Aircraft Corrosion Control and Maintenance
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Questions and Answers

The prevention and control of corrosion on aircraft is whose responsibility?

Command

Which of the following is a part of a disciplined preventive maintenance program?

Keeping low-point drains open

What is the primary reason aircraft should be cleaned regularly?

Allow for a thorough inspection

MIL-PRF-85570, Type IV is recommended for cleaning which of the following?

<p>Exhaust tracks and gun blast deposits</p> Signup and view all the answers

What is the first step when operating the portable 15 gallon foam generating cleaning unit?

<p>Release the pressure</p> Signup and view all the answers

The proper pressure for the air regulator when operating the portable 45 gallon foam generating cleaning unit is between _____ psi.

<p>30-70</p> Signup and view all the answers

Which of the following requires approximately 14 cfm of air at 50 psi to siphon solvent or cleaner from a container?

<p>Spray cleaning gun</p> Signup and view all the answers

Which of the following must be operated in the horizontal position?

<p>Universal washer unit</p> Signup and view all the answers

Put the steps for cleaning preparation in the correct sequence.

<ol> <li>Apply pre-wash lubrication. 2. Inspect for water or cleaning compound intrusion. 3. Cover vents, openings, and ports.</li> </ol> Signup and view all the answers

Which of the following should be used prior to lubricating any components or parts to remove any foreign matter from joints, fittings, and bearing surfaces?

<p>Non-woven cleaning cloth</p> Signup and view all the answers

The preferred method is _____________ when fresh water is available for rinsing purposes.

<p>Detergent cleaning</p> Signup and view all the answers

Routine scheduled cleaning should not be performed at temperatures below how many degrees Fahrenheit?

<p>40</p> Signup and view all the answers

When performing the post-cleaning procedures, which of the following is used to remove all tape adhesive residues?

<p>MIL-PRF-680, Type II</p> Signup and view all the answers

Which of the following is the first step in the post-cleaning procedures?

<p>Remove covers and masking tape</p> Signup and view all the answers

Aircraft wash rack cleaning waste shall receive the equivalent of what type of sewage treatment?

<p>Secondary</p> Signup and view all the answers

If your wash rack is a source of hazardous waste, which of the following should you contact to determine corrective action?

<p>Base safety</p> Signup and view all the answers

Which type of lubricant prevents galvanic corrosion coupling on close tolerance fittings and reduces fretting?

<p>MIL-L-46010</p> Signup and view all the answers

Which of the following can be used to apply lubricants?

<p>Grease gun, lever type</p> Signup and view all the answers

When applying lubricants through pressure type fittings with a grease gun, clean grease fitting with which of the following before applying lubricant?

<p>MIL-PRF-680, Class C</p> Signup and view all the answers

Which of the following is used to protect metal aircraft parts and components by preventing corrosive materials from contacting and corroding bare metal surfaces?

<p>Corrosion preventive compound</p> Signup and view all the answers

Which of the following is a water displacing corrosion preventive compound which forms a clear, dry, flexible film?

<p>MIL-C-85054</p> Signup and view all the answers

Daily cleaning or wipe down is required on all exposed, unpainted surfaces when deployed within how many miles of salt water and when flown below 3000 feet over salt water?

<p>3</p> Signup and view all the answers

Highly alkaline cleaning compounds, with a pH greater than _____, are not authorized for Navy aircraft.

<p>10</p> Signup and view all the answers

Which of the following is essential to the overall corrosion control program?

<p>Frequent corrosion inspections</p> Signup and view all the answers

Who is responsible for an effective preventive maintenance program?

<p>All maintenance personnel</p> Signup and view all the answers

During scheduled or unscheduled maintenance actions on aviation equipment or components, the area involved as well as those within what distance of the repair or treatment area must be visually inspected for corrosion?

<p>36 inches</p> Signup and view all the answers

Put the steps for performing a general inspection of aviation equipment in the correct sequence.

<ol> <li>Clean the area thoroughly. 2. Examine the area. 3. Remove corrosion.</li> </ol> Signup and view all the answers

What does fluorescent penetrant inspection detect?

<p>Stress corrosion cracking</p> Signup and view all the answers

Put the steps for performing an evaluation of corrosion damage in the correct sequence.

