Ghengis
Would you be kind enough to tell me where it is published that pilots of Permit aircraft must remain in sight of the ground?
My aircraft placard says that the a/c may be flown by day under VFR only. As a holder of an IMC rating I may use the ANO definitions for VFR flight outside CAS below FL100, ie 5k/1500m/1000ft, which clearly does not forbid me from flying above a solid deck. Nevertheless I still have to ensure that in getting there and descending I remain VMC (VFR). If I get engine failure then I will possibly break the Law, although I may have considerable mitigation.
PG