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153 Cards in this Set
- Front
- Back
How does corrosion endanger aircraft or reduce the margin of safety?
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Corrosion reduces the strength and changes the mechanical characteristics of the material.
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All maintenance personnel must be formally trained in what program?
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Corrosion control.
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What is the primary factor to consider when selecting materials for constructing an aircraft?
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Weight-to-strength ratio.
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The decay of metals as they combine with oxygen is known as what type of corrosion?
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Metal corrosion.
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What does an intact coat of paint provide to naval aircraft?
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Protection from corrosive environments.
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In an electrochemical attack, electron flow is established in which direction?
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Electron flow is established from the anode to the cathode.
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How will heat, humidity, and moisture affect the electrochemical reactions that cause metal to corrode?
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They speed the corrosion process.
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Why are thick structural sections most susceptible to corrosive attack?
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Thick sections are more likely to have variations in their composition, particularly if heat-treated during fabrication.
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In relation to corrosion, what affect does moisture have on avionics equipment?
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Moisture is the single largest contributor to avionics corrosion.
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Which NAVAIR publication is entitled Aircraft Weapons Systems Cleaning and Corrosion Control?
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NAVAIR 01-1A-509.
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NAVAIR 16-1-540 provides what information?
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NAVAIR 16-1-540 provides information on cleaning and corrosion prevention and control of avionics equipment.
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Information on the preservation of Naval aircraft and aircraft engines can be found in what publication?
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NAVAIR 15-01-500, Preservation of Naval Aircraft.
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What information can you find in NAVAIR 01-IA-507?
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General uses for cements, sealants, and coatings.
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At a minimum, how often must aircraft be cleaned?
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Every 14 days.
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What should happen to a good corrosion preventive program when carrier-based aircraft return to a shore activity after a deployment?
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A period of intensive care should follow the deployment cycle to bring the aircraft back up to standard.
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Operating units that have the best safety records, maximum use of aircraft, and lowest operating costs will also have what program?
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A good corrosion prevention program.
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What must be done on a daily basis with unpainted aircraft surfaces and actuating rods?
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They must be cleaned or wiped down.
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What are the most serious hazards in handling, using, and storing aircraft cleaning materials?
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Flammability and toxicity
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Why is there a requirement to use a respirator when working with solvents?
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Inhaling toxic vapors can seriously affect the brain and central nervous system.
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What must be done specifically when storing solvents that contain more than 24% chlorinated materials?
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They must be kept in specially marked containers.
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Where must flammable liquids be stored when not in use?
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In a separate building or-flammable liquids storeroom.
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By what four means is dry-cleaning solvent applied?
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It is applied by spraying, dipping, brushing, or wiping.
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Safety solvent is currently referred to by what name?
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1,1,1-trichloroethane.
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What material must be avoided as a substitute to aluminum oxide abrasive cloth and why?
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Silicon carbide paper because it is sharp and the individual grains can penetrate steel surfaces.
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Why is the conformable applicator cleaning pad better than a mop or bristle brush when cleaning aircraft surfaces?
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Because it conforms to the surface, the applicator allows easier application of a constant scrubbing pressure on curved skin panels.
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Types I, II, and IV of what cleaning compound are to be used on tactical paint schemes?
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MIL-C-85570.
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What is the first step in efficiently cleaning an aircraft?
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Select the proper cleaning agent for the method of cleaning chosen.
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When cleaning an aircraft what are the two directions in which cleaning compound and rinsing are applied?
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Upward and outward.
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What substance may be used to spot-clean lightly soiled areas?
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Dry-cleaning solvent.
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Why should dry-cleaning solvent not be used in oxygen areas or around oxygen equipment?
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It is not oxygen compatible and will cause explosion or fire.
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In emergencies when regular waterproof canvas covers are not available, what materials can you use as covers and shrouds?
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A polyethylene sheet, polyethylene-coated cloth, or metal foil barrier materials.
