Tayyareci wishes to apply logic which seems reasonable to me. This rarely ever happened within the corridors of Kingsway nor ever happened later amongst those at the palace of Gatwick.
However 2+2=4 OR 6-2=4
but also 2+2=4 AND 6-2=4
Take your pick!
excluding approval of first solo flights by day OR by night.
excluding approval of first solo flights by day AND at night.
note the plural of 'flights'. If intended to be one or other condition, that being the first then it would be a singular expression 'flight' whichever was first! But it isn't singular it is plural and so both conditions are excluded as a priviledge to the FI(R).
Just a note for BEagle. A 'Night Validation' is gained during say the training for the PPL but a 'Night Rating' is issued when the priviledge is added after license issue.
'N' reg A/c. I'm pretty sure that quite recently the FAA approved training in a JAA State in 'N' aeroplanes by JAA Instructors as part of the JAA/FAA lets stop falling out and scratch my back i'll scratch yours, kind of thing.