I seconded that.
Go in a taru, slingload a pod (fuel pod for the test) fly and there is a moment your Atrq will be severly damaged.
Or with zeus, direclty spawn a taru and a pod, put the pod under him for slingload without slingloading it, go in the taru put the engine on and almost always the ATRQ will break.
Tested in latest dev build and normal fly mode.
In facts seems that the hitpoint HitVRotor be the problem.
Another problem seems that it cant be damaged by firing on the rotor too...