AC ENVIRONMENT AND AUXILIARY SYSTEM Flashcards
Aircraft are flown at high altitudes for TWO REASONS:
Consumes less fuel
Bad weather and turbulence
It is a process in which conditioned air is pumped into the cabin of an aircraft or spacecraft, in order to create a safe and comfortable environment for passengers and crew flying at high altitudes.
CABIN PRESSURIZATION
This prevents rapid changes of cabin altitude that may be uncomfortable or cause injury to passengers and crew.
CABIN PRESSURIZATION SYSTEM
A cabin pressurization system typically maintains a cabin pressure altitude of approximately __________ at the maximum designed cruising altitude of an aircraft.
8,000 FT.
(2,400 METER)
It is proportional to the pressure outside the aircraft, in order to reduce the stress in the aircraft fuselage.
CABIN PRESSURE
It is maintained while the aircraft is cruising at its max altitude then gradually reduces during the decent of the aircraft, until it matches
the ambient air pressure at the destination.
CABIN PRESSURE
the actual height above sea level at which the aircraft is flying
AIRCRAFT ALTITUDE
the temperature in the area immediately surrounding the aircraft.
AMBIENT TEMPERATURE
the pressure in the area immediately surrounding the aircraft .
AMBIENT PRESSURE
cabin pressure in terms of equivalent altitude above sea level.
CABIN ALTITUDE
the difference in pressure between the pressure acting on one side of a wall and the pressure acting on the other side of the wall
DIFFERENTIAL PRESSURE
PHYSIOLOGICAL PROBLEMS ARISING DUE TO FAILURE OF CABIN PRESSURIZATION
Hypoxia
Altitude sickness
Decompression sickness
Barotrauma
The lower partial pressure of oxygen at altitude reduces the alveolar oxygen tension in the lungs and subsequently in the brain, leading to sluggish thinking, dimmed vision, loss of consciousness, and ultimately death.
HYPOXIA
Hyperventilation, the body’s most common response to hypoxia, does help to partially restore the partial pressure of oxygen in the blood, but it also causes carbon dioxide (CO2) to out-gas, raising the blood pH and inducing alkalosis.
ALTITUDE SICKNESS
The low partial pressure of gases, principally nitrogen (N2) but including all other gases, may cause dissolved gases in the bloodstream to precipitate out, resulting in gas embolism, or bubbles in the bloodstream.
DECOMPRESSION SICKNESS
As the aircraft climbs or descends, passengers may experience discomfort or acute pain as gases trapped within their bodies expand or contract.
BAROTRAUMA
It provides cabin pressure regulation, pressure relief, vacuum relief, and the means for selecting the desired cabin altitude in the isobaric and differential range.
CABIN PRESSURE CONTROL SYSTEM
an outflow valve, and a safety valve are used to accomplish these functions.
CABIN PRESSURE REGULATOR
It controls cabin pressure to a selected
value in the isobaric range and limits cabin pressure to a preset differential value in the differential range.
CABIN PRESSURE REGULATOR
It is used to prevent the maximum differential
pressure, for which the fuselage was designed, from being exceeded.
DIFFERENTIAL CONTROL
It is determined by the structural strength of the cabin and often by the relationship of the cabin size to the probable areas of rupture, such as window areas and doors.
DIFFERENTIAL PRESSURE
It is a combination pressure relief vacuum relief, and dump valve.
CABIN AIR PRESSURE SAFETY VALVE
It prevents cabin pressure from exceeding a pre determined differential pressure above ambient pressure.
PRESSURE RELIEF VALVE
It prevents ambient pressure from exceeding cabin pressure by allowing external air to enter the cabin when ambient pressure exceeds cabin pressure.
VACUUM RELIEF
