Other / Unknown
Deviation / Discrepancy - Procedural Other / Unknown; Ground Event / Encounter Aircraft
Aircraft Aircraft Damaged; General Flight Cancelled / Delayed
Human Factors
I was on the pushback; Captain said push to spot Tango. I started the push pushing straight back tail toward the service road; stopped; and put the [tug] in reverse and started to turn towards the spot going counterclockwise. Mid-way through the push the wing walker on my left side threw up the stop signal and we stopped there for about 2 minutes.  Then the wing walker on my left side gave me the all clear by this time the Number 2 engine was going.  About 7 seconds after he gave me the clear he gave the stop signal again. During those 7 seconds I turned my head for a moment since I was going in reverse.  I stopped but by then it was too late and I was notified that the left winglet of the aircraft I was pushing rubbed up against the aft wing of the parked aircraft on the next gate.
Tug driver reports the left winglet of the aircraft he is pushing back contacting the horizontal stabilizer of a parked aircraft at the adjacent gate. The wing walker had signaled stop but was not noticed until too late.