GTS Mod 6 Specific
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What is the main reason for performing continuous operation with low joule HEIUs?

  • To save energy consumption
  • To increase igniter plug life (correct)
  • To improve aircraft performance
  • To decrease igniter plug life

    • In which scenario would the persistent operation of high joule units be recommended?

  • To maximize energy consumption
  • To minimize maintenance costs (correct)
  • For short flights
  • All of the above

    • What is the primary drawback of using high joule units for continuous operation?

  • Decreased igniter plug life (correct)
  • Improved safety measures
  • Enhanced fuel efficiency
  • Increased aircraft performance

    • Why is it common to use low joule HEIUs for continuous operation?

    <p>To extend the life of the igniter plug</p> Signup and view all the answers

    Which of the following is a possible consequence of using high joule units for continuous operation?

    <p>Shortened lifespan of the igniter plug</p> Signup and view all the answers

    What impact does persistent operation of high joule units have on igniter plug life?

    <p>It shortens the igniter plug life</p> Signup and view all the answers

    What receives power from the DC bus through the fuel shut-off valve circuit breaker?

    <p>Fuel control relay</p> Signup and view all the answers

    Which switch energises the ignition relay in the example discussed?

    <p>16% switch</p> Signup and view all the answers

    Where is the ignition relay usually located?

    <p>In an equipment compartment in the engine nacelle</p> Signup and view all the answers

    What controls fuel scheduling during engine start and deceleration?

    <p>94% switch</p> Signup and view all the answers

    What supplies electrical power to the HEIU?

    <p>Ignition relay</p> Signup and view all the answers

    What de-energises the ignition relay in the speed sensitive control system?

    <p>65% switch</p> Signup and view all the answers

    What is the main function of an aircraft bus?

    <p>Supply electrical power to various components</p> Signup and view all the answers

    How can circuit breakers protect aircraft electrical circuits?

    <p>By preventing short circuits or power surges</p> Signup and view all the answers

    What advantage do circuit breakers have over fuses?

    <p>Circuit breakers give visual indication of circuit limits</p> Signup and view all the answers

    What happens when the white collar becomes exposed in a circuit breaker?

    <p>The circuit is open or disconnected</p> Signup and view all the answers

    What type of power supply do low tension current ignition systems receive?

    <p>DC voltage from the battery bus</p> Signup and view all the answers

    How are high tension current ignition systems powered?

    <p>AC voltage from the aircraft AC bus</p> Signup and view all the answers

    What is the main difference between low tension and high tension current ignition systems?

    <p>The type of power supply they receive</p> Signup and view all the answers

    In terms of duty cycles, what defines an intermittent duty cycle ignition system?

    <p>It has a time limit placed on its operation</p> Signup and view all the answers

    What does the term 'duty cycle' refer to in relation to ignition systems?

    <p>The time limit on operation to prevent damage</p> Signup and view all the answers

    Where does a high tension current ignition system draw its power from?

    <p>Aircraft AC bus</p> Signup and view all the answers

    What is a key advantage of a continuous duty cycle ignition system for aircrew?

    <p>Continuous engine relight capability during critical flight maneuvers</p> Signup and view all the answers

    What is the main difference between AC and DC igniter systems?

    <p>Operating voltages</p> Signup and view all the answers

    Which component is typically found in a dual high energy ignition system for gas turbine engines?

    <p>Dual high energy ignition system</p> Signup and view all the answers

    What is the purpose of the 'fuel control relay' in an ignition system?

    <p>To regulate fuel flow</p> Signup and view all the answers

    In a typical ignition system, what component protects against circuit overloads?

    <p>Circuit breaker</p> Signup and view all the answers

    What is the significance of 'ignition and relight switches' in an ignition system?

    <p>Initiate engine relight sequence</p> Signup and view all the answers

    What is the purpose of the ignition and relight switches in an aircraft?

    <p>To connect bus voltage to the High Energy Ignition Unit (HEIU)</p> Signup and view all the answers

    What is the role of the relight switch in the ignition system?

    <p>To restart engine combustion after an in-flight flame-out</p> Signup and view all the answers

    Which component generates the high voltage necessary for engine ignition?

    <p>High Energy Ignition Unit (HEIU)</p> Signup and view all the answers

    What happens when the relight switch is turned on in an aircraft?

    <p>28 volt DC is directly supplied to the HEIU</p> Signup and view all the answers

    Why is it necessary to have both AC and DC voltage options for the HEIU?

    <p>To optimize ignition under different conditions</p> Signup and view all the answers

    Which part of an aircraft's ignition system receives power directly from the HEIU?

    <p>Igniter Plug</p> Signup and view all the answers

    How do intermittent duty cycle systems differ from continuous duty cycle systems?

    <p>In the duration of operation before switching off</p> Signup and view all the answers

    What is the main concern addressed by implementing a duty cycle for ignition systems?

