Extended Layup of Boeing 747
April 21, 2020
The purpose of this specification is to provide recommendations for the preservation of aircraft using Vapor phase Corrosion Inhibitors and related Cortec® Technologies. These products are typically environmentally responsible, provide multi-year protection, and—with proper selection—do not need to be removed and minimize HSE or disposal issues. Protection is achieved by creating an ionically bonded molecular film on the surface of the metal. This ionic bonding process absorbs all free electrical charges of electrons on the metal surface, thus preventing the onset of corrosion, which requires a free electrical charge to combine with corrosive elements such as O2.
The below picture demonstrates (1) that the presence of water is not an issue and (2) that products containing Vapor phase Corrosion Inhibitors protect both in the contact phase and vapor phase.
a. Wash all external surfaces with a 10% solution of VpCI®-415 (Boeing D6-17487, Rev P; MIL-PRF-8937D)
b. Clean all internal surfaces per airline standards
c. Verify no visual corrosion/oxidation on any metal surfaces; if found, remove with EcoAir® 423 and EcoAir® 414
d. Flush and clean all toilets and waste holding tanks
e. Fuel system – after fuel has been removed from plane, add approximately 130 gallons (492 L) of VpCI®- 707
i. Add VpCI®-707 at 0.2% by volume of system to be protected (approximately 130 gallons [492 L] of VpCI®-707)
ii. Operate fuel transfer system to coat entire fuel system – including lines, valves, and pumps and air refueling systems
iii. Alternate method is to open all access ports to fuel tanks/cells and fog inhibitor at 0.5 oz./ft3 (0.5 mL/L) of system volume, approximately
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