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The ground handling requirements for an aircraft can be found in what publication?
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The maintenance instructions manual (MIM).
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What technical publication covers emergency reclamation procedures for naval aircraft?
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NAVAIR 01-1A-509.
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State the levels and terms of preservation used for naval aircraft.
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Level I—Short term, up to 90 days.
Level II—Mid-term, up to 1 year. Level III—Long term, indefinitely. |
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Corrosion-preventive petroleum, class 3, provides protection for what type of surfaces?
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Antifriction bearings, shock-strut pistons, and other bright metal surfaces.
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What level of preservation is required if an aircraft is scheduled to remain idle for more than 14 days but less than 90 days?
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Level I preservation.
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MIL-C-16173, corrosion preventive compound, is available in three grades. Which grade(s) is/are easily removed with dry-cleaning solvent?
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All three. Grades I, II and IV.
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When is general-purpose lubrication oil VV-L-800 used?
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It is used when a water-displacing, low temperature, lubricating oil is required.
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What type of corrosion-preventive compound MIL-C-81309 is used on avionics and electrical equipment?
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Type III.
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What level of engine preservation requires the fuel system to remain at least 95 percent full of fuel for a period not to exceed 90 days?
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Level I.
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What technical corrosion manual should you use for support equipment?
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Ground Support Equipment Cleaning and Corrosion Control, NAVAIR 17-1-125.
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What are the two sealants recommended for use on support equipment?
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Silicone sealant MIL-A-46146, type I, and
Polysulfide sealant MIL-S-81733 or MIL-S-8802. |
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The tarnishing of silver is a common example of what type of corrosion?
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Uniform or direct surface attack
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Pitting is the most common effect of corrosion on what alloys?
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Aluminum and magnesium alloys.
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Pitting corrosion is first noticeable as what color deposit on a metal surface?
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White or gray powdery deposit.
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How can concentration cell corrosion be controlled or even prevented?
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Avoid the creation of crevices during repair work.
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Define inter-granular corrosion.
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Inter-granular corrosion is an attack on the grain boundaries of alloys under specific conditions.
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What is usually the cause of dissimilar metal corrosion?
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It is usually the result of faulty design or improper maintenance practices.
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What are some examples of internal stress corrosion?
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Stress induced by press-and-shrink fits and those in rivets and bolts.
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What causes fatigue corrosion?
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Fatigue corrosion is caused by the combined effect of corrosion and stress applied in cycles to a component.
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What is the cause of fretting corrosion?
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A slight vibration, friction, or slippage between two contacting surfaces that are under stress or heavy load.
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Filiform corrosion occurs on what types of metals?
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Steel, aluminum, and magnesium.
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The corrosion-prone areas for each specific aircraft are detailed in what publication?
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Applicable periodic maintenance information cards (PMICs).
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What are the three requirements for a corrosion cell to form?
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A cathode, an anode, and an electrolyte.
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Cockpit fasteners should be touched up with what color paint?
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Black paint to prevent glare.
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In water entrapment areas of an aircraft, drains are required to be inspected how often?
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Daily.
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What publication should you refer to for information about structural corrosion?
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NAVAIR 01-1A-509.
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Hydrated ferric oxide is commonly known as what kind of corrosion?
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Iron rust.
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What are the three types of aluminum surfaces insofar as corrosion removal is concerned?
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Clad, anodized, and exfoliated.
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How should you remove corrosion from clad aluminum surfaces?
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Hand polish the corroded areas with MIL-P-6888 metal polish.
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What is the primary type of aluminum used on naval aircraft?
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Non-clad aluminum alloys.
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What are the approved tools for cleaning anodized aluminum surfaces?
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Aluminum wool or fiber bristle brushes.
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Who should evaluate any loss of structural strength in critical areas of an aircraft?
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An aeronautical engineer.
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What manual should you refer to for tolerance limits for dimensions of critical structural members?
