Aircraft Systems: Stall Warning Computer Operation
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Questions and Answers

What is the primary function of the squat switch or Weight-On-Wheels (WOW) switch in the stall warning system?

  • To control the vane heater element circuit
  • To activate the stick-shaker motor on the ground
  • To monitor the aircraft's airspeed
  • To deactivate the system on the ground (correct)

    • What happens to the relay K when the air-ground switch operates at take-off?

  • It remains in the same state
  • It becomes de-energized (correct)
  • It is disconnected from the power source
  • It becomes energized

    • What is the source of power supply for the sensor synchro?

  • 28-V DC supply
  • DC power source
  • The amplifier
  • AC power source (correct)

    • What is the purpose of the 'bias off' voltage from the relay K?

    <p>To attenuate the signal output from the amplifier</p> Signup and view all the answers

    What triggers the switch SS1 in the stall warning system?

    <p>A voltage from the demodulator</p> Signup and view all the answers

    What happens to the control column when the stick-shaker motor is activated?

    <p>It starts vibrating</p> Signup and view all the answers

    What is a characteristic of platinum's resistance versus temperature function?

    <p>It is very stable and near linear</p> Signup and view all the answers

    What is the purpose of the calibrating or balancing coil in a resistance temperature bulb?

    <p>To achieve a standard constant temperature/resistance characteristic</p> Signup and view all the answers

    What type of material is used to make the casing of a resistance temperature bulb?

    <p>Stainless steel</p> Signup and view all the answers

    Why is the resistance element located at the bottom end of its former in a resistance temperature bulb?

    <p>To reduce the effect of radiation and conduction losses</p> Signup and view all the answers

    What is the name of the network commonly used to measure resistance in a resistance temperature bulb?

    <p>Wheatstone Bridge</p> Signup and view all the answers

    What is a characteristic of both nickel and platinum in terms of their resistance versus temperature function?

    <p>Their resistance increases with an increase in temperature</p> Signup and view all the answers

    What is the name of the technique used to measure the temperature of a body by measuring its radiation?

    <p>Radiation pyrometry</p> Signup and view all the answers

    What is the approximate atmospheric pressure at sea level?

    <p>14.7 psi</p> Signup and view all the answers

    What is the result of atmospheric pressure falling at high altitudes?

    <p>Decrease in oxygen levels</p> Signup and view all the answers

    Why is it important to pressurise the cabin in aircraft?

    <p>To prevent hypoxia</p> Signup and view all the answers

    What is the term for the lack of breathable oxygen at high altitudes?

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

    Why is it important for the pilot and crew to have an accurate indication of cabin altitude?

    <p>To ensure maximum differential pressure conditions</p> Signup and view all the answers

    What is the primary purpose of cabin altimeters in an aircraft?

    <p>To respond to changes in cabin air pressure</p> Signup and view all the answers

    What is the consequence of exceeding the maximum differential pressure between the cabin and outside atmospheric pressure?

    <p>The aircraft can rupture like an over-inflated balloon</p> Signup and view all the answers

    At what altitude is oxygen not necessary for passengers?

    <p>Below 10 000 ft</p> Signup and view all the answers

    What is the purpose of altitude switching units in certain aircraft systems?

    <p>To transmit altitude signals to a separate alerting unit</p> Signup and view all the answers

    What is the typical operating altitude of an aircraft?

    <p>Around 30 000 ft</p> Signup and view all the answers

    What is the primary function of an altitude alerting system?

    <p>To alert the pilot of a possible increase in cabin altitude</p> Signup and view all the answers

    What is the primary function of an accelerometer in non-aerobatic aircraft?

    <p>To measure the loads placed on an airframe during its life</p> Signup and view all the answers

    How is an accelerometer typically calibrated?

    <p>In g units</p> Signup and view all the answers

    What is the purpose of an altitude switching unit?

    <p>To provide a warning when a preset altitude is reached</p> Signup and view all the answers

    Where is an accelerometer typically mounted in an aircraft?

    <p>Near the aircraft's centre of gravity</p> Signup and view all the answers

    What is the unit of measurement for an accelerometer?

    <p>G force</p> Signup and view all the answers

    What is the limitation of incorporating contacts within an indicator?

    <p>It increases the load on the capsule sensing element</p> Signup and view all the answers

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