Domanda 93, Air Law - ATPL - Airline Transport Pilot license

75 hours of instrument time, of which not more than 30 hours may be instrument ground time.
75 hours of instrument time, of which not more than 20 hours of instrument ground time.
150 hours of instrument time, of which not more than 75 hours of instrument ground time.
100 hours of instrument time, of which not more than 30 hours of instrument ground time