Being bored I'll say at least 2 were running because they had the flaps down. The flight blocked as scheduled and from TOD first leveled at 11,000 for a couple minutes than started final approach from 4000', 12 minutes later. If they had fuel issues they left MEM with them. What scenario are you hoping those things lock out 15 seconds before you need them. Too many sims to count and never was putting myself that far down sans gear except for when it was an oops, It will happen and thats why they have that mode of the GPWS.