Aircraft Maintenance Inspection Quiz

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Questions and Answers

When inspecting aircraft components, what is a primary concern regarding panels, fairings, and fasteners?

  • Measuring the precise weight distribution.
  • Ensuring correct seating and serviceability. (correct)
  • Checking for colour variations.
  • Verifying the original manufacturing date.

What specific type of damage should be inspected on aircraft components?

  • Uniform paint application thickness.
  • Distortion, dents, scores, and chafing. (correct)
  • Accumulation of dust.
  • Presence of approved decals.

What should be checked regarding underfloor areas in aircraft maintenance?

  • Corrosion. (correct)
  • Underfloor cleanliness.
  • Checking the entertainment system wiring.
  • Condition of floor mats.

When inspecting rubber and plastic parts, what characteristic is most important to assess?

<p>Deterioration, crazing, and loss of flexibility. (A)</p> Signup and view all the answers

What is a critical inspection item for electrical cable insulation?

<p>Fluid soakage. (B)</p> Signup and view all the answers

For control system components, what is specifically inspected concerning cables and chains?

<p>Correct alignment – no fouling. (A)</p> Signup and view all the answers

What is checked regarding the electrical bonding of control system components during inspection?

<p>Bonding correctly positioned, undamaged and secure. (D)</p> Signup and view all the answers

In addition to cleanliness, what is a key inspection criterion for aircraft components?

<p>Leaks and discharge. (B)</p> Signup and view all the answers

When are pressure checks typically conducted on aircraft tires, based on the provided information?

<p>Only during line maintenance, troubleshooting, or hangar maintenance. (B)</p> Signup and view all the answers

What primarily indicates the serviceability of an aircraft tire?

<p>The depth of the groove in the tire tread. (D)</p> Signup and view all the answers

What is 'creep' in the context of aircraft tires?

<p>The movement of the tire around the rim due to heavy braking. (D)</p> Signup and view all the answers

What is a potential danger associated with tire creep, especially in tires fitted with a tube?

<p>Tearing of the charging valve out of the tube, causing rapid pressure loss. (A)</p> Signup and view all the answers

How is tire creep typically indicated or monitored on an aircraft wheel?

<p>By observing the alignment of small white marks on the wheel rim and tire sidewall. (B)</p> Signup and view all the answers

What is a common cause of defects in aircraft wheels, according to the information provided?

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

What is the primary concern regarding aircraft brake units during operation?

<p>Dissipating large amounts of energy as heat. (D)</p> Signup and view all the answers

What indicates that the aircraft brake pads are breaking up, requiring complete brake unit replacement?

<p>Signs of debris, excessive amounts of powder, and scoring of the discs. (C)</p> Signup and view all the answers

What material is best suited for masking areas that should not come into contact with paint remover?

<p>Heavy aluminium foil (A)</p> Signup and view all the answers

What type of paint remover consistency is recommended for use on aircraft surfaces?

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

How should a water-rinseable paint remover be applied to aircraft surfaces?

<p>Dabbed with a brush (D)</p> Signup and view all the answers

After the paint remover has been allowed to stand, what visual indication suggests the bond between the paint and metal has been broken?

<p>The paint swells and wrinkles (B)</p> Signup and view all the answers

If a second application of paint remover is needed, what should be done before applying it?

<p>Scrape away old paint (D)</p> Signup and view all the answers

After the finish has swelled and broken away, what should be used to rinse off the surface?

<p>Hot water or steam (B)</p> Signup and view all the answers

What might a broken frangible device on a fire extinguisher switch indicate?

<p>The protective cover has been lifted and the system may have been operated. (A)</p> Signup and view all the answers

Which of the following should be protected from contact with paint removers?

<p>Rubber tyres, hoses, and seals (D)</p> Signup and view all the answers

What should be checked when corrosion is discovered along the seams of doors and panels?

<p>The extent of the corrosion by removing the doors and panels. (B)</p> Signup and view all the answers

What personal protective equipment is necessary when working with paint removers?

<p>Rubber gloves, acid-repellent aprons and goggles (D)</p> Signup and view all the answers

Why do some systems use protective covers over switches?

<p>To prevent inadvertent operation of a switch. (A)</p> Signup and view all the answers

What should you pay particular attention to when checking inside doors and panels?

<p>The fastener holes for dissimilar metal corrosion. (C)</p> Signup and view all the answers

What type of stress can lead to fatigue cracks around doors and other cut-outs in a pressurized structure?

<p>Constant cyclic loading or hoop stress (D)</p> Signup and view all the answers

When repairing sheet metal on a pressurized structure, what should be checked in the surrounding area?

