Originally Posted by
UKtravelbear
Separate tickets? It would haveto be as no reputable airline / travel agent would sell you that as the MCT for T3-T2 is 75 minutes
If you think 70 mins is tight then think that allowing for the LH doors close deadline you'll have even less than that.
You have no allowance for the VS flight being late or if the T3-T2 transfer isn't running to time or if there are queues at T2 transfer security.
And when you turn up late at the LH gate they have no obligation to just rebook you for free on the next flight.
Rethink your plans
I think this is too strong a view. The OP's question is whether it's humanly possible, to which the answer is: yes, if the VS flight arrives on time or early.
If it's delayed even a bit, or if there is bad luck with queues at one of the crunch points, then it's very easily missable. But it is possible.
What the OP presumably knows is that he's up a creek if it goes wrong. But it may be that he has an easy way of getting a cheap replacement flight to FRA if needed, whether that's miles, staff travel or whatever. If that's the case, I would go for it.