Yes, I was referring to the CRJ crash in Africa recently. I'm surprised that there are so many APR failures in this limited sampling.

I don't have anything remotely technical to research the precise parameters for APR activation, beyond the glossed over pilot level knowledge that we are familiar with. For instance, we know that it makes 500 pounds more thrust. If it failed, could it dump enough fuel for 1,000 pounds thrust? If so, how 'bout 10,000 pounds?

Remember, the same core CF-34 *can* make make beau coup power, as it does in the bigger CRJ's and Air Force A-10. The generic limiting factor are temperatures for duty cycle / cost parameters / metallurgy / maintenance costs.

To make power, air is a constant on the ground, and obviously it was burning, so no further source of ignition is required. That leaves fuel. And fuel is delivered with two inputs; mechanical movement of a lever on the engine's fuel controller, and by a schedule from the APR computer routine.

The thrust lever cables didn't make sense to me, since I assumed that the only place that there was a common failure point was at the actual thrust lever quadrant. It seems that was not a good assumption.

I doubt the fuel SOV's failed to shut the engines down. It's more logical that in the seconds before smashing into the building, they didn't get pushed, or if they did, enough momentum had already propelled the plane and its likely overheated brakes couldn't stop it.

An uncommanded increase in thrust is not a thrust lever cable problem. Stuck at a particular setting, even 100%, sure, but not a change in thrust. If the engines were at a power setting that was low enough for them to even get to the chocks, it doesn't make sense that jammed cables were then able to magically raise that setting, if in fact that's what happened.

Hopefully we'll get more accurate data as to the actual thrust lever angles / power output.

By the way, both the CA and FO were seriously injured in this, either losing or breaking bones in their respective lower extremities. At least one person may have been killed in the ambulance while carrying a passenger (but not necessarily anybody in the ambulance).

Does anybody have the specific inputs to the APR? For instance, WOW is neat, but I'm interested in what makes WOW, etc. (e.g. zero volt equals airborne, 5 volts equals WOW).