GTS Mod 3
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Questions and Answers

What is the purpose of a chip detector in an aircraft lubrication system?

  • To monitor fuel flow
  • To measure oil pressure
  • To collect ferrous debris from scavenged oil (correct)
  • To regulate temperature in the oil system

    • How do chip detectors indicate the presence of ferrous material in the oil?

  • By emitting a visual warning signal
  • By releasing a scented alert
  • By bridging an open electrical circuit (correct)
  • By generating a high-pitched sound

    • Where can temperature transmitters be located based on the design of the system?

  • In the oil supply or scavenge line (correct)
  • In the control tower
  • In the fuel tank
  • In the landing gear

    • What does completing an electrical circuit in a chip detector trigger?

    <p>A warning light in the cockpit</p> Signup and view all the answers

    In Figure 26, what type of transmitter and indicator is shown?

    <p>Temperature transmitter</p> Signup and view all the answers

    Where are chip detectors typically located within an aircraft lubrication system?

    <p>In the oil flow with ferrous material</p> Signup and view all the answers

    How does a cyclonic breather operate?

    <p>By directing oil-laden air into the separator cylinder at an angle to create a cyclonic flow pattern</p> Signup and view all the answers

    What happens to the oil in a cyclonic breather?

    <p>Forced to the sides of the housing and settles at the bottom of the separator cylinder</p> Signup and view all the answers

    What allows oil to drain to a sump in a cyclonic breather?

    <p>Drain holes at the bottom of the separator cylinder</p> Signup and view all the answers

    How do oil temperature transmitters work?

    <p>Sensing oil temperature and transmitting a signal to an indicator</p> Signup and view all the answers

    What changes as oil temperature changes in an oil temperature transmitter?

    <p>The electrical resistance of the transmitter</p> Signup and view all the answers

    What is the primary purpose of the oil cooler flap thermostat?

    <p>Regulate oil flow through the air cooled oil cooler</p> Signup and view all the answers

    Where is the oil cooler flap thermostat located?

    <p>Downstream of the oil cooler</p> Signup and view all the answers

    What does manual operation of the oil cooler flap allow for?

    <p>Adjust airflow by moving the flap open or closed</p> Signup and view all the answers

    In what circumstances can the oil cooler flap be manually driven towards closed?

    <p>To close off airflow</p> Signup and view all the answers

    Which component is responsible for sensing oil temperature leaving the cooler?

    <p>Oil cooler thermostat</p> Signup and view all the answers

    What is the purpose of moving the flap actuator by the oil cooler thermostat?

    <p>To maintain correct airflow</p> Signup and view all the answers

    What happens as the drive gear rotates and pulls the driven gear around in a gerotor pump?

    <p>The expanding cavity is under the inlet port and fluid is drawn in</p> Signup and view all the answers

    What is the primary function of a metering pump in an aircraft lubrication system?

    <p>To supply a metered amount of oil to bearings</p> Signup and view all the answers

    What role do gerotor pumps play in oil systems on aircraft?

    <p>Keeping oil consumption at a required level</p> Signup and view all the answers

    What distinguishes metering pumps from other types of pumps in aircraft lubrication systems?

    <p>They supply a specific and controlled amount of oil</p> Signup and view all the answers

    Where are metering pumps commonly utilized in aircraft systems?

    <p>Turbine and compressor shaft bearings</p> Signup and view all the answers

    What is the function of the gears in gear pumps for aircraft lubrication systems?

    <p>To draw oil into the pump and deliver it to the outlet side</p> Signup and view all the answers

    What is the purpose of the bronze bushes in gear pumps used in aircraft lubrication systems?

    <p>To reduce friction between the gears and the housing</p> Signup and view all the answers

    Which part of a gear pump in an aircraft lubrication system has a relief slot machined in it to prevent hydraulic locking?

    <p>End of each tooth</p> Signup and view all the answers

    What is the significant advantage of using gear pumps in aircraft lubrication systems?

    <p>Constant oil flow regardless of engine speed</p> Signup and view all the answers

    What distinguishes the gerotor pump type from other delivery pump types in aircraft lubrication systems?

    <p>It has a variable displacement design</p> Signup and view all the answers

    What is the main difference between a vane pump and a gerotor pump?

    <p>Gerotor pumps force oil out of the pump as the space near the inlet diminishes.</p> Signup and view all the answers

    Which component distinguishes a gerotor pump from a vane pump?

    <p>Lobe shaped gear</p> Signup and view all the answers

    How does a gerotor pump differ from a vane pump in terms of operation?

    <p>A gerotor pump rotates freely in the housing, while a vane pump has an eccentric rotor.</p> Signup and view all the answers

    Why are vane pumps considered to be lighter than gear and gerotor type pumps?

    <p>Gear and gerotor pumps are heavier due to additional components.</p> Signup and view all the answers

    What is the primary function of a gear pump within an aircraft lubrication system?

    <p>Receiving oil from the oil tank for distribution through the lubrication system</p> Signup and view all the answers

    In a gear pump assembly containing both delivery and scavenge elements, why is the scavenge element typically larger?

    <p>To handle the hotter return oil coming from main bearings</p> Signup and view all the answers

    Which component usually provides oil supply to the delivery element in a gear pump?

    <p>Oil tank</p> Signup and view all the answers

    What distinguishes the driven gears in a duplex gear pump assembly?

    <p>They are located on separate shafts</p> Signup and view all the answers

    How do gear pumps differ from other types of pumps typically used in aircraft systems?

    <p>Gear pumps have separate compartments for delivery and scavenge elements</p> Signup and view all the answers

    What fills the space between the opposing piston and metering pin in the metering pump?