<ol> <li>Determine if corrosion is in an area that has been previously reworked. 2. Measure the damage. 3. Use a straight edge and a 10X magnifying glass to inspect the area suspected of being previously reworked. 4. Evaluate the depth of the previous rework.</li> </ol> Signup and view all the answers

When evaluating corrosion damage, a straight edge and what type of magnifying glass may be used to assist in determining if an area has previously been reworked?

<p>10X</p> Signup and view all the answers

What are the categories used for reporting degrees of corrosion? (Select all that apply)

<p>Light</p> Signup and view all the answers

What is the maximum depth that light corrosion is discolored and pitted?

<p>One mil (0.001 inch)</p> Signup and view all the answers

Corrosion in faying surfaces, seams, and joints is usually detectable by which of the following?

<p>Bulging on the skin surface</p> Signup and view all the answers

Which type of hinges are especially vulnerable to corrosion?

<p>Piano</p> Signup and view all the answers

Paint removal by scuff sanding must not go beyond the primer coat, since complete removal of the paint can damage fibers in the surface layers of which of the following?

<p>Composite materials</p> Signup and view all the answers

Due to the irregularities in composite surfaces, complete removal of the paint can damage which of the following in the surface layers?

<p>Fibers</p> Signup and view all the answers

Which paint removal would you use for areas of several square inches or less?

<p>Abrasive mat</p> Signup and view all the answers

Failure to remove all the corrosion may allow the corrosion to continue after affected surfaces are which of the following?

<p>Refinished</p> Signup and view all the answers

Match the scraper to the metals it is used for removing corrosion.

<p>Plastic scrapers = Any metal surfaces Aluminum scrapers = Aluminum and magnesium surfaces Steel scrapers = Steel surfaces</p> Signup and view all the answers

What should you use to prepare the surface of water sensitive areas?

<p>Approved cleaning solvent</p> Signup and view all the answers

Chemical prepaint treatments are also known as which of the following?

<p>Chemical films</p> Signup and view all the answers

Chromic acid (Form II powder) is a strong oxidizer and may ignite on contact with organic materials and which of the following?

<p>Reducing agents</p> Signup and view all the answers

What should you do if chemical prepaint treatments accidentally contact the skin or eyes?

<p>Flush immediately with plenty of clean water</p> Signup and view all the answers

Where should mixing of a chemical prepaint treatment be done, so as to avoid breathing toxic vapors?

<p>A well ventilated area</p> Signup and view all the answers

Which of the following factors may require more drying time for chemical conversion coatings?

<p>Low temperature</p> Signup and view all the answers

With what must the prepared surface be cleaned if it is allowed to become dirty or is scratched?

<p>Wet abrasive mat</p> Signup and view all the answers

Under which conditions should you apply corrosion preventive compounds?

<p>Operations will not permit the use of the corrosion treatment methods.</p> Signup and view all the answers

What is the primary purpose of sealants?

<p>To prevent the intrusion of moisture</p> Signup and view all the answers

Sealants are used on battery compartments and relief tanks for which of the following reasons?

<p>Acid resistance</p> Signup and view all the answers

Which of the following generally consists of one component, which cures by reacting with moisture in the air?

<p>MIL-A-46146</p> Signup and view all the answers

How long may it take to achieve a full cure for sealing compounds?

<p>7 days</p> Signup and view all the answers

The application life of a sealant is the length of time that a mixed sealing compound remains usable at 75° Fahrenheit and how much relative humidity?

<p>50%</p> Signup and view all the answers

An increase of how much temperature above 75° Fahrenheit is necessary to cut the application time by approximately half?

<p>18°</p> Signup and view all the answers

What should you do with the sealant kit if the working time is not suitable for the intended purpose?

<p>Dispose of the kit</p> Signup and view all the answers

Why should care be taken when using rivet nozzles?

<p>To prevent sealant material from filling fastener holes</p> Signup and view all the answers

Which style of semkit holds proportioned amounts of the two components separated by an aluminum barrier?

<p>Barrier style</p> Signup and view all the answers

Which of the following is an example of a fairing or smoothing tool for working sealants and adhesives into seams?

<p>Spatula</p> Signup and view all the answers

Which kind of sealant smoothing tools may be manufactured as needed to fit a specific situation?

