MESA Airlines E-175 Study Guide
(Oxygen system)
Where can O2 pressure be read? Answer - MFD 'STATUS' page (corrected for
temperature)
At the O2 cylinder panel (un-corrected for temperature)
Do the cockpit crew and the passengers share the same emergency oxygen?
Answer - No, the cockpit crew uses an O2 cylinder and the cabin passengers use O2
chemical generators
Once the chemical O2 generators are started can they be shut off? Answer - No!
What is the minimum O2 for a cockpit crew? Answer - 2 crew "Blue for 2"
3 crew "Green for 3"
What activates when the flight deck O2 masks are removed from their storage unit?
Answer - Flow of O2
Mask microphone
Flight deck speakers
What happens if the TEST/RESET button is pressed while the flight deck O2 masks
are not stowed? Answer - Stops flow of O2
Deactivates mask microphone
Deactivates flight deck speakers
What type of oxygen will the quick-donning cockpit crew masks provide? Answer -
Emergency Pure oxygen with positive pressure
100% Pure oxygen at all altitudes
Normal Oxygen/air mixture (ratio depends on cabin altitude)
During preflight how would you know if the cockpit crew O2 has been over
pressurized? Answer - The green blow-out disc would be missing on the forward
right side of the fuselage
What is the O2 duration for the following? Answer - Passenger O2 12 min
Flight Attendant cylinder 30 min
PBE 15 min
