Spray Painting Techniques and Tire Safety Quiz

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Questions and Answers

What is the recommended distance to hold the spray gun from the surface while painting?

  • About 30 cm (12 in.)
  • The distance is not specified in the text.
  • About 10 cm (4 in.)
  • About 20 cm (8 in.) (correct)

What is the purpose of overlapping passes when spraying paint?

  • To create a textured finish.
  • To prevent paint drips from forming.
  • To create a thicker layer of paint.
  • To ensure uniform coverage by blending the paint evenly. (correct)

Why is it important to test the spray gun before painting?

  • To check the air pressure and spray pattern settings. (correct)
  • To make sure the spray gun is properly calibrated before use.
  • To determine the correct drying time for the paint.
  • To ensure the paint is properly mixed.

If the spray gun is not adjusted correctly, which of these issues might occur?

<p>The painted surface might have an uneven finish. (B)</p> Signup and view all the answers

What is the main requirement for preventing corrosion?

<p>Eliminating the presence of an electrolyte. (D)</p> Signup and view all the answers

What is the correct way to move the spray gun when painting a flat surface?

<p>In a straight pass overlapping the previous pass by two thirds. (C)</p> Signup and view all the answers

What is the purpose of painting the edges or corners first?

<p>To create a smooth transition between the edges and the flat surfaces. (A)</p> Signup and view all the answers

Which of the following best describes the type of spray pattern that a correctly adjusted spray gun should produce?

<p>Fan-shaped (D)</p> Signup and view all the answers

What is indicated by the depth of the groove in a tyre tread?

<p>The serviceability of the tyre (D)</p> Signup and view all the answers

What condition can occur due to the movement of the tyre around the rim during heavy braking?

<p>Creep and potential tube damage (C)</p> Signup and view all the answers

Which of the following is a significant indicator of brake wear?

<p>Decrease in the thickness of the brake pack (D)</p> Signup and view all the answers

Which defect is NOT mentioned as affecting tyre conditions?

<p>Excessive heat generation (D)</p> Signup and view all the answers

What can cause defects in aircraft wheels?

<p>Impact damage from heavy landings or runway objects (C)</p> Signup and view all the answers

What occurs to brake rotors if they become excessively hot?

<p>They may break up and lose structural integrity (D)</p> Signup and view all the answers

What is the primary reason for checking brake units between flights?

<p>To identify signs of excessive heating and wear (B)</p> Signup and view all the answers

What indicates that the brake pads need immediate replacement?

<p>Presence of debris and excessive powder with scoring of discs (C)</p> Signup and view all the answers

What is the primary issue indicated by rust on bolt heads and nuts?

<p>A need for maintenance and potential for further corrosion. (B)</p> Signup and view all the answers

Which method is least effective for removing corrosion from lightly stressed areas?

<p>Applying heat guns directly. (C)</p> Signup and view all the answers

When removing corrosion from high-stressed steel components, what is a critical consideration?

<p>Avoiding overheating the parts during the process. (D)</p> Signup and view all the answers

What should be done with cadmium-contaminated waste materials?

<p>They must be treated as industrial waste. (D)</p> Signup and view all the answers

Why is it important to prevent scratching during corrosion removal on highly stressed parts?

<p>Scratches can create points for stress concentration and failure. (D)</p> Signup and view all the answers

Which abrasive method is considered the most effective for removing corrosion products?

<p>Mechanical means such as wire brushing. (A)</p> Signup and view all the answers

What should be the first step before applying any corrosion removal technique?

<p>Degreasing and removing paint as necessary. (B)</p> Signup and view all the answers

What characteristic of the finish should be restored after corrosion removal?

<p>A mirror finish. (A)</p> Signup and view all the answers

What is the significance of inspecting nicks on the leading edge of propeller blades?

<p>They can cause stress concentrations that may lead to blade separation. (B)</p> Signup and view all the answers

Which of the following is NOT considered a life-expired item on an aircraft?

