F-111 Depot Fuselage Fuel Tank Deseal/Reseal Procedures.
SACRAMENTO AIR LOGISTICS CENTER MCCLELLAN AFB CA AIRCRAFT SYSTEMS ENGINEERING UNIT
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The original EC5106 sealant in F-111 aircraft fuel tanks was deteriorating, resulting in unacceptable leaks. To correct this problem, the tanks were to be desealed and resealed with MIL-S-83430 polysulfide sealant. However, laboratory tests indicated that the MIL-S-83430 sealant alone would be attacked by the reverted EC5106 sealant to the extent that the desealreseal process would be required again in about five years. It is impossible to remove all the reverted sealant. The Physical Sciences Laboratory Section of the Sacramento ALC Industrial Products Division determined by testing that EC2216 epoxy, added as a barrier, would prevent damage to the MIL-S-83430 sealant for at least ten years. The report establishes procedures to accomplish the complete desealing and resealing of F-111D aircraft, assuring a positive seal throughout all of the fuselage integral fuel tanks. Author
- Attack and Fighter Aircraft