<p>The underlying structure for damage (D)</p> Signup and view all the answers

Which surface finish accelerates corrosion when in contact with mercury?

<p>Bright, polished surfaces (B)</p> Signup and view all the answers

When inspecting a pressurized structure, subtle changes to the skin surface may indicate what?

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

What specific part of the metal structure is attacked by mercury?

<p>The grain boundaries (A)</p> Signup and view all the answers

Besides visual inspection, what other method can be used to check for deformation in a sheet metal repair?

<p>Feeling for deformation, such as wrinkles or buckling (A)</p> Signup and view all the answers

Within how long can complete penetration of freshly scratched aluminium alloy by mercury occur?

<p>3-4 minutes (B)</p> Signup and view all the answers

What type of clothing is recommended to avoid scratching metal surfaces in a mercury contaminated area?

<p>Wing socks (shoe protectors) (A)</p> Signup and view all the answers

Where should contaminated wing socks and protective clothing be disposed?

<p>In unused metal containers outside the aircraft (A)</p> Signup and view all the answers

What cleaning agent is recommended for tools used in mercury-contaminated areas?

<p>Steam or hot water and soap (A)</p> Signup and view all the answers

What should you avoid doing before washing your hands after contacting mercury?

<p>Eating, smoking or blowing your nose (A)</p> Signup and view all the answers

What type of cleaning products should NOT be used on mercury-contaminated areas?

<p>Solvents, solids or polishes (A)</p> Signup and view all the answers

What does a clear, sharp, ringing sound indicate in tap testing?

<p>A well-bonded solid structure (D)</p> Signup and view all the answers

What type of defects can eddy current inspection detect in metals?

<p>Both surface and sub-surface defects (C)</p> Signup and view all the answers

Which of the following is a benefit of using eddy current inspection?

<p>Can differentiate between metals and alloys. (D)</p> Signup and view all the answers

What is the fundamental principle upon which eddy current inspection is based?

<p>AC current acceptance (D)</p> Signup and view all the answers

What does the absolute method in eddy current testing measure?

<p>Material permeability (C)</p> Signup and view all the answers

Which instrument is used in the absolute method of eddy current testing?

<p>Bridge-type eddy current tester (D)</p> Signup and view all the answers

What does the comparison method in eddy current inspection primarily measure?

<p>The conductivity of a metal (B)</p> Signup and view all the answers

How many probes are utilized in the comparison method of eddy current inspection?

<p>Two probes (B)</p> Signup and view all the answers

Flashcards

Masking surfaces

Covering areas to protect them during paint removal.

Water-rinseable paint remover

Paint remover that can be washed off with water after use.

Application method

Dab the remover on surfaces instead of brushing.

Swelling and wrinkling

Signs that the paint is loosening from the surface.

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Reapplication of remover

Applying more remover after scraping stubborn paint.

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Scrubbing with stiff brush

Using a stiff nylon brush to remove remaining paint around details.

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Protection from toxic chemicals

Wearing gloves and goggles to avoid contact with the skin and eyes.

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Signs of aluminium corrosion

Visible effects like white products, etching, or pitting on surfaces.

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Tyre Serviceability

Indicated by the groove depth in the tyre tread.

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Effects of Mercury on Metal

Mercury and its compounds embrittle metal by attacking grain boundaries.

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Tyre Defects

Includes cuts, blisters, creep, and low pressure.

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Contaminated Surface Precautions

Avoid contact with surfaces suspected of mercury contamination.

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Creep

Movement of tyre around the rim due to heavy braking.

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Protective Clothing

Wear disposable clothing and gloves in contaminated areas to protect skin.

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Contaminated Clothing Disposal

Dispose of contaminated clothing in unused metal containers outside the aircraft.

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Indicators of Creep

Small white marks on wheel rim and tyre sidewall.

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Wheel Defects

Often caused by impact damage or corrosion.

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Tools Cleaning Method

Clean tools with steam or hot water and soap after using in contaminated areas.

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Health Risks of Mercury Vapors

Mercury can vaporize at normal temperatures, posing health risks in stagnant air.

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Brake Unit Wear

Occurs due to heat absorption, leading to thickening loss.

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Monitor Brake Thickness

Measured to determine total brake pack wear.

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Avoiding Corrosion Enhancers

Do not use cleaning products on contaminated areas as they may worsen corrosion.

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Safe Hand Practices

Wash hands thoroughly with soap and water after mercury contact and avoid touching metal.

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Immediate Brake Unit Replacement

Required if pads break up or debris is excessive.

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Panels and Doors Damage

Panels and doors can be faulty due to excessive use or damage in frames.

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Corrosion Inspection

Inspect fastener holes for dissimilar metal corrosion, especially areas along seams.

