AFS6
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Questions and Answers

What is the primary reason for consulting standing instructions when preparing an aircraft for testing or troubleshooting?

  • To ensure compliance with local safety and maintenance requirements (correct)
  • To determine the isolation tags attached to the system
  • To position GSE safely
  • To identify the source of power for the test

    • What should be done to the area to be inspected prior to testing or troubleshooting?

  • Pull maintenance circuit breakers
  • Cordon off the area with rope
  • Position GSE in the area
  • Clean the area (correct)

    • Why is it essential to brief the maintenance team on testing/troubleshooting procedures?

  • To avoid mistakes and ensure a safe testing or troubleshooting environment (correct)
  • To prevent non-essential personnel from entering the work area
  • To determine the isolation tags attached to the system
  • To ensure proper use of GSE

    • What should maintenance personnel do with maintenance circuit breakers prior to testing or troubleshooting?

    <p>Pull and then reset them according to the maintenance manual</p> Signup and view all the answers

    What is the purpose of having spill kits available during testing or troubleshooting?

    <p>In case of leaks or spills during testing or troubleshooting</p> Signup and view all the answers

    What should be done with unions prior to applying pressure during testing or troubleshooting?

    <p>Torque them</p> Signup and view all the answers

    What is the purpose of positioning GSE during testing or troubleshooting?

    <p>To position the GSE where it will not impede testing or place personnel in danger</p> Signup and view all the answers

    What is the primary source of guidance for maintenance personnel during testing or troubleshooting?

    <p>The maintenance manual</p> Signup and view all the answers

    When should hydraulic components and systems be tested?

    <p>Any time a component has been disturbed, adjusted or changed</p> Signup and view all the answers

    What type of pump can be used to operationally check the hydraulic system on an aircraft?

    <p>Electrically driven auxiliary pump or a portable hydraulic test rig</p> Signup and view all the answers

    Where are hydraulic components that have been removed from the aircraft typically examined and tested?

    <p>At an authorised maintenance facility</p> Signup and view all the answers

    What is checked during functional testing of a reassembled hydraulic component?

    <p>Internal and external leakage, and cycled through a full range of movement</p> Signup and view all the answers

    What information is displayed on an ECAM hydraulic system synoptic display?

    <p>Flow lines, digital representation of hydraulic pressure, and hydraulic pump status</p> Signup and view all the answers

    What does the LO symbol indicate on an ECAM hydraulic system synoptic display?

    <p>Low hydraulic quantity</p> Signup and view all the answers

    Why is it important to test hydraulic components and systems?

    <p>To ensure safe operation and prevent accidents</p> Signup and view all the answers

    Where are break-down parts of a hydraulic component examined?

    <p>At an authorised maintenance facility</p> Signup and view all the answers

    What is the purpose of a pressure relief test?

    <p>To ensure excess cabin pressure is vented to atmosphere</p> Signup and view all the answers

    What is the nominal value of cabin pressure used for a fighter aircraft during a static pressure check?

    <p>5.0 PSI</p> Signup and view all the answers

    What is the purpose of the manual dump system?

    <p>To vent excess pressure to atmosphere in an over-pressure condition</p> Signup and view all the answers

    What is checked during a cabin static pressure check?

    <p>The integrity of aircraft pressure vessel structure and its sealing</p> Signup and view all the answers

    What is the purpose of the safety valve?

    <p>To vent excess cabin pressure to atmosphere</p> Signup and view all the answers

    What is checked during a pressure relief test?

    <p>The automatic operation of the safety valve and the manual dump system</p> Signup and view all the answers

    What is the nominal value of cabin pressure used for a passenger aircraft during a static pressure check?

    <p>10.92 PSI</p> Signup and view all the answers

    What is inspected during a cabin static pressure check?

    <p>The aircraft's exterior</p> Signup and view all the answers

    What is the primary purpose of troubleshooting in an aircraft?

    <p>To identify and repair faulty systems</p> Signup and view all the answers

    During configuration of an aircraft for troubleshooting a hydraulic system, which of the following practices is NOT recommended?

    <p>Applying pressure to the system without proper precautions</p> Signup and view all the answers

    What is the primary purpose of fuel systems examination?

    <p>To identify leaks in the system</p> Signup and view all the answers

    What is the most likely cause of damage to boost pumps during testing?

