- emergency descend
-
aircraft will stop climb
-
request for immediate descend
-
emergency descend without warning
-
no emergency squawk
-
possible turn off track
-
poor RTF (because of oxygen mask)
-
injuries to passengers or crew
A 'Acknowledge' - S 'Separate' - S 'Silence' - I 'Inform' - S 'Support - T 'Time'
- clear airspace directly beneath the aircraft