Airframe Structures
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Questions and Answers

What is Zone 320 under the ATA system?

  • Horizontal stabiliser
  • Central fuselage
  • Vertical stabiliser (correct)
  • Wing tip

    • During a bonding check, what is the maximum resistance between a component and earth?

  • 0.005 ohms
  • 1/50 ohms
  • 5 ohms
  • 50 milliohms (correct)

    • How is damage to the nose cone of an aircraft prevented during a lightning strike?

  • Earthing Strap
  • Bonding Strip (correct)
  • Static discharge wick
  • Aluminum foil

    • What type of stress is tension related to?

    <p>Elongating or stretch</p> Signup and view all the answers

    What is a Fuselage Station primarily used for?

    <p>Longitudinal point on the aircraft fuselage</p> Signup and view all the answers

    How are composite materials typically bonded?

    <p>Special paint</p> Signup and view all the answers

    Which of the following is NOT a part of the aircraft location system?

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

    What type of stress is experienced by the pressure cabin?

    <p>Hoop stress</p> Signup and view all the answers

    What is the purpose of diverter strips on the radome?

    <p>To protect from lightning strike</p> Signup and view all the answers

    Which of the following is an example of a fail-safe structure?

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

    What does the designation FS245, RWS45 represent?

    <p>245 inches from the datum line and 45 inches from the right wing centerline</p> Signup and view all the answers

    What type of design allows for certain damage to go unrepaired between scheduled maintenance?

    <p>Damage-tolerant design</p> Signup and view all the answers

    What type of stress is experienced by an I-beam?

    <p>All of the above</p> Signup and view all the answers

    Which ATA Zone designation would be assigned to the passenger entry door?

    <p>800</p> Signup and view all the answers

    How is damage to the nose cone of an aircraft prevented during a lightning strike?

    <p>Bonding Strip</p> Signup and view all the answers

    What is the purpose of a Fuselage Station?

    <p>Determine longitudinal points on the aircraft fuselage</p> Signup and view all the answers

    How are composite materials typically bonded?

    <p>Special paint</p> Signup and view all the answers

    What type of stress is tension related to?

    <p>Elongating or stretch</p> Signup and view all the answers

    Which component would be located in Zone 320 under the ATA system?

    <p>Vertical Stabilizer</p> Signup and view all the answers

    What is the correct answer for the term 'shear' in the context of aircraft structures?

    <p>Strain is the correct term</p> Signup and view all the answers

    What type of aircraft construction offers good damage resistance?

    <p>Semi-monocoque construction</p> Signup and view all the answers

    How are water lines (WLs) measured on an aircraft?

    <p>On a vertical line</p> Signup and view all the answers

    What is the purpose of bonding on an aircraft?

    <p>To maintain all parts at the same potential</p> Signup and view all the answers

    What factor governs the ultimate fatigue life of an aircraft?

    <p>Flying hours</p> Signup and view all the answers

    What are the main forces acting on an aircraft structure?

    <p>Tension, compression, torsion and shear</p> Signup and view all the answers

    How is the life of an aircraft structure counted?

    <p>By pressurization cycles</p> Signup and view all the answers

    What does a sprayed coat of non-conductive paint prevent in an aircraft?

    <p>Electrical conduction</p> Signup and view all the answers

    Which type of stress is primarily resisted by a structural member known as a 'strut'?

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

    What does an aircraft structure with multiple load paths embody?

    <p>Fail-safe design</p> Signup and view all the answers

    What does wrinkling of the skin on the upper surface of the fuselage typically indicate?

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

    In case a redundant structure fails, what does it become?

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

    Which classification would a structure fall under if it has a high designed reserve strength?

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

    What is the role of the water line in aircraft measurements?

    <p>Datum for vertical locations</p> Signup and view all the answers

    'Lateral stations' in an aircraft have station zero at the:

    <p>'Centre line'</p> Signup and view all the answers

    Which ATA Zone refers to the lower fuselage?

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

    Which type of stress is an I-beam primarily subjected to?

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

    How is a radome protected from static electricity build-up?

    <p>Conductive paint</p> Signup and view all the answers

    Which of these is used to locate precise points on an aircraft?

    <p>Frame stations, water lines, and buttock lines</p> Signup and view all the answers

    Which of these is an example of a fail-safe structure?

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

    What does damage tolerant design allow for?

    <p>Certain damage to go unrepaired between maintenance</p> Signup and view all the answers

    Under the ATA 100 zonal system, what designation would the passenger entry door have?

    <p>800</p> Signup and view all the answers

    Which area of an aircraft is primarily subjected to hoop stress?

    <p>Pressure cabin</p> Signup and view all the answers

    How is shear stress best described?

    <p>Forces acting to cause slippage between planes</p> Signup and view all the answers

    Which option correctly describes secondary structures?

