Title: Describe environmental control systems.
Course: Aircraft Pilot Training II (20053-II) > Section: Operating the Aircraft

Description should include the following:

- Continuous-flow oxygen systems are usually provided for passengers.
- The passenger mask typically has a reservoir bag that collects oxygen from the continuous-flow oxygen system during the time when the mask user is exhaling.
- The oxygen collected in the reservoir bag allows a higher aspiratory flow rate during the inhalation cycle, which reduces the amount of air dilution.
- Ambient air is added to the supplied oxygen during inhalation after the reservoir bag oxygen supply is depleted.
- The exhaled air is released to the cabin.

PLT190