    <p>Avoiding damage to system components</p> Signup and view all the answers

    How does high joule unit operation impact igniter plug life in an intermittent duty cycle system?

    <p>Decreases igniter plug lifespan</p> Signup and view all the answers

    Which type of duty cycle system would be more suitable for an aircraft that requires frequent engine restarts?

    <p>Intermittent duty cycle system</p> Signup and view all the answers

    In an aircraft, what defines the duration an ignition system can operate without causing harm to its components?

    <p>'Duty cycle'</p> Signup and view all the answers

    What is the duty cycle of the ignition system mentioned in the text?

    <p>2 minutes on, 3 minutes off</p> Signup and view all the answers

    At what RPM range does the ignition system operate continuously?

    <p>16% to 65%</p> Signup and view all the answers

    What is the action of the 'above 65%' switch in the ignition system?

    <p>De-energises the ignition relay</p> Signup and view all the answers

    What happens when the ignition system is de-energised by the 'above 65%' switch?

    <p>Manifold drain valve opens</p> Signup and view all the answers

    What component connects the high tension ignition leads to the igniter plugs?

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

    Which speed-sensitive control system is activated above 65% RPM according to the text?

    <p>'Above 65%' switch</p> Signup and view all the answers

    What is the primary reason for implementing intermittent duty cycle ignition systems in aircraft?

    <p>To manage current draw and prevent overheating during limited periods</p> Signup and view all the answers

    How are intermittent duty cycle ignition systems managed by aircrew?

    <p>Manually by selecting ignition on when needed</p> Signup and view all the answers

    In intermittent duty cycle systems, what happens after the restricted duty cycle based on operating time?

    <p>A cooling off period following the operating time</p> Signup and view all the answers

    Which feature distinguishes intermittent duty cycle ignition systems from continuous duty cycle systems?

    <p>Limited operating time followed by a cooling off period</p> Signup and view all the answers

    How do some aircraft enhance their intermittent duty cycle ignition systems for critical operations like take-off?

    <p>By using additional plugs at full capacity for short periods</p> Signup and view all the answers

    What distinguishes DC and AC igniter systems in terms of components, according to the text?

    <p>Ignition leads</p> Signup and view all the answers

    In a gas turbine engine, what is the purpose of the speed-sensitive control component in the ignition system?

    <p>Ignition and relight switches</p> Signup and view all the answers

    Which component in the typical ignition system ensures proper fuel scheduling during engine start and deceleration?

    <p>Fuel control relay</p> Signup and view all the answers

    What protects aircraft electrical circuits from overload in an ignition system?

    <p>Circuit breaker</p> Signup and view all the answers

    Which component is responsible for generating the high voltage required for engine ignition?

    <p>High energy ignition unit</p> Signup and view all the answers

    What is the primary function of the ignition leads in an aircraft's ignition system?

    <p>Connect high tension ignition leads to igniter plugs</p> Signup and view all the answers

    Where does a low tension current ignition system receive its power from?

    <p>Battery bus</p> Signup and view all the answers

    What determines whether an ignition system is classified as having an intermittent duty cycle or continuous duty cycle?

    <p>Operation time limit</p> Signup and view all the answers

    In an aircraft's ignition system, where are the high-voltage, high-amperage discharges across igniter plugs dissipated?

    <p>Combustion chamber</p> Signup and view all the answers

    What is the primary function of the High Energy Ignition Unit (HEIU) in the ignition system?

    <p>Generate high voltage for engine ignition</p> Signup and view all the answers

    Which component varies in type and position within a combustion chamber in different engine designs?

    <p>Igniter plug</p> Signup and view all the answers

    What is the source of power for high tension current ignition systems in aircraft?

    <p>AC bus</p> Signup and view all the answers

    What is the duty cycle of the ignition system when operating above 65% RPM?

    <p>2 minutes on and 23 minutes off</p> Signup and view all the answers

    Which component de-energises the HEIU, paralleling valve, and manifold drain valve in the ignition system?

    <p>Above 65% switch</p> Signup and view all the answers

    How does the ignition system differ when operating below 65% RPM compared to above 65% RPM?

    <p>It has a different duty cycle</p> Signup and view all the answers

    In the context of the text, what is the purpose of high tension ignition leads?

    <p>To connect the HEIU to the igniter plugs</p> Signup and view all the answers

    What effect does de-energising the ignition relay have on the parallel valve and manifold drain valve?

    <p>They remain closed and inactive</p> Signup and view all the answers

    Which switch is responsible for halting the operation of the ignition system above 65% RPM?

    <p>'Above 65%' switch</p> Signup and view all the answers

    What is the purpose of the trembler mechanism in a DC HEIU?

    <p>To open and close the primary circuit rapidly</p> Signup and view all the answers

    Which component in a DC HEIU extends the duration of spark by delaying the reservoir capacitor discharge?