<p>Aircraft lavatory waste system (B)</p> Signup and view all the answers

Where is corrosion most likely to occur on an aircraft?

<p>On magnesium and aluminum alloy surfaces, particularly along rivet lines. (C)</p> Signup and view all the answers

Which condition may indicate a problem during a ground run of an aircraft’s engine?

<p>Unusual engine noises. (C)</p> Signup and view all the answers

What maintenance action is required for aircraft light bulbs with important functions?

<p>Checking them regularly to ensure they remain serviceable. (D)</p> Signup and view all the answers

What component is often monitored and replaced during major servicing due to finite fatigue lives?

<p>Emergency oxygen generators (C)</p> Signup and view all the answers

In terms of propeller maintenance, what is the impact of governor leaks on operation?

<p>They can lead to inconsistent propeller performance. (C)</p> Signup and view all the answers

Which factor should NOT be included in the assessment of propeller blade conditions?

<p>Cosmetic appearance of paint (D)</p> Signup and view all the answers

What type of damage could a panel or door sustain due to excessive use?

<p>Damage to the frame due to items passing through (D)</p> Signup and view all the answers

What should you do if you find corrosion along the seams of a door or panel?

<p>Remove the door or panel to determine the extent of the corrosion (D)</p> Signup and view all the answers

What is the purpose of a frangible device on a protective cover?

<p>To indicate that the system has been operated (D)</p> Signup and view all the answers

How can you identify if a fire extinguisher switch has been operated?

<p>The switch will have a broken wire (C)</p> Signup and view all the answers

What kind of stress is a pressurised structure subjected to?

<p>Cyclic loading or hoop stress (C)</p> Signup and view all the answers

What kind of defects may be indicated by subtle changes in the skin surface of a pressurised structure?

<p>Hidden defects (C)</p> Signup and view all the answers

What should you check around the area where a sheet metal repair has been performed?

<p>For deformation (A)</p> Signup and view all the answers

What is the main purpose of inspecting a pressurised structure?

<p>To ensure the structural integrity of the aircraft (B)</p> Signup and view all the answers

Which of the following is NOT a reason why spilled mercury on aluminium should be cleaned immediately?

<p>It can form a protective layer on the aluminium, preventing further corrosion. (A)</p> Signup and view all the answers

What is the primary reason why alkali spillage is common in NiCad and Ni-Fe batteries?

<p>These battery types use an electrolyte of potassium hydroxide, which is prone to leakage. (D)</p> Signup and view all the answers

What is the effect of mercury amalgamation on aluminium alloys under tension stress?

<p>Reduced ductility. (D)</p> Signup and view all the answers

What is the most devastating effect of mercury spillage on aluminium alloys?

<p>The formation of an amalgam which leads to liquid metal embrittlement. (D)</p> Signup and view all the answers

Which of the following materials is NOT susceptible to corrosion damage from mercury spillage?

<p>Titanium alloys (A)</p> Signup and view all the answers

What is the purpose of painting compartments of batteries with anti-corrosive paint?

<p>To protect the battery casing from corrosion caused by the electrolyte. (D)</p> Signup and view all the answers

X-ray inspection is useful for locating spilled mercury because:

<p>Mercury is a dense material, making it readily visible on X-ray film. (A)</p> Signup and view all the answers

Flashcards

Tyre serviceability

Indicated by the depth of grooves in the tyre tread.

Creep

Movement of the tyre around the rim due to heavy braking.

Retreading tyres

Re-treading can occur if the tyre is not badly damaged.

Brake wear

The reduction in thickness of the brake pack over time.

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Brake overheating

Excessive heat can cause stator material to break up.

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Inspection frequency

Brake units should be inspected between flights for wear and heat signs.

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Indicators of worn brakes

Debris, powder, or scoring on discs suggests brake issues.

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Wheel defects

Usually caused by impact damage or corrosion from landings.

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Panels and Doors

Aircraft components that can vary in size and may be faulty due to wear or damage.

