HOW DOES IT WORK?
Bleed air from the engines is continually distributed to the cabin. Outflow valves modulate the exhaust of cabin air to obtain the desired level of pressurization.
DEFINITIONS
- Maximum Differential (max diff): the maximum ratio of cabin pressure to outside (ambient) air pressure that the aircraft can sustain.
- Positive Pressure Relief Valves (Safety Valves): vent excess pressure overboard if max diff is exceeded (prevents overpressurization)
- Negative Pressure Relief Valves: ensure cabin never falls below ambient pressure
- Dump Valves: allow pilots to manually vent in an emergency (i.e. smoke)
- Squat Switch: ensures aircraft is depressurized on the ground
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