Urumqi Escape Routes?
Can someone please explain the Urumqi escape routes plotted in dashed lines on the Aerad/Thales upper airways charts?
They all seem to route over the high terrain which is up to 21,000ft?
I presume these are for pax oxygen requirements, but I cant see that they are allowing for further descent?
I'm currently on B744 freighters so not an issue with hours of flight deck oxygen, but it also crossed my mind routing down there recently the 2 eng driftdown consideration if we lost an engine ...