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

    What does the reservoir capacitor do in a DC HEIU?

    <p>Charges up and discharges high voltage</p> Signup and view all the answers

    In a DC HEIU, what does the glass sealed discharge gap contain?

    <p>Two metallic contacts separated by an air gap</p> Signup and view all the answers

    What is the role of the high voltage rectifier in a DC HEIU?

    <p>To convert AC to DC voltage</p> Signup and view all the answers

    Which component in a DC HEIU converts AC voltage to DC voltage for charging the reservoir capacitor?

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

    What is the function of the High Energy Ignition Unit (HEIU) in an aircraft's ignition system?

    <p>Generates the high voltage required for engine ignition</p> Signup and view all the answers

    Where does an igniter lead connect to in an aircraft's ignition system?

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

    What determines whether the HEIU is supplied with DC or AC voltage?

    <p>The type of HEIU fitted</p> Signup and view all the answers

    In an aircraft's ignition system, what component connects the igniter plug to the High Energy Ignition Unit (HEIU)?

    <p>Igniter lead</p> Signup and view all the answers

    What is the purpose of supplying 28 volt DC directly to the HEIU when the relight switch is closed?

    <p>To continue rotating the engine in case of flame-out</p> Signup and view all the answers

    What occurs when the relight switch is selected to 'on' in an aircraft's ignition system?

    <p>28 volt DC is supplied directly to the HEIU</p> Signup and view all the answers

    What differentiates low tension current systems from high tension current systems in terms of power source?

    <p>Low tension systems are DC voltage systems receiving power from the battery bus, while high tension systems are AC voltage systems receiving power from the aircraft AC bus</p> Signup and view all the answers

    What role does the engine starting system play in relation to the High Energy Ignition Unit (HEIU)?

    <p>It provides a voltage supply to the HEIU</p> Signup and view all the answers

    Which statement accurately describes how the HEIU interacts with igniter plugs during operation?

    <p>HEIU stores energy and dissipates it as a high-voltage discharge across igniter plugs at a predetermined value</p> Signup and view all the answers

    In what way does the High Energy Ignition Unit (HEIU) contribute to engine design variation?

    <p>By influencing the positioning and type of igniter plugs within the combustion chamber</p> Signup and view all the answers

    How do low joule High Energy Ignition Units (HEIUs) differ from high joule units in terms of operation?

    <p>Low joule units prevent damage by operating within restricted duty cycles, unlike high joule units</p> Signup and view all the answers

    Study Notes

    Ignition System Types

    • Two common types of gas turbine ignition systems:
      • Low tension (DC voltage)
      • High tension (AC voltage)

    Ignition System Duty Cycles

    • Two types of duty cycles:
      • Intermittent duty cycle: used for short periods, usually during ground starting
      • Continuous duty cycle: provides continuous engine relight capability during critical flight maneuvers

    Ignition System Components

    • Typical components of an ignition system:
      • DC or AC bus
      • Ignition circuit breaker
      • High Energy Ignition Unit (HEIU)
      • Fuel control relay
      • Ignition relay
      • Speed sensitive control
      • Ignition leads
      • Igniter plugs
      • Ignition and relight switches

    High Energy Ignition Unit (HEIU)

    • Generates high voltage required for engine ignition
    • Can be supplied with either DC or AC voltage
    • Components of a DC HEIU:
      • Induction coil
      • Trembler mechanism
      • Reservoir capacitor
      • Glass sealed discharge gap
      • High voltage rectifier
      • Choke

    Igniter Plugs

    • Types of igniter plugs vary between engine designs
    • Positioned within a combustion chamber

    Ignition Relight Switches

    • Located in the aircraft cabin, near the throttles
    • Connect bus voltage to the HEIUs
    • Allow pilots to regain combustion in case of in-flight flame-out### Ignition System Overview
    • Each system is connected to a High Energy Ignition Unit (HEIU), which receives a voltage supply controlled by the engine starting system.
    • The HEIU stores electrical energy until it reaches a predetermined value, then dissipates it as a high-voltage, high-amperage discharge across an igniter plug or plugs.

    Igniter Plug

    • Igniter plug types and their position within a combustion chamber vary between engine designs.

    Ignition System Types

    • There are two common types of gas turbine ignition systems: low tension (DC voltage) and high tension (AC voltage).

    Low Tension Current (DC) System

    • Receives power from the battery bus.

    High Tension Current (AC) System

    • Receives power from the aircraft AC bus.

    Ignition System Duty Cycles

    • There are two types of ignition system duty cycles: intermittent and continuous.
    • The term 'duty cycle' refers to the time limit placed on the operation of the ignition system to prevent damage to its components.

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    Description

    Test your knowledge on aircraft ignition systems with this quiz. Learn about the operation of high and low joule HEIUs and their impact on igniter plug life. This quiz is a helpful resource for those studying aviation technology or maintenance.

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