Oxygen Flashcards
What differences exist between the oxygen mask testing procedures for the CA/FO and the ACM?
The ACM does not have a dedicated test sliding control or a flow indicator installed on the oxygen mask storage box. The ACM test must be accomplished by momentarily placing the mask in the EMER mode while listening for the flow of oxygen through the speaker on the CA or FO side. One pilot must have their digital audio panel configured as follows: PTT yoke switch set to HOT, BOOM selected out to MASK, SPKR OFF.
Reference: OM Vol. 2, Section 2-16, Controls and Indicators (Puritan Mask), OM Vol. 1, Section 3, Receiving Checklist
How can the crew be assured that the oxygen cylinder pressure regulating shutoff valve is open?
By inspecting the cylinder head located behind the FO seat in the cockpit. This should be accomplished during the cockpit safety inspection.
Reference: OM Vol. 1, Section 3, Receiving Checklist
What supplies oxygen to the flight crew while wearing the oxygen mask?
The fixed oxygen cylinder.
Reference: OM Vol. 2, Section 2-16, Flight Crew Oxygen
When will the passenger oxygen masks drop when the passenger oxygen switch is in the AUTO position?
At cabin altitudes of 14,000 ft, or 14,500 +/- 500 ft (XR).
Reference: OM Vol. 2, Section 2-16, Passenger Oxygen
What is the minimum pressure of the portable oxygen bottle allowed for dispatch?
1200 PSI.
Reference: OM Vol. 2, Section 2-16, Portable Oxygen Cylinder
What will occur if the passenger oxygen selector knob is set to MANUAL?
The oxygen masks will deploy immediately, regardless of cabin altitude. Reference: OM Vol. 2, Section 2-16, Passenger Oxygen
What associated actions occur following the deployment of the passenger oxygen masks?
The NO SMOKING and FASTEN SEAT BELTS sign will automatically be illuminated.
Reference: OM Vol. 2, Section 2-16, Passenger Oxygen
What provides oxygen supply for the passenger oxygen masks?
Oxygen is supplied via chemical oxygen generators.
Reference: OM Vol. 2, Section 2-16, Passenger Oxygen System
What is the purpose of the green discharge indicator on the fuselage, adjacent to the oxygen service panel?
The green discharge indicator provides evidence of over-servicing of the oxygen cylinder if it is missing/blown out.
Reference: OM Vol. 2, Section 2-16, Flight Crew Oxygen
What must occur for the passenger to receive oxygen from the mask?
They must pull downward on the mask to commence the oxygen generation and the flow of oxygen.
Reference: OM Vol. 2, Section 2-16, Passenger Oxygen
What does the OXYGEN LOW PRESS EICAS message indicate?
The message indicates that the crew oxygen system (fixed cylinder) pressure is at or below 400 PSI.
Reference: OM Vol. 2, Section 2-16, Flight Crew Oxygen
