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4) Flush abundantly with (cold or hot) water for 15 to 30 seconds.
5) Air dry.
6) Apply two coats of anticorrosive primer.
NOTE : Apply the primer coats within 16 hours following alodine treatment.
7) Apply finishing paints.
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6. REAPPLICATION AND FOLLOW-UP OF ANTI-CORROSION PROTECTION ON IN SERVICE AIRCRAFT
A. Reminders about anti-corrosion protection
The anti-corrosion protection of TB aircraft comprises, in standard version :
1) Protection of light alloy parts by :
Chromic-acid anodizing,
or alodine (TB 13-002) + Epoxy primer,
or alodine (TB 13-002) + Epoxy primer + polyurethane finish.
2) Protection of steel parts by :
Cadmium plating,
or phosphating process + primer + paint,
or cataphoresis,
or alumination,
or primer + paint.
These protections are applied on detail parts in most cases and concern the whole aircraft, particularly hollow parts and areas which access is difficult or impossible.
Moreover, a reinforced anti-corrosion option may be performed in factory. This option completes standard protection by :
- painting of hollow parts,
- replacement of FERO (nickel-plated steel) and IMEX (aluminium rivet with steel shaft) rivets by MBC rivets,
- installation of remaining FERO rivets with interposition of PR,
- replacement of FERO rivets on exchanger by stainless steel rivets,
- interposition of PR between all structural parts.
Such a protection, standard or reinforced as an option, provides a good corrosion resistance. Nevertheless, in an agressive environment, particularly in salt ladden atmosphere, it may result useful to reinforce this protection, especially in areas where, due to normal use or under aggressive operational
environment, initial protection may be damaged.
B. Application and principle of anti-corrosion protection reinforcement
1) The method described hereafter intends to bring an additional preventive protection against generalized corrosion and against pitting corrosion which could occur in the presence of salty or not salty moisture or under effect of corrosive agents.
Its principle consists in application of an organic compound on the areas to be protected. This compound is intended to remove humidity and protect metals thanks to isolation film build-up.
2) This protection method is used as a preventive method.
When corrosion is initiated, refer to Paragraph 3 in order to treat it and neutralize it prior to any application of the under-mentioned recommended product.
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C. Recommended products
CORRODED AREAS RECOMMENDED
PRODUCTS SUBSTITUTE PRODUCTS
External areas which do not require the application of paint Protection product
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TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飞机维护手册 20 标准施工机体(37)
