Technical data

13773-001
28-10
Page 530 Nov 2000
(2) Inspection/Check - Wing Fuel Tank
Note: No detectable fuel leaks are allowed after the repair procedure has been per-
formed. (Refer to 28-10)
(a) Drain a pint of fuel from the fuel tank through the drain valve into a clean, clear container.
Check this fuel sample for any evidence of contaminates. Repeat this same procedure,
draining at least a quart of fuel from the collector tank through drain valve.
(b) If no contaminates are found then no further action is required. Make an entry in the air-
plane logbook stating the inspection was performed.
(c) If contaminates are noted, the fuel tank must be drained and cleaned. (Refer to 12-10)
(3) Cleaning - Wing Fuel Tank
WARNING:
Special precautions must be observed when using solvents for cleaning.
Solvents used in cleaning are toxic and flammable. Fresh air masks and/or
adequate ventilation, eye protection, and skin protection must be used in all
closed areas.
(a) Acquire necessary tools, equipment, and supplies.
(b) Vacuum thoroughly to remove all chips, filings, dirt, etc., from the tank area.
(c) All surfaces to be sealed should be thoroughly cleaned by wiping with a clean cloth damp-
ened with Methyl Ethyl Ketone (MEK), acetone or similar solvent, and dried with a clean
cloth before allowing solvent to evaporate. Always pour the solvent on the cloth to prevent
contaminating solvent. Do not allow cloth to drip. Wipe surfaces with clean, dry cloths until
white haze disappears. Never use contaminated solvent.
(4) Repairing - Wing Fuel Tank
The following procedures are to be used for sealing integral fuel tanks made of composite mate-
rials. If a repair must be made to a bondline, joint or seam, the repair should be made using a
sealant that meets or exceeds MIL-S-8802. (Refer to 20-10) If the leak is coming from a small
pinhole located away from any bondlines, joints or seams, the repair must be made using a Type
2, Class 1 non-structural resin system. Repair procedures for composites are covered in Chap-
ter 51-00. (Refer to 51-00)
WARNING:
Purge the fuel tank with argon or carbon dioxide gas, prior to sealing leaks.
This will help minimize the possibility of an explosion. Use a portable vapor
detector to determine when it is safe to seal the fuel tank(s). Use only non-
sparking tools during the sealing process.
Prevent fuel drains, vent openings, and outlet screens from becoming
restricted when sealing fuel tanks.
Description P/N or Spec. Supplier Purpose
Methyl Ethyl Ketone (MEK) ASTM D-740
Type 1or 2
Any Source Cleaning
Acetone ASTM D-329 Any Source Cleaning