Commercial Fixed Wing
Situational Awareness; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Vehicle
General None Reported / Taken
Human Factors
I hooked up the tow bar and pushback tractor and continued helping my crew load the flight. Last minute freight arrived at the gate and I jumped in the back pit to load the 5 or 6 boxes that came late. Got out; went to the front of the plane to get on the headset. Once I started pushing out; about 5 seconds into the push I noticed the plane become disconnected from the tug. At this point I didn't know what to tell the pilot because in training I wasn't presented with this type situation or informed the proper verbiage to relay to pilot. I continued to drive with the plane so I wouldn't disconnect the headset from the plane and lose all communication with pilot. Once I [saw] the plane coming to a stop I slowed and came to a stop as well. The plane rolled back onto the push tractor.
Tractor driver reported failing to communicate with the pilot due to lack of training when the aircraft disconnected from the tractor during pushback.