    <p>Oil from the delivery pump</p> Signup and view all the answers

    How does the movement of the cam against the pumping piston affect the inlet port?

    <p>It covers the inlet port periodically</p> Signup and view all the answers

    Why are scavenge pumps larger in capacity compared to pressure pumps?

    <p>To accommodate heat expansion and aeration</p> Signup and view all the answers

    What assists in moving scavenge oil from some parts of engines in the lubrication system?

    <p>Bearing cavity pressure</p> Signup and view all the answers

    What do engine oil system filters primarily remove from the lubrication system?

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

    What is the purpose of the double-element gear pump in the power section oil pump?

    <p>To regulate oil pressure at 55+/-5 PSI</p> Signup and view all the answers

    What is the function of the adjustable pressure regulating valve in the power section oil pump?

    <p>To prevent excessive back-pressure at the pump outlet</p> Signup and view all the answers

    What does the bypass valve on the power section oil pump allow for?

    <p>Prevention of excessive back-pressure at the pump outlet</p> Signup and view all the answers

    When does the check valve within the system operate in relation to pressure?

    <p>Within a range of 6–10 PSI</p> Signup and view all the answers

    Where does oil enter after passing through the filter assembly in the delivery oil flow path?

    <p>Into annular ring formed by air inlet housing and compressor extension shaft housing</p> Signup and view all the answers

    Where is the oil picked up by the second element of the pump?

    <p>From the sump in the inner combustion casing liner</p> Signup and view all the answers

    What does the accessory gearbox in the context of gear pumps mainly function as?

    <p>A sump for the entire engine system</p> Signup and view all the answers

    Which component of the powerplant serves as a breather system's main vent to atmosphere?

    <p>Torquemeter assembly</p> Signup and view all the answers

    What is the primary function of the main scavenge pump in the engine system?

    <p>To scavenge oil from various components like compressor extension shaft and front bearing</p> Signup and view all the answers

    Where is the power section breather mounted within the powerplant?

    <p>On top of the air inlet housing</p> Signup and view all the answers

    What is the pathway for oil draining from the compressor front bearing to reach the accessory gearbox?

    <p>Through a tube that ports oil out through the bottom vertical strut into the accessory gearbox</p> Signup and view all the answers

    What is the function of a breather system with respect to an engine's oil system?

    <p>To vent air from the oil system to atmosphere</p> Signup and view all the answers

    What is the role of the air inlet housing in relation to oil drainage within the engine system?

    <p>To enable drainage through vertical struts into the accessory gearbox</p> Signup and view all the answers

    Which component of an aircraft engine system primarily acts as a lubricant carrier?

    <p>Main Scavenge Pump</p> Signup and view all the answers

    How does an accessory gearbox contribute to maintaining proper lubrication within an engine system?

    <p>By serving as a sump and lubricating various drive shaft bearings</p> Signup and view all the answers

    Study Notes

    Lubrication System Components

    • Temperature transmitters:
      • Located in oil supply or scavenge line
      • Sense oil temperature and transmit signal to cockpit indicator
      • Change in current flow corresponds to temperature change
    • Chip detectors and magnetic plugs:
      • Installed in lubrication system to collect ferrous debris from scavenged oil
      • Enable early identification of engine internal failure
      • Chip detectors are permanent magnets that protrude into oil flow and collect ferrous material
      • Bridging of electrical circuit by metal chips triggers cockpit indication

    Breathers

    • Centrifugal breather:
      • Uses air/oil mist entry holes to separate oil from air
      • Oil is forced to sides of housing and settles at bottom of separator cylinder
      • Drain holes at bottom of separator cylinder allow oil to drain to sump
    • Cyclonic breather:
      • Directs oil-laden air into separator cylinder at an angle to create cyclonic flow pattern
      • Swirling pattern creates separation of oil from air
      • Oil is forced to sides of cyclonic breather housing and settles at bottom of separator cylinder

    Pumps

    • Metering pump:
      • Supplies metered or regulated amount of oil to bearings on turbine and compressor shafts
      • Used in partial and total loss oil systems
      • Ensures oil consumption is kept to required level while supplying adequate oil to bearings
    • Delivery oil pump:
      • Driven by engine and usually located on accessory drive gearbox
      • Supplies oil to parts of engine that require lubrication
      • Types: gear, vane, gerotor, and metering
    • Scavenge pump:
      • Returns oil from lubrication points to oil tank
      • Passages that scavenge oil follows vary between engines; typically include filtration, cooling, and de-aeration
      • Bearing cavity pressure assists movement of scavenge oil from some parts of engines

    Gear Pumps

    • Consist of two steel gears with one driven by engine or power supply
    • Other gear meshes with and is driven by drive gear
    • Bronze bushes enclosed in closely fitted housing support each gear
    • Oil is drawn into pump and carried round between teeth and case, and delivered to outlet side of pump

    Vane Pumps

    • Consist of rotor drive-shaft, eccentric rotor, sliding vanes, and pump housing
    • Space between vanes and case fills with oil as it passes inlet
    • Oil is carried towards outlet and forced out of pump as space near outlet diminishes
    • More tolerant of oil-borne debris than other types of pumps and lighter than gear and gerotor type pumps

    Gerotor Pumps

    • Use similar principle to vane pump
    • Consist of lobe-shaped gear, rotor, and pump housing
    • Gear rides inside rotor, which rotates freely within housing
    • Multi-tooth eccentric spur drive gear is turned by accessory drive from engine
    • Rotates multi-tooth internal gear rotor as it turns

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    Test your knowledge on aircraft temperature transmitters and indicators. Learn about the locations where temperature transmitters can be found in an aircraft's oil supply or scavenge line.

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