Aircraft Electrical System Maintenance
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Questions and Answers

What manuals are referenced for aircraft electrical systems maintenance?

  • Airplane Operation Manual, Engineering Design Manual, Safety Procedures Manual, Maintenance logs
  • Service Manuals, Flight Operation Manuals, Pilot Manuals, Cabin Crew Manuals
  • Technical Brochures, Marketing Materials, Customer Support Manuals, Employee Handbooks
  • Aircraft Maintenance Manual, Wiring Diagrams Manual, Illustrated Parts Catalogue, component vendor manuals (correct)

    • Under which chapters of the ATA Specification Reference do transport aircraft maintenance manual systems comply?

  • ATA 50 Cabin Systems and ATA 60 Communications
  • ATA 15 Fuel Systems and ATA 40 Flight Controls
  • ATA 20 Standard Practices and ATA 24 Electrical Power (correct)
  • ATA 10 Engine Systems and ATA 30 Air Conditioning

    • How is the negative terminal of the aircraft battery typically connected?

  • Through an intermediary electrical panel
  • To a separate battery grounding system
  • To a standalone grounding rod
  • Directly to the metallic portion of the aircraft structure (correct)

    • What type of power does a typical large aircraft electrical system make and supply?

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

    What type of system provides normal and emergency power in an aircraft?

    <p>Standby AC and/or DC system</p> Signup and view all the answers

    What is the main function of the charge relief valve in the hydraulic system?

    <p>Regulate the operating pressure of the charge oil system</p> Signup and view all the answers

    Where is the oil cooler located and what does it use to cool the CSD oil?

    <p>Located in the reservoir, uses fan air from the engine</p> Signup and view all the answers

    What is the purpose of a single-wire earth return system in aircraft?

    <p>To provide a return path to the battery through the aircraft structure</p> Signup and view all the answers

    What triggers the opening of the pressure-operated bypass valve in the oil cooler?

    <p>Cold oil reaching a predetermined value</p> Signup and view all the answers

    What happens to the oil that is de-aerated in the hydraulic system reservoir?

    <p>It supplies the charge pump</p> Signup and view all the answers

    What warning does the scavenge filter housing contain to alert of a potential issue?

    <p>Differential Pressure Indicator</p> Signup and view all the answers

    Why is it crucial not to ignore the warning from the differential pressure indicator?

    <p>To check the charge filter for blockage</p> Signup and view all the answers

    What is the function of a Ram Air Turbine (RAT) on twin-engine passenger aircraft?

    <p>To provide emergency hydraulic and electric power</p> Signup and view all the answers

    When does the RAT automatically deploy on some aircraft?

    <p>When both engine-driven generators fail</p> Signup and view all the answers

    What components make up the hydraulic electrical generating system mentioned in the text?

    <p>Hydraulic Constant Speed Motor and AC Generator</p> Signup and view all the answers

    In case both engines or engine-driven hydraulic pumps fail, what supplies hydraulic pressure to the aircraft’s main hydraulic system?

    <p>Ram Air Turbine (RAT)</p> Signup and view all the answers

    What is the purpose of the Constant Speed Motor in the hydraulic electrical generating system?

    <p>To drive the AC generator when the main AC busbars are lost</p> Signup and view all the answers

    What happens if both engine-driven generators fail on an aircraft equipped with a RAT?

    <p>The RAT automatically deploys to provide emergency power</p> Signup and view all the answers

    What is the main function of the harmonic filter in a static inverter?

    <p>Remove everything that is not 400 Hz</p> Signup and view all the answers

    Which component ensures that the correct voltage and frequency are maintained in a static inverter?

    <p>Regulator circuit</p> Signup and view all the answers

    How does a 400 Hz oscillator contribute to a static inverter?

    <p>Produces signals with correct timing</p> Signup and view all the answers

    Why are static inverters now relatively small and lightweight?

    <p>Miniaturisation of electronic components</p> Signup and view all the answers

    What role do transformers play in changing AC voltage and current?

    <p>Using mutual inductance</p> Signup and view all the answers

    Where should static inverters be sent for repair according to the text?

    <p>An approved facility equipped for the work</p> Signup and view all the answers

    What is the purpose of a Bus Tie Breaker (BTB) in a twin-engine split DC bus system?

    <p>To couple the power from one bus to the other if a generator fails</p> Signup and view all the answers

    How is the battery charged in a simple single-generator system?

    <p>From the bus when the generator output is at a higher voltage</p> Signup and view all the answers

    What is the function of a Transformer Rectifier Unit (TRU) in a twin-engine split AC bus system?

    <p>To supply the DC requirements of the aircraft and charge the battery</p> Signup and view all the answers

    If an AC supply fails in an aircraft system, what would the static inverter do?

    <p>Start and provide emergency AC power from the battery</p> Signup and view all the answers

    What occurs in a split bus configuration when one generator fails?

    <p>The failed generator is isolated from its bus and power is coupled to that bus by a Bus Tie Breaker (BTB)</p> Signup and view all the answers

    What is unique about a twin-engine split AC bus system compared to other configurations?

    <p>AC generators supply individual buses which then feed a Transformer Rectifier Unit (TRU)</p> Signup and view all the answers

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