Oxygen Systems

Question 1

(757) How many portable oxygen bottles are found onboard and where are they
located?

Answer 1

Two portable oxygen cylinders assemblies are installed in

the lavatory

Question 2

(767) Where can the portable oxygen bottles be found onboard (PRM not installed)?

Answer 2

1 ‐ Lavatory, 1 ‐ Adjacent to Supernumerary seats, 1 ‐

Above Cargo Access Door

Question 3

During preflight, what should the NORMAL/100% switch on the O2 mask should be
set to?

Answer 3

100%

Question 4

What is the maximum drop in O2 pressure during preflight?

Answer 4

100 PSI

Question 5

Quick donning full face Diluter‐Demand oxygen masks are installed in which
positions?

Answer 5

Captain, First Officer, and First Observer