Minor safety issue
The safety information provided to passengers did not adequately explain that oxygen will flow to the mask without the reservoir bag inflating.
Safety advisory notice
The Australian Transport Safety Bureau advises that operators of transport category aircraft fitted with pressurised gaseous oxygen systems should consider the safety implications of these safety issues, with a view to ensuring that passenger briefings provide sufficient detail and instruction as to the functionality of the system and the actions necessary to appropriately activate the flow of oxygen.