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AFS4-2
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AFS4-2

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Questions and Answers

What is the main reason for selecting manual mode in the cabin pressurisation system?

  • To operate the system automatically
  • To carry out high altitude parachute drops or in case of a malfunction in the automatic pressurisation controller (correct)
  • To increase the vacuum pressure
  • To decrease the cabin air pressure

    • What regulates the vacuum pressure in manual mode?

  • The outflow valve
  • The pressurisation control panel
  • The auto/manual control valve
  • The rate control knob (correct)

    • What is the function of the outflow valve in manual mode?

  • To control the discharge rate of the pressurised air (correct)
  • To regulate the vacuum pressure
  • To operate the safety valve
  • To control the cabin altitude

    • What is the result of rapidly operating the manual rate control valve with the aircraft pressurised?

    <p>Extremely high rates of pressurisation change that may cause discomfort, pain, and severe injury</p> Signup and view all the answers

    What is the function of the safety valve?

    <p>To operate independently and sense an over pressurisation of the pressurised cabin</p> Signup and view all the answers

    What is monitored by the aircrew during manual operation?

    <p>Cabin altitude, differential pressure, and rate of change</p> Signup and view all the answers

    What component is NOT part of an electronic cabin pressurisation system?

    <p>Auto/manual control valve</p> Signup and view all the answers

    What is the purpose of the pressurisation control panel in an electronic cabin pressurisation system?

    <p>To monitor and control the pressurisation system</p> Signup and view all the answers

    What is the primary function of the Cabin Pressure Controller?

    <p>To schedule an isobaric or differential mode of operation for maximum passenger comfort</p> Signup and view all the answers

    What is the purpose of the FLT/GND switch?

    <p>To pre-pressurise the aircraft for take-off</p> Signup and view all the answers

    What input serves as a backup to the FLT/GND switch?

    <p>The air/ground (Weight On Wheels) input</p> Signup and view all the answers

    What happens when the Manual AC or Manual DC is selected on the mode selector?

    <p>The green Manual light will illuminate</p> Signup and view all the answers

    What is the purpose of the valve position indicator?

    <p>To check the outflow valve position</p> Signup and view all the answers

    What is the function of the Close/Off/Open toggle switch?

    <p>To move the outflow valve towards the selected position</p> Signup and view all the answers

    In which mode of operation is the cabin pressure control similar to the mechanical (pneumatic) cabin pressure controller?

    <p>Standby mode</p> Signup and view all the answers

    What is the primary difference between the automatic mode and the manual mode?

    <p>The automatic mode does not require crew input</p> Signup and view all the answers

    What is the primary purpose of the differential control range?

    <p>To ensure the structural integrity of the aircraft cabin</p> Signup and view all the answers

    At what altitude does the isobaric range typically end?

    <p>22,000 ft</p> Signup and view all the answers

    What is the name of the valve that opens to maintain maximum pressure at approximately 22,000 ft?

    <p>Outflow valve</p> Signup and view all the answers

    What is the pressure differential experienced by the aircraft at 41,000 ft cruise altitude?

    <p>8.3 PSI</p> Signup and view all the answers

    What is the purpose of the rate/unpressurised range?

    <p>To gradually increase or decrease cabin pressure</p> Signup and view all the answers

    What is the name of the range where the cabin maintains a constant pressure or cabin altitude as the flight altitude changes?

    <p>Isobaric range</p> Signup and view all the answers

    What is the maximum cabin altitude of a typical jet transport aircraft?

    <p>8000 ft</p> Signup and view all the answers

    What is the primary function of the outflow valve?

    <p>To compensate for an increase in aircraft altitude</p> Signup and view all the answers

    What does the cabin altimeter display?

    <p>Cabin altitude above sea level</p> Signup and view all the answers

    What is the unit of measurement displayed on the cabin rate of climb indicator?

    <p>Feet per Minute</p> Signup and view all the answers

    What is the purpose of the cabin rate of climb indicator?

