-47-942-051
A. Removal of Equipment
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Remove the safety barriers.
(3)
Remove the warning notice(s).
(4)
Remove the access platform(s).
(5)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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________________________________________________________________________
1. General_______ The center tank external venting system:
-has a vapor seal membrane that seals the bottom of the center tank from the air conditioning compartment (ZONE 191/192)
-
lets a flow of air to go through the space between the membrane and the bottom of the center tank to air through the drain mast
-
lets fuel drain to air through the drain mast.
2. Component Location__________________ (Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------500QM MONITOR-LEAK 141 195CB 28-13-44
3. System Description__________________ (Ref. Fig. 001) The system has:
-
a vapor seal
-
a ventilating air supply pipeline
-
a drainage line The vapor seal is a fabric membrane that isolates the center tank from the air conditioning compartment below.
Pressurized air from the air conditioning system flows through the space between the vapor seal and the center tank. A continuous flow of air is caused by the difference of air pressure (of the air conditioning system) and the ambient air pressure.
A system of drains at the rear of the vapor seal move the drainage and ventilating (exhaust) air through a drain mast. A leak monitor in the drain line keeps a small quantity of drainage for fuel leak analysis.
4. Power Supply____________ Not applicable
5. Interface_________ Not applicable
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Center Tank - Vapor Seal Area Venting
Figure 001
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6. Component Description
_____________________ Vapor Seal The vapor seal membrane is a sheet of composite material (Nomex fabric with Viton rubber) attached to 'Z' members on the underside of the tank with aluminum clamp strips and bolts.
Formed aluminum edge strips, seal the membrane to the perimeter of the tank. Aluminum fittings are used where the ventilating air supply pipe and the manual magnetic indicator (Ref. 28-43-00) pass through the membrane. Leak Monitor (Ref. Fig. 002) The leak monitor has a spur pipe that connects to the drain line between the center box and drain mast. A manually operated check valve is installed on the end of the spur pipe. The check valve lets a sample of the drainage to be taken to show if there is any fuel leakage from the root-ribs of the wing tank. The valve is operated to release the fuel by depressing the valve piston. This lifts the check valve and lets the fluid flow through the outer valve assembly. Drain Mast The drain mast is an aluminum fairing bolted to the underside of the fuselage. The vapor seal drainpipe and the belly fairing drain to atmosphere through the drain mast.
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