Surface Protection Flashcards
What is the purpose of surface protection treatments?
To prevent corrosion,damage by aggressive fluids & provide erosion protection against metallic structures and UV
What is surface protection use based on?
-material
-function
-location
What do nearly all external areas on an aircraft share?
Surface protection
What areas are exempt from surface protection?
-leading edges of slats,wing tips & fences (bonding primer on anodised surfaces only)
-leading edges of the engine intake cowls
-external surfaces of the pylon made of corrosion resistant materials eg titanium
-scuff plates on passenger or cargo doors
-equipped components eg angles of an attached sensor & static port areas
What are the 3 types of surface protection?
-pre-treatment
-paint coatings
-special coatings
Name 5 methods of surface protection?
-passivisation
-sacrificial coatings
-chemical films
-electroplating
-mechanical processes such as painting
Name the 2 types of pre-treatment?
-anodising
-chromating
Name the two parts in which painting is divided into?
-primer
-topcoat
Name the two types of special coatings?
Type 1 = water repellent coating is generally made from silicone-free materials organically bound with a mineral il base to repel moisture
Type 2 = heavy duty corrosion preventing compound
Name the 3 cleaning methods?
-wet washing
-dry washing
-polishing (broken down into hand & mechanical)
What is the cleaning method used on an aircraft determined by?
Type of dirt & desired result
Define a wet wash?
Removes oil,grease,carbon deposits & most dirt apart from corrosion & oxide films
Define a dry wash?
Removes film,dust & small accumulations of dirt where wet wash isn’t desirable or practical uses spray,mops,cloths etc
Define polishing?
Restores brightness,colour. Done after cleaning & can also remove oxidation + corrosion
Is periodic cleaning part of routine maintenance?
Yes
Where can you find reccomended cleaning solutions?
In the AMM
What is not allowed to be used when cleaning an aircraft?
Unauthorised solvents or detergents
What are the requirements for exterior cleaning?
-all panels & covers to be in place
-openings to be sealed off
-thick mud,grease & oil to be removed by hand
-avoid damage to paint & anti-corrosive treatments
-allow solutions to penetrate surface before being rinsed
-re-lubrication may be necessary after
What are the requirements for carriage of livestock?
-very thorough cleaning of interior needed after
-particular attention needed for bilge areas and cargo compartment
-recommended disinfectant must be used
-any corrosion-protection treatment to be restored