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Structural repair manuals for the specific aircraft model.
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Where is titanium most often used on a aircraft?
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In the engine exhaust areas.
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Copper and copper-based alloys are used in avionic systems for what applications?
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Contacts, springs, connectors, printed circuit board runs, and wires.
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What must you do before starting corrosion removal?
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Conduct an inspection and evaluation of the suspected area.
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How should you remove moderate corrosion?
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Extensive hand sanding or light mechanical sanding.
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What is the most desirable method of mechanical corrosion removal?
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VACU-Blast dry honing portable machine.
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What is the preferred surface preparation method for many of the components of support equipment?
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Abrasive or grit blasting.
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What should you use during the abrasive process to prevent flash rusting?
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Sodium Nitrite MIL-S-24521.
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Information regarding corrosion removal limitations can be found in what publications?
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The applicable aircraft Structural Repair Manual (SRM) or the “Corrosion” section of the Maintenance Instruction Manual (MIM)
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What is the purpose for chemically treating a surface for painting?
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Chemical conversion coatings increase a surfaces resistance to corrosion and improve paint bonding to the surface.
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When failure of the coating occurs, you should remove corrosion and touch up the bare magnesium with what chemical treatment solution?
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MIL-M-3171.
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What is the primary purpose of any paint finish?
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The protection of the exposed surfaces against decay.
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When using paint removers, you should wear what type of protective clothing?
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You should wear eye protection, gloves, and a rubber apron.
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What safety precaution must be taken before cleaning and stripping old finishes on aircraft?
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Ensure the aircraft is properly grounded.
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What type of motor should you use to power a flap brush?
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Use a NO LOAD 3200 rpm pneumatic drill motor.
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Complete information on the types and applications of aircraft paint systems is contained in what publication?
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NAVAIR 01-1A-509.
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After it is mixed, the storage life of epoxy-polyamide primer is limited to the amount that can be used in how many hours?
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4 hours.
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What is the standard, general-purpose, exterior protective coating for aircraft surfaces?
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Aliphatic polyurethane, MIL-C-85285.
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What are the two classes of spray guns?
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Suction feed and pressure-feed spray guns.
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When flammable materials are used, all sources of ignition must be at least how far away from the work location?
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50 feet.
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What is the greatest threat to the structural integrity of an aircraft?
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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 what characteristics?
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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 which of the following elements?
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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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Which of the following is a description of the flow of electrons during electrochemical attack of a metal?
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Electrons flow from the cathodic area to the anodic area, resulting in the deterioration of the anodic area
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Which conditions affect the rate at which electrochemical reactions cause 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 surfaces
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Which of the following conditions is the single greatest contributor to avionics corrosion?
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Moisture
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Which of the following publications provides information on aircraft corrosion control for organizational-level maintenance?
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NAVAIR 01-1A-509
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Which of the following publications provides information on aircraft cleaning?
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NAVAIR 01-1A-509
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Which of the following publications provides information on avionics cleaning and corrosion prevention and control?
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NAVAIR 16-l-540
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Which of the following publications provides information on the preservation of aircraft engines?
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NAVAIR 15-01-500
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Which of the following publications provides information on the preservation of naval aircraft?
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NAVAIR 15-01-500
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Which of the following publications provides information on the general use of cements, sealants, and coatings used on aircraft?
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NAVAIR 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 which of the following benefits?
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The best safety records
The most use of the aircraft The lowest operating costs |
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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 14 days
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Mandatory aircraft cleaning is always required after an aircraft is exposed to which of the following substances?
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Fire-extinguishing materials
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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 hazard(s) you will meet?
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Flammability and toxicity
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When using hazardous chemicals, you should wear which of the following 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 which of the following 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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Which solvent is an alternate compound for cleaning acrylics?
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Aliphatic naphtha
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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 which of the following areas of an 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 which of the following 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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MIL-C-81302, Type 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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Which of the following devices should you use to perform a fast and economical cleaning of an aircraft?
