Date: 201507
Local time of day: 0601-1200
Location: COS.Airport, CO
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Operator: FBO
Operating under: Part 91
Flight plan: None
Mission: Personal
Flight phase: Initial Climb; Climb
Airspace: Class C COS
ATC / advisory: Tower COS
Second aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Reporter organization: FBO
Reporter function: Single Pilot; Pilot Flying
Reporter qualification: Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Human factors: Situational Awareness; Communication Breakdown
Second reporter function: Instructor; Local
Anomaly: ATC Issue All Types; Conflict NMAC
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Took Evasive Action
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: After a normal engine start; taxi; and run up; I called Springs Tower that I was ready for departure on 17R. There was significant traffic at the airport and the Tower frequency was very busy. It was my impression that the controller was a trainee. After waiting approximately 15 minutes at the hold short line; I was cleared for takeoff on Runway 17R. After a normal takeoff; Springs Tower instructed me to turn right to a heading of 260. This is a normal procedure for westbound departures from this runway. I made turn and continued my climb out. There was significant radio traffic on the Tower frequency. I heard another aircraft report entering on a 45; making this transmission several times without an acknowledgement from ATC. During my scan; I then saw another aircraft at my 11:00 position above me heading toward me. I made an immediate right hand diving evasive turn. After the maneuver; Tower called me to report traffic at 11:00 less than one mile. I thought of responding to Tower that I just avoided that traffic; but elected not to make the transmission due to the channel congestion. I then proceeded with my climb out and was directed to contact Departure Control. The flight was completed without further incident. I believe the root cause of the problem was with the Local Controller at KCOS. Both the Tower frequency and the airspace around the airport was extremely busy. The controller appeared to be a trainee and was very busy; with takeoffs; landings; and pattern work occurring on 3 different runways (17L;R; 13). This is evidenced by the very long delay I encountered waiting for a VFR take off clearance and the delayed traffic call out of my near miss traffic. I didn't receive the traffic notification until after I had taken evasive action.


Second narrative: High-wing aircraft was departing runway 17R southwest bound climbing visual. Another high-wing inbound for right downwind 17R from the southwest. My trainee was giving the relief briefing as the first was departing. Towards the end of the brief my trainee turned the departing aircraft west bound with the inbound aircraft approaching the full downwind. The briefing was finished and the position was given to the relieving Air Traffic Control Specialist (CPC). I remained monitoring the position and told the CPC about the inbound aircraft. Traffic was exchanged and at least one aircraft got the other in sight.


Synopsis: An aircraft departing COS 17R was given a westbound turnout with another aircraft inbound on the 45; which resulted in the departing aircraft taking evasive action.