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Quick-Release Fasteners

Different aircraft use varied quick-release fasteners and tools for maintenance.

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Emergency System Indication

Protective covers indicate system operation with broken frangible devices.

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Pressurised Structure Issues

Inspect for fatigue cracks and changes indicating hidden defects.

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Serviceability Check

Evaluate functionality of blow-out panels, doors, windows, and seals.

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Sheet Metal Repair

Check for underlying damage during sheet metal repairs, including corrosion.

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Airframe Symmetry

Measurements ensure airframe symmetry during maintenance activities.

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Inspection Criteria

Aspects that aircraft components are inspected for: cleanliness, damage, leaks, overheating, etc.

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Rubber Parts Inspection

Inspect rubber parts for cleanliness, cracks, and deterioration affecting flexibility.

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Control Systems

Components like cables and chains inspected for alignment, movement, and wear signs.

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Fastener Security

Check the security of fasteners, rivets, and screws for stability in structural components.

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Fluid Ingress

Examine for unwanted fluid entry that might indicate leaks or damage.

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Corrosion Signs

Look for deterioration of protective treatments and evidence of corrosion on parts.

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Overheating Checks

Inspect components for overheating which may indicate malfunction or danger.

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Visual Inspection

A crucial part of aircraft maintenance that involves checking for visible damage like cracks or chafing.

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Tap Testing

A method used to assess the integrity of a solid structure via sound.

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Eddy Current Inspection

An NDI method detecting surface and sub-surface defects in metals using electrical currents.

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Absolute Method

An eddy current technique measuring material permeability to detect defects.

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Comparison Method

An eddy current technique measuring a metal's conductivity using test and reference probes.

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Induced Electromagnetic Field

A field created by electric currents that affects conductive materials.

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Current Acceptance

The measure of how easily a material accepts induced current.

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Conductivity

The ability of a material to allow electric current to flow through it.

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Bridge-Type Eddy Current Tester

A testing instrument used in the absolute method for assessing magnetic permeability.

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Study Notes

Module 7: Maintenance Practices - Structural

  • This module covers structural maintenance practices for Category B2 Licence.
  • It's part of the CASA B2-07d syllabus.
  • Copyright © 2020 Aviation Australia.

Knowledge Levels

  • Level 1: Basic understanding of subject elements.
    • Simple descriptions using common words and examples.
    • Using typical terms.
  • Level 2: General knowledge of the theoretical and practical aspects of the subject.
    • Understanding theoretical fundamentals.
    • Giving general descriptions with examples.
    • Using mathematical formulae with physical laws.
    • Reading and understanding sketches, drawings and schematics.
    • Applying knowledge in a practical way with detailed procedures.
  • Level 3: Detailed knowledge of theoretical and practical subject aspects.
    • Combining and applying knowledge logically and comprehensively.
    • Understanding the theory and interrelationships with other subjects.
    • Detailed descriptions using theoretical fundamentals and specific examples.
    • Using mathematical formulae related to the subject.
    • Reading, understanding and preparing sketches, drawings and schematics.
    • Applying knowledge in a practical way using manufacturer's instructions.
    • Interpreting data from various sources and applying corrective actions.

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
  • Tyres
  • Wheels
  • Brakes
  • Landing Gear Locks
  • Indicators
  • External Probes
  • Handles and Latches
  • Panels and Doors
  • Emergency System Indication
  • Pressurised Structure
  • Other Inspections
  • Locations of Corrosion in Aircraft
  • Prevention of Corrosion
  • Corrosion Removal
  • Paint Removal
  • Aluminium and Aluminium Alloys
  • Alclad
  • Aluminium Alloy Castings and Forgings, Milled Skin Panels, Etc.
  • Ferrous Metals
  • Magnesium Alloys
  • Blend of a Single Depression
  • Blending Ratios
  • Blend of Multiple Corrosion Areas
  • Using a Dial-Type Depth Gauge
  • Acid Spillage
  • Alkali Spillage
  • Metallic Mercury Corrosion on Aluminium Alloys
  • Corrosion Protection
  • Corrosion Removal
  • Paint Removal
  • Aluminium and Aluminium Alloys
  • Alclad
  • Aluminium Alloy Castings and Forgings, Milled Skin Panels, Etc.
  • Ferrous Metals
  • Magnesium Alloys
  • Blend of a Single Depression
  • Blending Ratios
  • Blend of Multiple Corrosion Areas
  • Using a Dial-Type Depth Gauge
  • Corrosion Identification, Assessment and Handling
  • Light Bulbs
  • Control System Components
  • Electrical Components
  • Learning Objectives
  • Etc...

Learning Objectives

  • Various learning objectives within the module related to different sections/ topics of structural maintenance.

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