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GENERAL 07
Cleaning & Corrosion Control
| Question | Answer |
|---|---|
| Name at least three factors influencing corrosion. | 1) The environmental conditions,2) The type of metal, 3) The presence of dissimilar metals, 4) The condition of protective coatings; 5) The presence contaminates and electrolytes |
| Name at least three form of corrosion? | Answer includes: 1 surface, 2) dissimilar metal, 3) intergranular, 4) filiform, and 5) fretting |
| Name at least four procedures commonly used in the corrosion preventive maintenance process. | Answer includes: 1) Cleaning: 2) Lubrication; 3) Inspection; 1) Treatment, 5) Keeping drain holes clear; 6 Drain fuel sumps; 8) Daily wipe down; 8) Sealing; 9) Using protective covers |
| Name at least five areas of an aircraft that are prone to corrosion. | Answer includes: 1) Exhaust trail areas; 2) Battery compartments; 3) Vent openings 4) Bilge areas; 5) Wheel wells; 6) Landing gear; 7) Wing flap recesses; 8) Piano hinges 9) Any areas that can entrap water |
| What are the proper tools for removing corrosion from anodized aluminum surfaces? | Aluminum wool, aluminum wire brushes, non-metallic bristle brushes, or nylon scrubber pads (Scotch-Brite, etc.) |
| What general precautions should be used when washing an aircraft? | Avoid or protect areas which may be damaged or contaminated such as: bearings, hinges, sealed areas, and pitot and static ports |
| What are some types of light duty cleaning agents? | soap and synthetic detergents |
| What are some types of heavy duty cleaning agents? | Solvents and emulsions |
| What are the two general conditions that may cause stress corrosion cracking? | Sustained tensile stresses and a corrosive environment |
| How may filiform corrosion be recognized? | A Blistered paint surface and won or fern-like patterns/under the paint |
| What type of agent is preferred for cleaning plastic surfaces? | Soap: and water or a manufacturer approved cleaner |
| Why should aluminum metal polish NOT be used on anodized aluminum surfaces? | It will remove the oxide coat |
| What is generally recommended to clean grease, fuel, or oil from aircraft tires? | Soap and water |
| Why should only recommended cleaners be used on aircraft fabrics or plastics? | Their use causes less deteriorating effects. |
| Name at least one of the principal causes of filiform corrosion | Answer includes: (1) Improper or incomplete curing of wash primer prior to painting: (2) Failure to keep acidic surface contaminants washed off |
| Why is an aircraft cleaned before inspection? | It enables the mechanic to conduct a more accurate inspection |
| How may fretting corrosion in aluminum be readily identified? | By the appearance of corrosion products residue (frequently originating around and streaming back from rivet heads) having a dark smoky or sooty appearance |
| Why are piano-type hinges prime spots for corrosion? | Piano hinges are corrosion prone due to dissimilar metal contact between the steel pin and aluminum hinge and because of their design, which tends to trap contaminants: |
| How are piano-type hinges protected from corrosion? | By being kept as clean as possible and properly lubricated |
| What is Alodine used for? | Aldine treatment deposits a chemically formed oxide on aluminum alloys to improve corrosion resistance and enhance paint bonding qualities |
| is it permissible to use steel wool or steel wire brushes on aluminum surfaces? | It is not permissible to use steel wool or steel wire brushes on aluminum because face, steel can become embedded in the aluminum and cause corrosion |
| What is the most common type of corrosion? | Surface |
| What is an acceptable method for removing, surface corrosion from Titanium? | Answer includes: 1) Stainless steel wool or brush, 2) aluminum oxide paper, 3) Scotch-brite, 4) abrasive blast with glass beads, and 5) hand polish with aluminum polish and soft cotton cloth |
| What form of corrosion is an attack along the grain boundaries of an alloy that is usually caused by improper heat treatment? | Intergranular Corrosion |
| The lifting and flaking of a metal surface due to the buildup of corrosion products, as a result of severe Intergranular corrosion, is an indication of what form of corrosion? | Exfoliation |
| What is another name for corrosion caused by contact of dissimilar metals? | Galvanic Corrosion |
| What form of corrosion can be found in battery compartments? | Direct chemical attack, or chemical corrosion |
| Name a least one type of surface treatment used on aluminum surfaces. | Alodizing, Anodizing |
Created by:
Chisum
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