Aircraft Electrical Power System Maintenance
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Questions and Answers

What is the role of the Permanent Magnet Generator (PMG) in the IDG system?

  • Supplying power to the aircraft electrical systems
  • Rectifying electrical output
  • Monitoring oil levels
  • Cooling the alternator (correct)

    • What happens if there is an in-flight oil loss or over temperature condition in the constant-speed drive unit?

  • The CSD re-engages automatically
  • Warning indicator illuminates on the flight deck (correct)
  • The aircraft loses power immediately
  • The cooling oil temperature increases

    • Why does the text mention that the term 'generator' is still used even though these items are brushless alternators?

  • To highlight their cooling features
  • To explain their power output in kVA
  • To discuss their speed of 12,000 rpm
  • To emphasize their function in the IDG system (correct)

    • What is the purpose of the quick attach/detach (QAS) adapter in the CSD and IDG systems?

    <p>To achieve easy connection/disconnection</p> Signup and view all the answers

    Why is it important to monitor the oil level in most constant-speed drives?

    <p>To ensure proper cooling capacity</p> Signup and view all the answers

    What is the significance of the electrically activated generator-drive disconnect mechanism in constant-speed drive units?

    <p>To disengage the CSD in specific situations</p> Signup and view all the answers

    What manuals are referenced for performing maintenance on aircraft electrical systems?

    <p>Aircraft Maintenance Manual, The Wiring Diagrams Manual, Illustrated Parts Catalogue, and component vendor manuals</p> Signup and view all the answers

    Which ATA chapters do transport aircraft maintenance manual systems comply with for electrical power?

    <p>Both ATA 20 Standard Practices and ATA 24 Electrical Power</p> Signup and view all the answers

    How does a typical large aircraft electrical power system supply power?

    <p>Both AC and DC power</p> Signup and view all the answers

    What type of system do aircraft almost without exception use for electrical grounding?

    <p>Negative-grounding system</p> Signup and view all the answers

    What does connecting the negative terminal of the battery to the metallic portion of the aircraft structure achieve?

    <p>Places the structure at a negative potential</p> Signup and view all the answers

    Which manual specifies the compliance with Air Transport Association (ATA) Specification Reference under chapters ATA 20 Standard Practices and ATA 24 Electrical Power?

    <p>Transport Aircraft Maintenance Manual</p> Signup and view all the answers

    What is the purpose of the master switch in the transistorised voltage regulator system?

    <p>To supply initial excitation to the alternator field</p> Signup and view all the answers

    How does the alternator rotor field gain earth in the transistorised voltage regulator system?

    <p>Via biased-on transistor T1</p> Signup and view all the answers

    What causes the charge indicator light to extinguish in the transistorised voltage regulator system?

    <p>Equal potential on each side of the light</p> Signup and view all the answers

    Which component biases transistor T2 on in the transistorised voltage regulator system?

    <p>Zener Diode (ZD)</p> Signup and view all the answers

    What happens when transistor T2 biases on in the transistorised voltage regulator system?

    <p>Causes a voltage drop across R4</p> Signup and view all the answers

    How does the alternator voltage drop occur in the transistorised voltage regulator system?

    <p>When resistors R1, R2, and R3 conduct current</p> Signup and view all the answers

    What is the purpose of a rectifier circuit?

    <p>To convert alternating current into direct current</p> Signup and view all the answers

    What does a tap represent in a transformer winding?

    <p>A wire connection made at some point on a winding</p> Signup and view all the answers

    In a Transformer Rectifier Unit (TRU), what type of input does it typically operate on?

    <p>Three-phase AC input</p> Signup and view all the answers

    How is the output voltage in a rectifier circuit compared to the input voltage?

    <p>Output voltage is always lower than the input voltage</p> Signup and view all the answers

    What component is commonly used in rectifier circuits to allow current flow in only one direction?

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

    What is the frequency of the AC input typically used for Transformer Rectifier Units?

    <p>400 Hz</p> Signup and view all the answers

    What maintains the breaker contacts in the closed position under normal current flow conditions in a Reverse Current Circuit Breaker system?

    <p>Magnetic field set up by the current flow through the RCCR</p> Signup and view all the answers

    What happens to the reverse current circuit breaker when the generator output drops below the battery level?

    <p>Remains closed as current magnitude is low</p> Signup and view all the answers

    Which component of the DC-generating system is supplied power through the auxiliary contacts of the RCCR?

    <p>Generator shunt field circuit</p> Signup and view all the answers

    What is the function of the cut-out relay in a Reverse Current Circuit Breaker system?

    <p>De-energize the line contactor during reverse current flow</p> Signup and view all the answers

    Which action causes the line contactor in a Reverse Current Circuit Breaker system to be de-energized?

    <p>Generator shutdown or output failure</p> Signup and view all the answers

    What keeps the reverse current circuit breaker closed when reverse current flows through the system?

    <p>Current magnitude below trigger value</p> Signup and view all the answers

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