Training under C1/D crew visa
 

Couldn't find another recent tread about it, so, anyone have information if its possible to receive flight and ground training for Ppl/ir/cpl certificates while on layover in the us?
From what i understood since the primary reason for entry is working as a crew on the carrier and leaving 48h later, receiving flight training during the layover, being less than 18h of training wouldn't require the m1.