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17- A220 O2 and Emergency Equipment
Questions with Detailed Verified Answers
Question: Name the three different oxygen systems onboard the A220
Ans✅ ✅: Flight Deck Oxygen, Cabin Oxygen and portable oxygen.
Question: What microphones disable and enable once the mask
stowage box doors are
opened?
Ans✅ ✅: The headset and handset microphones are inhibited, and the oxygen mask
microphone is automatically enabled.
Question: What is the function of the N/100% oxygen supply lever in N
(Normal)?
Ans✅ ✅: The regulator supplies a mixture of oxygen and cabin air to the mask.
At 35000ft the air inlet on the regulator closes and 100% pure oxygen will
be delivered regardless of selector position.
Question: What are the two functions of the O2 PRESS TO TEST AND
RESET control lever?
Ans✅ ✅: It allows the testing of oxygen flow without removing the mask. It also
closes the flow of oxygen after usage and resets the microphone to enable headset
communication.
Question: What is the location of the overboard discharge indicator?
Ans✅ ✅: Located on the lower left side of the fuselage by the ground
servicing panel.
Question: What is the normal cylinder pressure for the cabin oxygen
system?
17- A220 O2 and Emergency Equipment
Questions with Detailed Verified Answers
Question: Name the three different oxygen systems onboard the A220
Ans✅ ✅: Flight Deck Oxygen, Cabin Oxygen and portable oxygen.
Question: What microphones disable and enable once the mask
stowage box doors are
opened?
Ans✅ ✅: The headset and handset microphones are inhibited, and the oxygen mask
microphone is automatically enabled.
Question: What is the function of the N/100% oxygen supply lever in N
(Normal)?
Ans✅ ✅: The regulator supplies a mixture of oxygen and cabin air to the mask.
At 35000ft the air inlet on the regulator closes and 100% pure oxygen will
be delivered regardless of selector position.
Question: What are the two functions of the O2 PRESS TO TEST AND
RESET control lever?
Ans✅ ✅: It allows the testing of oxygen flow without removing the mask. It also
closes the flow of oxygen after usage and resets the microphone to enable headset
communication.
Question: What is the location of the overboard discharge indicator?
Ans✅ ✅: Located on the lower left side of the fuselage by the ground
servicing panel.
Question: What is the normal cylinder pressure for the cabin oxygen
system?