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Corrosion Inspection

Examination for corrosion, especially at fastener holes and seams of doors and panels.

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Quick-release Fasteners

Specialized fasteners used on aircraft doors that require specific tools for operation.

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Emergency System Indication

A mechanism that shows if a protective cover has been opened or operated, often involves frangible devices.

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Pressurized Structure

Aircraft areas that experience pressure differences, requiring careful inspection for stress and damage.

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Fatigue Cracks

Cracks developed due to constant cyclic loading, often found around doors and cut-outs.

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Blow-out Panels

Safety features on aircraft designed to release pressure, needing regular checks for serviceability.

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Sheet Metal Repairs

Repairs to aircraft skin that require evaluating the surrounding structure for hidden damage.

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Propeller Inspection

Inspection process involving nicks, cracks, cleanliness, and lubrication.

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Leading Edge Nicks

Damages on the leading edge of the propeller blade that cause stress.

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Ground Run Checks

Examine engine temperatures, RPM, and unusual noises during ground operations.

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Lifed Items

Components with a specific lifespan that need replacement during servicing.

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Corrosion Prone Areas

Specific locations in aircraft where corrosion is most likely to occur.

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Corrosion in Magnesium & Aluminum

Unique susceptibility to corrosion in magnesium and aluminum alloys.

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Importance of Bulb Checks

Regular checks are vital for light bulbs, especially for safety functions.

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Exhaust Area Corrosion

Corrosion risks in areas exposed to gas turbine and piston engine exhaust.

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Alkali Spillage

Spillage of chemicals from NICAD or Ni-Fe batteries, usually potassium hydroxide.

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Corrective actions for alkali spillage

Neutralizing alkali with chromic acid in water and following health procedures.

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Mercury corrosion on aluminium

Mercury quickly corrodes aluminium, causing pitting and intergranular attack.

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Amalgam formation

Mercury combines with aluminum, leading to liquid metal embrittlement.

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X-ray inspection for mercury

Using X-rays to locate spilled mercury due to its density.

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Effects of mercury spillage

Mercury leakage can damage structures and cause serious corrosion.

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Immediate recovery actions for mercury

Fast isolation and recovery of mercury to prevent damage.

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Protection against mercury penetration

Mercury can breach coatings and finishes, leading to structural damage.

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Rust on hardware

Indicates a need for maintenance and potential corrosion.

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Mechanical removal

The most practical way to control steel corrosion.

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Methods to remove rust

Includes abrasive papers, power buffers, and wire brushes.

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High-stressed components

Corrosion here can be dangerous and requires careful removal.

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Proper finishing

Reapply protective finishes after corrosion removal.

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Cadmium compounds

Toxic dust that can cause serious illness if disturbed.

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Industrial waste disposal

Cadmium-contaminated materials must be properly disposed of.

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Corrosion damage evaluation

Ensure corrosion is within acceptable limits for safety.

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Spray Gun Adjustment

Adjust air pressure and fluid valves for optimal spray pattern.

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Uniform Fan-Shaped Spray

A correctly adjusted spray gun should create a consistent fan shape.

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Spraying Technique

Start painting edges first, moving the gun steadily parallel to the surface.

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Distance from Surface

Hold the spray gun about 20 cm (8 in.) from the surface.

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Overlapping Passes

Each spray pass should overlap the previous by two-thirds for uniform coverage.

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Corrosion Requirements

Corrosion needs an anode, cathode, electrolyte, and electrical contact.

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Eliminating Corrosion

Prevent corrosion by removing one of its basic requirements.

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Spray Pattern Adjustment

Test and adjust the spray pattern before actual painting.

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Study Notes

Module 7: Maintenance Practices - Structural

  • This module covers structural maintenance practices for Category B2 licence holders.
  • It is part of the CASA B2-07d syllabus.
  • The document is controlled.