<p>Plastic</p> Signup and view all the answers

Which of the following sealants is non-toxic?

<p>ePTFE sealing tapes</p> Signup and view all the answers

RTV silicone adhesive/sealants conforming to MIL-A-46106 emit acetic acid and, therefore, are which of the following?

<p>Corrosive</p> Signup and view all the answers

Which type of brush should you use to clean around bolts, rivets, or other hard to reach areas?

<p>Stiff bristle</p> Signup and view all the answers

When applying sealants, what should you not allow to happen to the solvent, because it will allow some or all of the oil and dirt to redeposit, making it impossible to be removed with a dry cloth?

<p>Evaporate</p> Signup and view all the answers

For how much of its original shelf life can a batch of sealant be extended if it achieves approximately the same hardness as sealant from kits that are not over aged?

<p>One-half</p> Signup and view all the answers

In general, store paint materials between _____ and 100 degrees Fahrenheit?

<p>40</p> Signup and view all the answers

If during a test of paint material the material dries properly, the shelf life may be extended for how long?

<p>6 months</p> Signup and view all the answers

The primary purpose of any paint system is the protection against which of the following and other forms of deterioration?

<p>Corrosion</p> Signup and view all the answers

Which of the following would be considered an operational use for painting?

<p>For camouflage</p> Signup and view all the answers

FED-STD-595 (color fandeck) provides a list of paint colors represented in five digit numbers. Match the description to the number which represents that description.

<p>First digit = Gloss value Second digit = Color Remaining three digits = Color value or hue</p> Signup and view all the answers

How long may it take to achieve a full cure for sealing compounds?

<p>7 days</p> Signup and view all the answers

Electrostatic painting is useful for painting small areas and produces _____ overspray with _____ transfer efficiency.

<p>Little, high</p> Signup and view all the answers

Brushes and rollers are _____ for touch-up painting.

<p>Alternatives</p> Signup and view all the answers

Paint equipment shall be thoroughly cleaned immediately after use or at least every how many hours?

<p>2</p> Signup and view all the answers

Which of the following is true of using paint equipment?

<p>False</p> Signup and view all the answers

Which of these is true concerning surface preparation?

<p>True</p> Signup and view all the answers

How should unevenly etched faying surface joints or fasteners and sharply protruding objects or corners be scuff sanded?

<p>By hand</p> Signup and view all the answers

All aircraft shall be _____ during all painting procedures in order to guard against the danger of fire from static electricity.

<p>Grounded</p> Signup and view all the answers

The epoxy paint system consists of which of the following and a compatible topcoat?

<p>Primer</p> Signup and view all the answers

MIL-PRF-81352, Type I, acrylic lacquer coating can be used for application of/on which of the following where environmental regulations permit?

<p>Temporary markings</p> Signup and view all the answers

What is the health hazard while breathing the vapors from organic solvents?

<p>Dangerous</p> Signup and view all the answers

All permanent structures shall be installed with MIL-PRF-81733 sealant at which of the following surfaces?

<p>Faying</p> Signup and view all the answers

All removable structures shall be installed at the faying surfaces with which type of sealant?

<p>Class B</p> Signup and view all the answers

All rivets shall be installed wet with MIL-PRF-81733 sealant, except those located where?

<p>In fuel contact areas</p> Signup and view all the answers

Which method should be used for applying corrosion preventive compound to interior surfaces of tubing closed by welded end plugs or components?

<p>Fill and drain method</p> Signup and view all the answers

Where is the source for water intrusion found on cases and covers?

<p>Lead-in attachment points</p> Signup and view all the answers

With how many coats of epoxy primer should electrical conduit (exterior) and junction boxes (interior and exterior) be coated to electrically insulate them?

<p>Two</p> Signup and view all the answers

Which compound is used to prevent corrosion on pin and/or pin receptacle end of connectors?

<p>MIL-C-81309</p> Signup and view all the answers

To prevent malfunctions caused by EMI, what must be either built into the avionic device or added to access panels and doors?

<p>Electrically conductive shielding</p> Signup and view all the answers

As a general rule, grease shall not be applied to rubber parts, but some parts require a grease coating. Which of the following is one of those parts?

<p>O rings</p> Signup and view all the answers

With respect to depleted uranium counterweights, if corrosion occurs, what should you apply to prevent further corrosion?

