posted on Sep, 22 2016 @ 11:42 AM
This appears to be a condition called vortex ring state. The Apache is recovering from a steep descent and recovery where the rotor wash is being
re-ingested in the rotor decreasing lift. This is a common condition that pilots are trained to avoid. It has been a factor in several helicopter
accidents. The helicopter in the Bin Laden raid, several tilt rotor crashes and any time you make fast descents or flight into a confined area...just
my 2 cents.