    <p>To display the rate at which the cabin pressure is increasing or decreasing</p> Signup and view all the answers

    How does the cabin rate of climb indicator sense cabin pressure?

    <p>Through a tube connected to the instrument case</p> Signup and view all the answers

    What is the range of the cabin rate of climb indicator?

    <p>0 to 4000 feet per minute</p> Signup and view all the answers

    What happens to the pressure inside the capsule when the cabin pressure decreases?

    <p>It decreases immediately</p> Signup and view all the answers

    What is the function of the restrictor in the cabin rate of climb indicator?

    <p>To allow cabin pressure into the sealed instrument case</p> Signup and view all the answers

    What is the effect of the pressure difference on the capsule in the cabin rate of climb indicator?

    <p>It compresses the capsule</p> Signup and view all the answers

    What is the primary purpose of the pressure reducing valve in the supply inflated seal system?

    <p>To reduce the pressure for seal inflation</p> Signup and view all the answers

    What is the purpose of tapping off air pressure from the main supply line?

    <p>To provide air for seal inflation</p> Signup and view all the answers

    What should be inspected frequently in inflatable rubber seals?

    <p>Cuts, scuffs, trapped objects, and attachment security</p> Signup and view all the answers

    What is the effect of poor sealing on the pressurisation system?

    <p>Decreased efficiency</p> Signup and view all the answers

    What is the difference between self-inflation seals and supply inflated seals?

    <p>Self-inflation seals use air from the cabin, while supply inflated seals use air from a separate source</p> Signup and view all the answers

    What is the purpose of the cabin sealing system?

    <p>To ensure the aircraft is pressurised</p> Signup and view all the answers

    What happens to the air pressure in a supply inflated seal during inflation?

    <p>It increases</p> Signup and view all the answers

    Why is good sealing important in the pressurisation system?

    <p>To ensure the aircraft is pressurised</p> Signup and view all the answers

    Study Notes

    Cabin Pressurisation Ranges

    • The rate/unpressurised range maintains a gradual increase or decrease in cabin pressure until the desired cabin altitude is reached.
    • The isobaric range is defined as the range of cabin pressurisation in which the cabin maintains a constant pressure or cabin altitude as the flight altitude changes.
    • The differential control range is defined as the altitude range where a constant differential pressure is maintained between the cabin pressure and the atmospheric pressure as the aircraft climbs or descends.

    Manual Operation

    • Manual mode can be selected by the aircrew to operate the system manually in case of a malfunction in the automatic pressurisation controller.
    • Manual mode is selected by placing the auto/manual control valve to the MANUAL position.
    • During manual operation, the aircrew continuously monitor the pressurisation indications for cabin altitude, differential pressure, and rate of change.

    Electronic Cabin Pressurisation System

    • An electronic cabin pressurisation control system has the following components: pressurisation control panel, cabin pressure controller, and electrically operated outflow valve.
    • Automatic mode will smoothly control the cabin from before take-off to after landing with little or no further input from the crew.

    Cabin Pressure Indicators

    • The cabin altimeter and differential pressure indicator displays cabin altitude above sea level and the pressure difference between cabin and ambient pressures.
    • The cabin rate of climb indicator displays the rate at which the cabin pressure is increasing (descending) or decreasing (climbing), in Feet per Minute (FPM).

    Cabin Sealing

    • There are two basic methods of sealing aircraft canopies and doors: self-inflation seals and supply-inflated seals.
    • Self-inflation seals use the existing cabin pressure to inflate the seals during pressurisation.
    • Supply-inflated seals require an independent supply of air for their inflation.

    Operational Tests and Precautions

    • The efficiency of pressurisation is dependent on good sealing of the pressure vessel within the aircraft.
    • Inflating rubber seals require frequent inspection for cuts, badly scuffed areas, foreign objects trapped in the channels, and security of attachment to the airframe structure.

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    Description

    This quiz covers the rate/unpressurised range of cabin pressurisation, including gradual increases or decreases in cabin pressure to reach a desired cabin altitude. Learn about aviation technical training.

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