sim training is not involved in air commerce, no 24 hrs off in seven days, no rest requirements, but once you go back to line flying you must do a look back and ensure all items are covered.
Sim training is no different than doing Jepps, office work, cleaning the plane, washing the DO's car or on standby and required to be available for duty.
If you are required to work (in any capacity) by your employer (the certificate holder) then you are not in rest. In which case you must still have to be able to "look back" 24 hrs and have 10 hours of rest documented before flying the line.
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