C182 pilot reported an near midair collision in the pattern at an airport where skydiving operations...

Narrative:

I fly for a skydiving company at [my] airport. I was descending after I had released the jumpers. TRACON advised me that the airshow at [nearby] was routing their airshow traffic a few miles southeast of our airport. I was especially vigilant for traffic because of this. I even announced on our CTAF and their CTAF what was happening with the jumpers. I set up to enter a 45 degree entry for the downwind of runway 28. I leveled at pattern altitude about a half mile before I turned downwind. I announced my intentions and was talking to a helicopter from the airshow that was landing for fuel. I turned onto downwind and immediately saw a stearman biplane headed the opposite direction at the same altitude. He was headed west and I was headed east. I made a sharp banking turn to the left as he was already on my right. If I had not made an evasive maneuver; we probably would have passed within 100 feet of each other. He was not announcing his intentions on either frequency; yet flew through the downwind at pattern altitude. We have a NOTAM for parachute activity and some of our jumpers even jumped at the same airshow that morning; so he should have been aware of jumping activity and stayed well clear of [the airport]. Thankfully it was me in the plane and not a jumper with a much less maneuverable parachute.

Original NASA ASRS Text

Title: C182 pilot reported an NMAC in the pattern at an airport where skydiving operations were taking place.

Narrative: I fly for a skydiving company at [my] airport. I was descending after I had released the jumpers. TRACON advised me that the airshow at [nearby] was routing their airshow traffic a few miles southeast of our airport. I was especially vigilant for traffic because of this. I even announced on our CTAF and their CTAF what was happening with the jumpers. I set up to enter a 45 degree entry for the downwind of runway 28. I leveled at pattern altitude about a half mile before I turned downwind. I announced my intentions and was talking to a helicopter from the airshow that was landing for fuel. I turned onto downwind and immediately saw a Stearman biplane headed the opposite direction at the same altitude. He was headed west and I was headed east. I made a sharp banking turn to the left as he was already on my right. If I had not made an evasive maneuver; we probably would have passed within 100 feet of each other. He was not announcing his intentions on either frequency; yet flew through the downwind at pattern altitude. We have a NOTAM for parachute activity and some of our jumpers even jumped at the same airshow that morning; so he should have been aware of jumping activity and stayed well clear of [the airport]. Thankfully it was me in the plane and not a jumper with a much less maneuverable parachute.

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.

Attributes
ACN	1371032
Time
Date	201607
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	VFR
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 90 Flight Crew Total 400 Flight Crew Type 90
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 300 Vertical 0

C182 pilot reported an near midair collision in the pattern at an airport where skydiving operations were taking place.