I did ~ > 12,500 AMSL in an R22 in Johannesburg as part of flight training.....
(that's less than 9,000' above ground required safety margin for auto's (which took a long time down, btw
))
Airfield elevation ~ 5200'.
I didn't pay too much attention to the specific altitude at the time as I thought it was a standard training exercise...
Feels like the only flying I did there > 500 ft above ground