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Conformable applicators
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There are several steps that you must take before you can actually clean an aircraft. Which of the steps listed below is the first one you should take?
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Select the correct cleaning agent for the method of cleaning that you will use
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Which of the following cleaning compounds 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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To ensure complete cleaning and rinsing of all aircraft surfaces, you should use which of the following washing sequences?
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Underside of wings, fuselage, and tail, spraying water from the wing tips and fuselage ends, inboard to outboard, followed by the same sequence on the upper surfaces.
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Surfaces that are lightly soiled with oil may be spot-cleaned by wiping them with which substance?
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Dry-cleaning solvent
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In an emergency when an aircraft is without a regular waterproof canvas cover, suitable covering and shrouding may be accomplished by the use of which materials?
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Polyethylene sheet, polyethylene coated cloth, and metal foil barrier material
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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 which of the following conditions 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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Three
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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 should be applied to an aircraft when it is out-of-service for more than what minimum number of days?
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14 days
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Which aircraft-specific publication contains the requirements for Level I preservation?
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Special MRCs
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Which of the following is the main disadvantage of grade IV corrosion preventive compound (paralketone)?
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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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Preservative hydraulic oil, MIL-H-46170
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Piano-wire hinges require lubricating and corrosion protection. What water displacing, low-temperature, lubricating oil should you use?
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Lubricating oil, general-purpose, preservative, VV-L-800
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You should use corrosion preventive compound MIL-C-81309, type III, on which of the following equipment?
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Avionic and electrical equipment
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Which of the following is a laminated metal-foil material used for the protection of acrylics during cleaning?
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Water vaporproof barrier material
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You should check for corrosion and deterioration during which of the following routine inspections?
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Daily, phase, and postflight
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Corrosion may occur in several forms, depending on which of the following factors?
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Metal involved,
Atmospheric conditions, Corrosion-producing agents present |
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What type of corrosion forms threadlike filaments under organic substances (such as paint film).
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Filiform corrosion
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Fungus growths on the sealing materials of integral fuel tanks are what type of corrosion?
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Microbiological corrosion
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What type of corrosion is caused by slipping movement between two mating metal surfaces?
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Fretting corrosion
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What type of corrosion results in uniform etching of the metal surfaces?
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Direct surface attack corrosion.
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What type of corrosion forms shallow indentations or deep cavities of small diameter on metal surfaces?
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Pitting corrosion
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What type of corrosion is 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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What ype of corrosion results in 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 are what type of corrosion?
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Fatigue corrosion
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What type of corrosion is caused by dissimilar metals in contact in a corrosive medium, such as salt water?
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Galvanic corrosion
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What type of corrosion results in lifting up of the metal surface caused by the force of expanding corrosion products 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 which of the following publications?
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Applicable periodic maintenance information cards (PMICS)
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When avionic and structural corrosion is compared, which of the following effects 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 which of the following 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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You are inspecting an aircraft ejection seat. It is very important that even the slightest indication of corrosion be found for which of the following reasons?
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Corrosion can weaken the structural soundness of the seat
Slight amounts may indicate problems that are not visible Slight amounts may cause the seat to be inoperable |
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When inspecting engine frontal areas and cooling air vents, what types of discrepancies are you likely to find?
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Dirt, dust, gravel, and rain erosion
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One corrosion-prone area of an aircraft is the bilge area. What condition is the best insurance against corrosion in this area?
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A clean, dry bilge area
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What are the two purposes of chemically treating a surface after the removal of corrosion products?
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To increase the surfaces resistance to corrosion
To improve the paint bond to the surface |
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True or False. The dry honing machine may be used on any aircraft skin or surface.
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False.
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What are corrosion damage limits?
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Corrosion damage limits refer to the amount of metal that may be removed from a corroded part without impairing the strength and function of the part.
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