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60 Cards in this Set
- Front
- Back
What is the greatest threat to the structural integrity of an air raft?
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metal corrosion
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Corrosion is detrimental to the integrity of an aircraft. It alters the structure of the materials that make up the aircraft in what manner?
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Reduction in strength and change in mechanical characteristics
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The materials used in the construction of an aircraft are chosen according to their
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Weight to strength ratio.
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Metal corrosion is defined as the deterioration of metal as it combines with what element?
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Oxygen
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On naval aircraft, what materials are used most often to separate susceptible alloys from the corrosive environment?
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Paints
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Describe the flow of electrons during electrochemical attack of a metal.
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Electrons flow from the anodic area to the cathodic area, resulting in the deterioration of the anodic area.
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What conditions are factors in the electrochemical reaction that causes metals to corrode?
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Heat, humidity, and moisture
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Because of variations in their composition, which of the following aircraft surfaces is the most susceptible to corrosive attack?
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thick structural
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What condition is the single greatest contributor to avionics corrosion?
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moisture
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What publication provides information on aircraft corrosion control for organizational-level maintenance?
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NA-01-1a-509
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What publication provides information on aircraft cleaning?
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NA-01-1a-509
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What publication provides information on avionics corrosion prevention and control?
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NA-01-1a-509
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What publication provides information on the preservation of naval aircraft and aircraft engines?
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NA-15-01-500
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What publication provides information on the general use of cements, sealants, and coatings used on aircraft?
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NA-01-1a-507
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When carrier-based aircraft are transferred to shore activities, what happens to the scope of most corrosion preventive programs?
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It decreases
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Normally, aircraft squadrons with the best corrosion preventive programs have what benefits?
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The best safety records, the most use of the aircraft, and the lowest operating cost
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As directed by NAVAIR, aircraft deployed aboard an aircraft carrier will be washed and cleaned a minimum of how often?
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every 7 days
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Mandatory aircraft cleaning is always required after an aircraft is exposed to what substances?
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Fire-extinguishing materials splashed on the landing gear.
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Unpainted surface of struts and actuating cylinder rods should be cleaned or wiped down at what prescribed interval?
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daily
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When handling, using, and storing aircraft cleaning materials, what is/are the most serious hazards you will meet?
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flammability and toxicity
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When using hazardous chemicals, you should wear what protective devices?
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Gloves and aprons, a face shield, and an approved respirator.
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Solvents must be kept in specially marked containers if they contain more than what percent by volume of chlorinated materials?
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24%
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When volatile and flammable materials are not being used, they should be stored in what areas?
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Inside a separate building or flammable liquids storeroom.
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What solvent is generally used as an all purpose cleaner in naval aviation maintenance?
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Dry-cleaning solvent
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What solvent is an alternative compound for cleaning acrylics?
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aliphatic naptha
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Safety solvent is intended for use when a high flash point is required. You should NOT use safety solvent to clean what areas of the aircraft?
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oxygen systems
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To neutralize the effects of urine and waste products in the lavatories of aircraft, you should use what cleaning agents?
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Ammonium hydroxide or sodium bicarbonate
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In an intermediate maintenance activity, an avionics/electrical maintenance branch that operates a "clean room" should use what type of MIL-C-81302 Freon cleaner?
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I
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To produce a high-luster, long-lasting polish on an unpainted aluminum clad surface, you should use what mechanical cleaner?
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Aluminum metal polish
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What devices should you use to perform a fast and economical cleaning of an aircraft?
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Conformable applicators
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What is the first step you must take before you clean an aircraft?
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Select the correct cleaning agent for the method of cleaning that you will use.
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What cleaning compound should be used to clean an aircraft that is painted with the tactical paint system?
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MIL-C-85570
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Surfaces that are lightly soiled with oil may be spot-cleaned by wiping them with what substance?
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Dry cleaning solvent
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Where should you place the cowling and access panels when they are removed during a maintenance task?
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on a pad or secure them to the aircraft
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The size and composition of an emergency reclamation team is determined by what criteria?
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Urgency of the situation.
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Under what condition is an aircraft most susceptible to a corrosive attack?
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When it is not being flown or when it is in shipment.
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How many levels of preservation methods are used on naval aircraft?
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3
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Level III preservation is used to preserve aircraft for what situation?
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long-term storage
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Level I preservation shall be applied to an aircraft when it is out-of-service for more than what minimum number of days?
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14
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What publication contains the requirements for Level I preservation?
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Special MRC
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What is the main disadvantage of grade IV corrosion preventive compound?
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It is easily removed by water spray
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What preservative compound should be used to provide protection for shock struts?
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Corrosion-preventive petroleum, class 3
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Piano-wire hinges require lubricating and corrosion protection. What water-displacing, low-temperature, lubricating should you use?
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VV-L-800
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You should use corrosion preventive compound MIL-C-81309, type III, on what equipment?
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Avionic and electrical equipment
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Corrosion may occur in several forms, depending on what factors?
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Metal involved, atmospheric conditions, and corrosion-producing agents present.
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Threadlike filaments that form under organic substances (such as paint film)
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Filiform corrossion
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Fungus growths on the sealing materials of integral fuel tanks?
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microbiological corrosion
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Slipping movement between two mating metal surfaces?
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fretting corrosion
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Uniform etching of the metal surfaces?
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direct surface attack
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Shallow indentations or deep cavities of small diameter that form on metal surfaces?
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pitting corrosion
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Caused by the difference in concentration of the electrolyte or the active metal on the anode and cathode?
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crevice attack
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Corrosive attack along the grain boundaries of a metal alloy?
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Intergranular corrosion
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Metal fractures caused by the combined effects of corrosion and stress applied in cycles to a part?
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Fatigue corrosion
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Dissimilar metals in contact in a corrosive medium, such as salt water?
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galvanic corrosion
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Lifting up of the metal surface caused by the force of expanding corrosion preducts occurring at the grain boundaries just below the metal surface?
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exfoliation corrosion
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To identify all the corrosion-prone areas of your squadron's aircraft, you should refer to what publication?
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PMIC
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When avionic and structural corrosion is compared, what effect is the main difference between avionic and structural corrosion?
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Small amounts of corrosion can make avionic systems inoperable
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Before performing any maintenance on avionic or electrical systems, you should make sure that you have completed what actions?
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Secure all external electrical power.
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What type of corrosion is usually found around electrical bonding and grounding straps?
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Galvanic
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What is the purpose of chemically treating a surface after the removal of corrosion products?
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To increase the surfaces resistance to corrosion and improve the paint bond to the surface.
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