OXYGEN MASKS-BUYERS BEWARE
At the risk of boring you all f
tless I can't resist this thread any longer.
Knowing that a "Q" facepiece is the small size and "P" the large size is correct but these facepieces are common to a wide range of oxygen masks used in conjunction with different oxygen systems.
To my knowledge "P AND Q" masks have been in use for at least 42 years and at one time there were about 50 variations with numerous modifications depending on aircraft type.
Variations can include:-
Oxygen connectors.
Oxygen hose lengths.
Microphone types.
Exspiratory valves
Anti-suffocation valves
Oxygen mask attachment (Chain- perrypin chain- wire cable and headset adjustable type)
They have been used with non-compatable oxygen systems:-
Pressure Demand.
Mini-man mounted (remember them ?) V and T masks
Economiser system (Replaces the old "H" masks. now "QH" and "PH" uses "P and Q" facepieces but with simple inlet and outlet valves. )
CONFUSED? Good !
Hopefully no-one would attempt to use an oxygen mask obtained from "e- bay" for flying use
and not many people have their own "Fast Jet"
Initial post and rant over