    <p>Sudden changes in pressure during testing</p> Signup and view all the answers

    When are water drain tests typically conducted?

    <p>After a fuel system repair</p> Signup and view all the answers

    What is a common problem associated with fuel transfer checks?

    <p>Inaccurate fuel level readings</p> Signup and view all the answers

    Referring to Figure 3, what could be a possible cause of a fuel tank reading empty and another tank reading full?

    <p>Incorrect fuel level sensor calibration</p> Signup and view all the answers

    What is the purpose of having two people on board large aircraft during pressurisation checks?

    <p>To provide additional safety during testing</p> Signup and view all the answers

    What is a primary concern when examining ECS components?

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

    What should be done to the system if it operates correctly in manual mode?

    <p>Check the system again in auto mode</p> Signup and view all the answers

    What is a possible cause of cabin temperature being too high or too low?

    <p>Defective temperature sensor</p> Signup and view all the answers

    What should be done to the temperature sensor if it is defective?

    <p>Replace the sensor with a serviceable item</p> Signup and view all the answers

    What should be checked for during the examination of ECS components?

    <p>Security, leakage, cracked or loose mounting brackets, and duct or component chafing</p> Signup and view all the answers

    What is the purpose of the troubleshooting tables in the ECS fault-finding scenarios?

    <p>To provide basic air-conditioning fault-finding scenarios</p> Signup and view all the answers

    What should be done if the system operates correctly in manual mode but not in auto mode?

    <p>Check the system again in auto mode</p> Signup and view all the answers

    What is a possible correction for a cabin temperature that is too high or too low?

    <p>Replace the temperature sensor with a serviceable item</p> Signup and view all the answers

    Study Notes

    Preparing Aircraft for Testing or Troubleshooting

    • Consult standing instructions to ensure compliance with local safety and maintenance requirements
    • Ensure all unions are torqued prior to applying pressure
    • Clean the area to be inspected and rope off the area if necessary to prevent non-essential personnel from entering the work area
    • Pull and reset maintenance circuit breakers according to the maintenance manual
    • Use the prescribed source of power according to the maintenance manual
    • Position Ground Support Equipment (GSE) to avoid impeding testing or placing personnel in danger
    • Have spill kits available in case of leaks
    • Brief the maintenance team on testing and troubleshooting procedures before commencing maintenance
    • Use an appropriate source of communication

    Hydraulic System Testing and Troubleshooting

    • Perform testing and troubleshooting according to the manufacturer's instructions and at specified intervals
    • Test hydraulic components and systems after any disturbance, adjustment, or change
    • Conduct operational checks on the aircraft using an engine-driven pump, electrically driven auxiliary pump, or portable hydraulic test rig
    • Examine and test removed components at an authorized maintenance facility
    • Functionally test components on a hydraulic test bench after reassembly

    ECAM Display for Hydraulics

    • Displays flow lines, hydraulic flow, and position of hydraulic system valves
    • Displays digital representation of hydraulic pressure and a sliding scale representing quantity
    • Displays hydraulic pump status

    ECS Component Examination

    • Examine ECS components for security, evidence of leakage, cracked or loose mounting brackets, duct or component chafing, and frayed or torn insulation blankets
    • Ensure ducting is securely attached and adequately supported, and insulation blankets are in good repair and secure around the ducting

    Fault-Finding Scenarios

    • Cabin temperature too high or too low may be caused by defective temperature sensor or controller
    • Defective temperature sensor or controller can be corrected by replacing the temperature sensor with a serviceable item

    Pressure Relief and Dump Valve Check

    • Perform a pressure relief test to ensure excess cabin pressure is vented to atmosphere in case of an over-pressure condition
    • Check automatic operation of the safety valve and manual dump system to ensure excess pressure is vented to atmosphere

    Cabin Static Pressure Check

    • Perform a static pressure check to confirm the integrity of aircraft pressure vessel structure and sealing
    • Pressurize the aircraft with a constant supply of air at a set pressure value (e.g. 5.0 PSI for a fighter aircraft or 10.92 PSI for a passenger aircraft)
    • Check the aircraft exterior for cracks, distortion, bulges, and rivet condition

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    Description

    Best practices to follow when preparing an aircraft for testing or troubleshooting, including ensuring compliance with safety and maintenance requirements and preparing the work area.

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