Gearboxes in emergency run program why urgent

Recently my fat one is spinning.
The following problem gearbox is in the emergency run program.

Oil measured from the gearbox in the standing position with running engine? Isn't that right?

At idle, my thicker runs at over 1200 u/min.
Isn't it normal?
Faith to think it was under 1000 u/min.

What can be the reason for this?

That's why gears in emergency gear.?
It's already the second time the last time he was standing 2 hours then he turned on again and there was nothing.

Please help me.