Questions and Answers
What is the primary cause of galvanic corrosion?
What type of corrosion is most likely to occur when two surfaces fit tightly together but can move relative to one another?
Which of the following best describes the compound created when metal reacts with an electrolyte in galvanic corrosion?
What triggers the rust or corrosion in most metals?
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In terms of galvanic action, what happens to the more anodic metal?
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What is a potential consequence of fretting corrosion in assembled metal parts?
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When sheets of aluminum alloy are riveted together, which condition is ideal to prevent corrosion?
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What role does the environment play in galvanic corrosion?
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What is corrosion primarily caused by?
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Which of the following metals is least likely to corrode?
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Which components are included in the useful load of an aircraft?
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How is the empty weight of an aircraft defined?
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If an aircraft has an empty weight of 2,100 pounds and specific adjustments are made, how would you determine the new empty weight CG?
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In what scenario does intergranular corrosion occur?
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What should not be included in the useful load calculation?
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Which process converts metals into oxides, hydroxides, or sulfates?
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What drilling technique is generally recommended for stainless steel compared to aluminum alloy sheet?
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What is the term used to describe the length of time a catalyzed resin remains workable?
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Which type of plastic material can soften or flow when reheated?
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Which classification is used for high tensile strength fiberglass in aircraft structures?
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What is the primary purpose of E-glass in aircraft applications?
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How does drilling stainless steel compare to drilling aluminum alloy in terms of pressure applied?
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What is the core material of Alclad 2024-T4?
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What distinguishes S-glass from E-glass in terms of application?
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What material is rolled onto the surfaces of Alclad 2024-T4 for corrosion protection?
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Which factor is essential to consider when drilling stainless steel to optimize performance?
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Which heat treatment process produces a hard, wear-resistant surface over a strong core?
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Which of the following best describes the outcome of the annealing process?
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What is the primary characteristic of the tempering process?
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Normalizing heat treatment is applicable to which type of metal?
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Which process below is specifically designed to harden the surface of steel?
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What effect does stress relief have on metals?
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What is the new empty weight CG after installing a seat and safety belt as well as radio equipment?
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What is the empty weight CG of the aircraft with 20 pounds of potable water and 23 pounds of hydraulic fluid included?
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Which weight is included when calculating the empty weight of an aircraft?
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If the potable water is not part of the required equipment, how does this affect the new empty weight?
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What is one method to determine an aircraft's empty weight if the previous records are lost?
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What happens if the aircraft’s weight and balance records are found to be inaccurate?
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What does the moment of 885,957 indicate in the context of aircraft weight?
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What weight was on board when the aircraft was weighed for empty weight purposes?
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Study Notes
Materials and Processes
- Alclad 2024-T4 consists of a core of heat-treated 2024-T4 aluminum alloy and a surface layer of commercially pure aluminum for corrosion protection.
- Case hardening enhances surface hardness while maintaining toughness in the core; often used for steel.
- Annealing softens metal, while tempering reduces brittleness by removing some hardness.
- Normalizing can treat both aluminum alloys and iron-base metals to achieve desired properties.
Corrosion Types
- Galvanic corrosion occurs due to contact between dissimilar metals in the presence of an electrolyte, leading to one metal corroding preferentially.
- Fretting corrosion manifests between tightly fitting assembled parts with minor relative motion, leading to wear and loss of protective coatings.
- Most metal corrosion is a result of their tendency to revert to a natural state, forming compounds like oxides.
Weight and Balance
- The useful load of an aircraft is the sum of crew, usable fuel, passengers, and cargo, calculated from maximum allowable gross weight minus empty weight.
- Alterations affecting empty weight and center of gravity (CG) require precise calculations to determine new CG positions.
- Empty weight CG can change based on modifications; calculations must consider any removed or added components.
- Accurate empty weight can be obtained by reweighing the aircraft or referencing type certification data sheet if records are lost.
Machining Techniques
- Stainless steel drilling requires lower speeds and more pressure compared to aluminum to achieve optimal results.
- A drill with a larger included angle is preferred for drilling stainless steel.
Resins and Composites
- Pot life refers to the duration a catalyzed resin remains workable; important for composite manufacturing.
- Thermoplastics can be re-molded under heat; contrasting thermoset materials do not soften upon reheating.
- Two glass fibers utilized in aircraft structures are E-glass (for electrical insulation) and S-glass (higher tensile strength for structural applications).
Fire Safety
- Detection of thermal discharge in built-in fire-extinguisher systems ensures effective monitoring and safety in aircraft.
Key Variables in Aircraft Design
- Important to maintain proper aircraft weight balance for safety, performance, and control.
- Factors like equipment weight and passenger loads critically influence overall aircraft performance.
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Description
This quiz covers the essential materials and processes related to metal corrosion, including various types and treatment methods. It addresses key concepts like Alclad 2024-T4, case hardening, and corrosion types such as galvanic and fretting corrosion. Test your knowledge on these vital principles in metallurgy and aircraft weight and balance.