<p>AMLGUARD</p> Signup and view all the answers

What should you not do to depleted uranium under any circumstances?

<p>Sand</p> Signup and view all the answers

Which of the following best represents the mixture ratio of isopropyl alcohol and distilled water used to clean battery compartments?

<p>70% Alcohol, 30% Water</p> Signup and view all the answers

How often should interior and exterior relief tube areas be inspected and cleaned?

<p>After each flight</p> Signup and view all the answers

If the surface of a steel cable is corroded, how should you relieve cable tension and force the cable open to inspect it?

<p>Reverse twisting</p> Signup and view all the answers

What should you always use on bare cadmium plating to prevent corrosion?

<p>A paint system</p> Signup and view all the answers

What is the main purpose of emergency preparations?

<p>Prevent further damage</p> Signup and view all the answers

Under emergency conditions, who is responsible for minimizing damage?

<p>All hands</p> Signup and view all the answers

Which of these is a true statement concerning priority removal?

<p>True</p> Signup and view all the answers

Before starting emergency treatment, it is imperative that which of the following supervise purging or inerting procedures and certify that the aircraft is fire and explosion safe?

<p>Gas Free Engineer (GFE)</p> Signup and view all the answers

Components that are removed from the aircraft are tagged for identification purposes. When tagging components, make sure to indicate which of the following?

<p>Preservation method</p> Signup and view all the answers

Study Notes

Corrosion Control Responsibilities

  • Prevention and control of corrosion on aircraft is the responsibility of command.
  • An effective preventive maintenance program involves keeping low-point drains open.

Importance of Cleaning and Maintenance

  • Regular cleaning allows for thorough inspection of aircraft.
  • Routine scheduled cleaning should not be conducted below 40°F to ensure effectiveness.
  • Daily wipe-down is needed within 3 miles of salt water or when flying below 3,000 feet over salt water.

Cleaning Procedures and Materials

  • Recommended cleaning for exhaust tracks and gun blast deposits is MIL-PRF-85570, Type IV.
  • First step when using a foam cleaning unit is to release pressure.
  • The correct pressure setting for an air regulator on a foam unit is between 30-70 psi.
  • For effective cleaning, use non-woven cleaning cloths to remove foreign matter before lubrication.

Corrosion Prevention and Lubrication

  • Use MIL-L-46010 lubricant to prevent galvanic corrosion on close tolerance fittings.
  • Corrosion preventive compounds protect metal surfaces from corrosive materials.
  • Water displacing corrosion preventive compound forming a clear, dry film is MIL-C-85054.

Evaluation and Inspection of Corrosion

  • Corrosion degrees are categorized as light, moderate, and severe.
  • Light corrosion results in discoloration and pitting not exceeding one mil (0.001 inch).
  • Areas within 36 inches of maintenance activities must be visually inspected for corrosion.

Treatment and Sealants

  • Chemical prepaint treatments, known as chemical films, prepare surfaces for painting.
  • Sealants, such as MIL-A-46146, are intended to prevent moisture intrusion and may take up to 7 days to fully cure.
  • Permanent structures require MIL-PRF-81733 sealant at faying surfaces, while removable structures use Class B sealant.

Safety and Health Considerations

  • Care must be taken to prevent solvent evaporation during application; otherwise, dirt and oil may redeposit.
  • When handling chromic acid, flush with clean water if accidental skin or eye contact occurs.

Surface Preparation and Paint Applications

  • During surface preparation, avoid damaging the structural integrity of materials through abrasion.
  • Thorough cleaning of paint equipment is required immediately after use or every 2 hours.

Emergency Preparations

  • All personnel are responsible for minimizing damage during emergency conditions.
  • Identification tags on removed components must indicate the preservation method used.

Conclusion

  • Understanding proper corrosion control methods, inspection protocols, and maintenance is essential for aircraft safety and longevity. Regular training and adherence to procedures ensure effective management of corrosion-related issues in aviation.

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Description

This quiz covers essential responsibilities for preventing and controlling corrosion on aircraft, including the importance of regular cleaning and maintenance. You'll learn recommended procedures and materials for effective cleaning, as well as lubrication methods to combat corrosion. Test your knowledge on key practices that ensure aircraft safety and longevity.

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