Knowledge Levels

  • Level 1: Applicant familiarity with basic subject elements and simple descriptions.
    • Applicant should also know typical terms.
  • Level 2: General knowledge of theoretical and practical aspects with an ability to apply the knowledge.
    • Applicant understands theoretical fundamentals and gives general descriptions using examples.
    • Applicant uses mathematical formulas and understands sketches, drawings and schematics related to the subject.
    • Applicant is able to apply knowledge in practical situations using detailed procedures.
  • Level 3: Detailed knowledge of theoretical and practical aspects and logical application.
    • Applicant understands the theory and interrelationships of the subject with other subjects.
    • Applicant provides detailed descriptions using both theoretical fundamentals and examples.
    • Applicant understands math formulas and uses sketches, drawings, and detailed schematics.
    • Applicant applies knowledge in practical situations using manufacturer's instructions.
    • Applicant interprets results and can apply corrective actions based on measurements.

Table of Contents

  • Aircraft Defects, Corrosion Inspection, Assessment Techniques and Reprotection (7.18.1):
    • Learning Objectives
    • Aircraft Defects (General Defects, External Damage, Inlets and Exhausts, Liquid Systems, Gaseous Systems, Visual Inspection Techniques, Dimensions and more)
    • Corrosion Identification, Assessment and Handling (Locations of Corrosion in Aircraft, Exhaust Areas, Engine Intakes and Cooling Air Vents, Landing Gear, Bilge and Water Entrapment Area, and more)
    • Corrosion Removal
    • Paint Removal
  • Aluminium and Aluminum Alloys:
    • Properties, Corrosion attack and treatment
    • Alclad
  • Other Inspections: Components, Fluid lines and hoses, Wiring, Bolts, Rivets, Filters, Screens, Powerplant, Propellers, and more
  • Light Bulbs
  • Metal Parts: Cleanliness and External Evidence of damage, Leaks and discharge, Overheating, Fluid ingress and more
  • Rubber, Fabric, Glass Fibre and Plastic Parts: Cleanliness, Cracks, Deterioration, Overheating, Fluid soakage, Attachment Security and more
  • Control System Components (Cables, Chains, Pulleys, Rods, Tubes): Correct Alignment, Free Movement, Evidence of Wear, Cracks, and more
  • Electrical Components: Cleanliness, Ovious damage, Evidence of overheating, Corrosion and Security of attachments and more
  • External Damage(Inlets and Exhausts): Damage types, common causes of airframe damage, Ground servicing contact risks(vents and holes), and more
  • Liquid Systems: Quantity checks, physical checks, leak investigation, and more
  • Gaseous Systems: Leak detection and the dangers of oxygen leaks
  • Visual Inspection Techniques (Dimensions of parts, condition of tires, wheels, and brakes; locating and resolving specific inspections on an aircraft)
  • Disassembly, Inspection, Repair and Assembly Techniques (7.18.4): Summarize disassembly and reassembly techniques performed during aircraft maintenance
    • Complete Airframes
    • Replacement of Major Components/Modules
    • Replacement of Minor Components/Modules
    • Basic Disassembly and Re-assembly techniques
    • Use of correct tools
    • Disassembly of components, safe removal methods (Jigs)
  • Troubleshooting Techniques (7.18.5): Summarize troubleshooting techniques and process
  • Non-Destructive Testing (7.18.3): Describe the techniques of penetrant, radiographic, eddy current, ultrasonic and borescope methods.
  • Corrosion Prevention and Removal: Best methods, basic concepts and procedures
  • Corrosion Protection (Aluminium Anti-Corrosive Surface Treatments): Cladding, Surface Conversion Coatings, Ferrous Metal Anti-Corrosive Surface Treatments (Nickel and Chrome Plating, Cadmium Plating, Galvanising, and Metal Spraying), and more.
  • Surface Finishing Requirements, Paint (Primer), Wash Primer, or Epoxy
  • Spray Gun Operation; Applying the Finish
  • Corrosion Removal Techniques
  • Paint Removal Techniques
    • General treatment methods, and care steps
  • Assessment for Serviceability, (methods for checking serviceability of various components)

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