There are numerous questions and answers about the ability of an APU to provide enough thrust to maintain flight. In contrast, my question is whether the APU, by itself, provides enough thrust to move the plane on the ground. This is what motivates this question --
Back in the 1980s I often flew between Bangkok Thailand and Chiang Mai. It was normally a non-stop. But on one particular flight, it made a stop at a tiny intermediate airport. Looking out out the window (passenger window) I saw that the vehicle parking lot abutted the tarmac with no intervening separator. The parking lot was graveled, and considerable gravel had migrated to the area around the plane.
This seemed to me to be a serious safety hazard for ingestion into the engines, and I wondered whether the APU, by itself, could produce enough thrust to move the plane clear of the gravel.