    <p>Parts that are highly stressed but will not cause aircraft failure if damaged</p> Signup and view all the answers

    What does the term 'failsafe' refer to in aircraft structure design?

    <p>A design with built-in redundancy to prevent complete failure if one component fails</p> Signup and view all the answers

    What is the definition of stress according to the text?

    <p>The load per unit area acting on a material</p> Signup and view all the answers

    What type of structural item must be replaced at a specified time or cycle count, regardless of its condition?

    <p>Safe-life</p> Signup and view all the answers

    If unable to classify a structure as primary or secondary, what action should be taken according to the text?

    <p>Upgrade it to primary</p> Signup and view all the answers

    What does the term 'safe-life' refer to in aircraft structural design?

    <p>The maximum number of flying hours before a major structural failure occurs</p> Signup and view all the answers

    What combination of stresses makes up bending stress?

    <p>Tension and compression</p> Signup and view all the answers

    Which Airworthiness Notice refers to structural surveys?

    <p>Notice 89</p> Signup and view all the answers

    Who normally calls up structural survey inspections?

    <p>The manufacturer</p> Signup and view all the answers

    Where are wing stations measured from on an aircraft?

    <p>Butt Line (BL)</p> Signup and view all the answers

    Study Notes

    Aircraft Structure and Maintenance

    • ATA Zone 100 refers to the lower fuselage (below floor)
    • Bonding lead to a remote aircraft component must be 0.5 in wide
    • An I-beam is subjected to bending, with different parts subject to tension (upper boom) and shear (the web)
    • A radome is protected from static electricity build-up by conductive paint
    • Precise points are located on an aircraft by a system of frame stations, water lines, and buttock lines
    • A stringer is an example of a fail-safe structure
    • Damage tolerant design allows for certain damage to the structure to go un-repaired between scheduled maintenance
    • In the ATA 100 zonal system, the passenger entry door will have a designation of 800
    • The pressure cabin is subject to hoop stress
    • Shear stress is described as slipping away under the action of forces
    • The ground cable must be a single strand copper wire 0.5 in cross-sectional area
    • FS245, RWS45 refers to a point 245 inches from the datum line of the aircraft and 45 inches from the centreline of the right wing
    • The radome is protected from lightning strike by diverter strips
    • When shorting the two prongs with the single prong of a bonding tester together, the gauge will read zero

    Materials and Structures

    • Tension is the stress of elongating or stretching
    • A fuselage station is a longitudinal point on the aircraft fuselage
    • Composite materials are bonded by special paint
    • Semi-monocoque construction offers good damage resistance
    • Wing stations are measured outboard from the fuselage centreline
    • A tie rod is designed to accept tensile loads
    • Primary structure has multiple load paths, making it a fail-safe design
    • A redundant structure is a fail-safe structure

    Safety and Airworthiness

    • Airworthiness requirements for large aircraft are found in CS 25
    • An Anthropomorphic Test Dummy (ATD) is used to test aircraft structure and seating mount points for structural integrity
    • The bonding lead to a remote aircraft component must be 0.5 in wide

    Measurement and Location Systems

    • Fuselage station numbers are measured in inches from the front of the aircraft

    • Water Lines (WLs) are measured points on a vertical line

    • Buttock lines are measurements from the centre line

    • Lateral stations have station zero at the centre line### Aircraft Structures Classification

    • Secondary structures are lightly stressed parts of the airframe, such as fairings, wheel shields, and minor component brackets, that will not cause failure of the aircraft if damaged.

    Redundancy in Aircraft Structures

    • A structure with built-in redundancy is called failsafe, meaning it can still function even if one part fails.

    Stress and Material Properties

    • Stress is the load per unit area acting on a material.
    • Stress can cause deformation of a material, but it is not the same as deformation.

    Structure Replacement and Classification

    • A piece of structure that must be replaced at a specified number of cycles, flying hours, or years, regardless of its physical condition, is classified as safe-life.
    • If a structure classification is unclear, it should be upgraded to primary as a precaution.

    Safe-Life and Structural Failure

    • Safe-life is the maximum number of flying hours that should elapse before a major structural failure occurs.

    Bending Stresses

    • Bending stresses are a combination of tension and compression stresses.

    Airworthiness and Structural Surveys

    • The Airworthiness Notice that refers to structural surveys is Notice 89.
    • Structural survey inspections are normally called up by the manufacturer.

    Wing Station Measurement

    • Wing stations are measured from the Butt Line (BL).

    Zonal Locations

    • Zone 323 is located at the tip of the vertical stabilizer.

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    Description

    Test your knowledge on aircraft maintenance with questions about the ATA system, bonding checks, and more. Identify correct answers and explanations for each question to enhance your understanding of the subject.

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