Narrative:

We were parked in the overflow area for ZZZ. We were to taxi between a pc-12 on the right and a caravan on the left; it was a rather tight fit; but it looked doable. We needed to pull forward to make a tight right turn to go in between the 2 aircraft. We had 1 ramp employee wing walking on the left side; between the caravan and our aircraft. He was giving a thumbs up/all clear signal so I continued to move forward. By the time I was given the stop signal; I did not have enough time to come to a stop; resulting in contact between my left wing tip and the tail of the caravan. I then came to a stop and shut down the engine. After shutting; I addressed the passengers and then exited the aircraft to inspect the damage. The left wingtip of our aircraft had a small scratch; but no other damage was visible. The tail of the caravan has a sizable dent on the underside of the tail where it made contact with the wing. After talking to the ramp employee; he said that he attempted to give us a stop signal; but knew it was too late. He also said he attempted to stop the aircraft by grabbing it with his arm; resulting in a bruise on his left forearm. As for a more detailed step by step of the incident:after startup and the before taxi checklist; I flashed my taxi light to indicate we were ready to begin taxi. The single lineman was not directly in front of our aircraft; but standing just to the right; directly behind the tail of the caravan. He didn't give the typical 'move forward' motion with his arms; just a thumbs up to indicate we were good to start moving. I released the brake and began moving forward a few feet; before turning to right towards the taxiway and the gap between the aircraft. The first officer was focused on the right wing; announcing a 'clear right'. As my left wing approached the caravan; the lineman gave thumbs up indicating we were clear of the other aircraft; so I announced 'clear left'. I looked forward and briefly looked to the right to assess the distance. As I looked back to the left; from my perspective it looked clear; but a little close; so I attempted to slow down and turn to the right. This is when I was given a stop signal; but as I began applying the brakes is when the wing made contact with tail of the caravan. [I] suggest more wing walkers when taxiing out of the overflow area in ZZZ.

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Original NASA ASRS Text

Title: PC-12 flight crew reported a ground collision with another aircraft while maneuvering in overflow parking.

Narrative: We were parked in the overflow area for ZZZ. We were to taxi between a PC-12 on the right and a Caravan on the left; it was a rather tight fit; but it looked doable. We needed to pull forward to make a tight right turn to go in between the 2 aircraft. We had 1 ramp employee wing walking on the left side; between the Caravan and our aircraft. He was giving a thumbs up/all clear signal so I continued to move forward. By the time I was given the stop signal; I did not have enough time to come to a stop; resulting in contact between my left wing tip and the tail of the Caravan. I then came to a stop and shut down the engine. After shutting; I addressed the passengers and then exited the aircraft to inspect the damage. The left wingtip of our aircraft had a small scratch; but no other damage was visible. The tail of the Caravan has a sizable dent on the underside of the tail where it made contact with the wing. After talking to the ramp employee; he said that he attempted to give us a stop signal; but knew it was too late. He also said he attempted to stop the aircraft by grabbing it with his arm; resulting in a bruise on his left forearm. As for a more detailed step by step of the incident:After startup and the before taxi checklist; I flashed my taxi light to indicate we were ready to begin taxi. The single lineman was not directly in front of our aircraft; but standing just to the right; directly behind the tail of the Caravan. He didn't give the typical 'move forward' motion with his arms; just a thumbs up to indicate we were good to start moving. I released the brake and began moving forward a few feet; before turning to right towards the taxiway and the gap between the aircraft. The First Officer was focused on the right wing; announcing a 'clear right'. As my left wing approached the Caravan; the lineman gave thumbs up indicating we were clear of the other aircraft; so I announced 'clear left'. I looked forward and briefly looked to the right to assess the distance. As I looked back to the left; from my perspective it looked clear; but a little close; so I attempted to slow down and turn to the right. This is when I was given a stop signal; but as I began applying the brakes is when the wing made contact with tail of the Caravan. [I] suggest more wing walkers when taxiing out of the overflow area in ZZZ.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.