Can you use the “French Day” figure?

According to the regulatory point ORO.FTL.110:

At the expense of compliance with the requirements of ORO.FTL.110, it is permissible for the operator to schedule days, other than days off, on which in principle there is no assigned activity, but where activity may be assigned well in advance (which must be defined in the MO). An activity assignment on a “free day” would be a change in programming, and should be accounted for. When considering a change in programming, the activation of a “franco” must be carried out in accordance with all the considerations of change established by the operator (minimum antelations, means of contact, etc.).