Dry thrust is normal jet engine power without using an afterburner. Max dry thrust is the engine's most powerful thrust level without afterburner.
But what if the engine is at half power, or even idle power? Can you safely engage afterburner at that point?
I'm interested in turbojets and turbofans. Both can have an afterburner. I'm wondering if it's possible to engage afterburner on both of them at a time when the engine is not already at full dry thrust.
Edit: one reason it might not work is that idle thrust might not be powerful enough to ignite the fuel in the afterburner.
The reason I ask is for emergencies. Jet engines need several seconds to spool up from idle to full thrust. If you could engage afterburner from the get-go, you could be up to max speed much quicker.