CASA Part 66: Exploded Views in Aviation Assembly Drawings
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Questions and Answers

What is the nominal size of a component?

  • The upper deviation of the basic size of a component
  • The difference between the maximum and minimum limits of a component
  • The actual size of the component as annotated in the drawing or blueprint (correct)
  • The lower deviation of the basic size of a component

    • What is the purpose of assigning tolerances to mating parts?

  • To allow for interchangeable parts and permit the replacement of individual parts (correct)
  • To reduce the total cost of production
  • To ensure that parts are manufactured with exact precision
  • To increase the overall weight of the system

    • What is a system in terms of tolerance?

  • A machine with multiple components
  • Two or more mating parts (correct)
  • A set of non-mating parts with different tolerances
  • A single component with a specific tolerance

    • What is geometric tolerance?

    <p>A note referring to specific conditions</p> Signup and view all the answers

    What is unilateral tolerance?

    <p>A type of tolerance where a target dimension is given along with a tolerance</p> Signup and view all the answers

    What is the difference between the maximum and minimum limits of basic or nominal size?

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

    What is the primary purpose of using a reference edge in aircraft drawings?

    <p>To minimize cumulative errors in measuring hole locations</p> Signup and view all the answers

    How are holes typically located on an aircraft drawing?

    <p>With reference to one corner of the part</p> Signup and view all the answers

    What is the advantage of writing dimensions perpendicular to the dimension lines?

    <p>It allows for easier reading of dimensions</p> Signup and view all the answers

    What is the primary reference tool for aviation maintenance engineers?

    <p>Manufacturer's Maintenance Manual</p> Signup and view all the answers

    What type of errors can occur when measuring holes from the centre of the adjacent hole?

    <p>Cumulative errors</p> Signup and view all the answers

    Why are manufacturer's manuals considered acceptable data?

    <p>Because they are provided by the aircraft manufacturer</p> Signup and view all the answers

    What is the primary goal of International Standards and ISO Standards?

    <p>To ensure materials, products, processes, and services are fit for their purpose</p> Signup and view all the answers

    What is the structure of the maintenance reference system divided into?

    <p>ATA 100 chapters</p> Signup and view all the answers

    How many national standards bodies are part of the International Organization for Standardization (ISO)?

    <p>Over 140</p> Signup and view all the answers

    What is the purpose of international guidelines and standards in aviation maintenance?

    <p>To complement product or service requirements stated in company specifications</p> Signup and view all the answers

    What is the range of chapters in the maintenance reference system that provides detailed information on each subject?

    <p>Chapters 00 to 23</p> Signup and view all the answers

    What is the role of the International Organization for Standardization (ISO) in aviation maintenance?

    <p>To publish international guidelines and standards</p> Signup and view all the answers

    What is the primary purpose of exploded view drawings in illustrated parts drawings?

    <p>To display every part in an assembly in their relative positions and expanded outwards</p> Signup and view all the answers

    Which type of sectional drawing illustrates simple items with no interior parts?

    <p>Revolved section</p> Signup and view all the answers

    What is the function of a cutting plane line in a removed section drawing?

    <p>To separate the object into two parts to show the internal shape</p> Signup and view all the answers

    What is the advantage of a half-sectional view drawing?

    <p>It allows the inside and outside of a part to be seen at the same time</p> Signup and view all the answers

    Which type of drawing is often used in assembly drawings and installation drawings?

    <p>Exploded view drawing</p> Signup and view all the answers

    What is the purpose of the reference number in an exploded view drawing?

    <p>To identify a part on the parts list</p> Signup and view all the answers

    What is the purpose of the Portable Maintenance Aid?

    <p>To assist aeroplane mechanics in digital troubleshooting</p> Signup and view all the answers

    Why was the ATA specification issued?

    <p>To correct the disuniformity among different publications</p> Signup and view all the answers

    How are the technical data of an aircraft's systems organised?

    <p>Into individual systems which are numbered</p> Signup and view all the answers

    What is the designation of the fire protection system under the ATA 100 specifications?

    <p>Chapter 26</p> Signup and view all the answers

    What is the purpose of the subsystem numbering?

    <p>To provide a detailed breakdown of each system</p> Signup and view all the answers

    What is the result of the ATA specification?

    <p>Maintenance information for all transport aircraft is arranged in the same way</p> Signup and view all the answers

    Study Notes

    Allowance and Tolerance

    • Nominal size is the actual size of the component as annotated in the drawing or blueprint.
    • Tolerance is the difference between the maximum and minimum limits of basic or nominal size.
    • Tolerance is also the difference between the upper and lower deviations in basic or nominal size.
    • Tolerances are assigned to mating parts.

    Tolerance Types

    • Tolerances can be expressed as direct limits, or as tolerance values applied directly to a dimension.
    • Types of tolerance include:
      • Limit tolerance (upper and lower dimensional sizes are stacked on top of each other)
      • Unilateral tolerance (a target dimension is given along with a tolerance)
      • Bilateral tolerance

    Drawing Dimensioning

    • Most aircraft drawings are dimensioned using a reference edge from which all dimensions are made.
    • Holes are typically located with reference to one corner of a part.
    • Two ways of placing dimensions on a drawing:
      • Writing all dimensions perpendicular to the dimension lines.
      • Writing all dimensions parallel to the bottom of the drawing.

    Manufacturer's Publications

    • Aircraft manufacturers provide various manuals with their products to assist engineers in inspection, maintenance, and repair.
    • Manufacturer's manuals are acceptable data.
    • The engineer must use these manuals when performing maintenance.

    Aircraft Maintenance Manual

    • The primary reference tool for aviation maintenance engineers working on aircraft.
    • Divided into chapters, with similar information found in each chapter.

    ATA 100 Chapter Structure

    • Chapters 00 to 23, with each chapter covering a specific subject.
    • Examples of chapters include:
      • 23: continued from previous page
      • 28 to 116: no specific subjects listed

    International Standards

    • International Standards and ISO Standards are documented agreements containing technical specifications or other precise criteria.
    • Goal is to ensure that materials, products, processes, and services are fit for their purpose.

    ISO

    • International Organization for Standardization (ISO) is a worldwide federation of national standards bodies.
    • ISO publishes International Standards to complement product or service requirements stated in company specifications.

    Drawing Types

    • Exploded view drawings:
      • Show every part in an assembly.
      • Parts are in their relative positions and expanded outwards.
      • Each part is identified by its physical appearance and reference number.
    • Sectional drawings:
      • Four types: Revolved section, Removed section, Half section, Complete section.
      • Used to illustrate the internal shape of a part.

    ATA Specification 100

    • ATA Specification calls for organizing an aircraft's technical data into individual systems, which are numbered.
    • Each system has provisions for subsystem numbering.
    • Example: fire protection system is designated as Chapter 26 under the ATA 100 specifications.

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    Related Documents

    Engineering Drawing, Diagrams, and Standards PDF

    Description

    Understand the concept of exploded views in illustrated parts drawings, used to show every part in an assembly. Learn how to identify parts by their physical appearance and reference number. This quiz is based on the CASA Part 66 Training Materials for Aviation Maintenance Practices.

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