2 small aircraft aircraft have near midair collision north of cos.

Attributes
ACN	232874
Time
Date	199302
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cos airport : pub
State Reference	CO
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cos tower : mdw
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : student
Experience	flight time last 90 days : 16 flight time total : 32 flight time type : 19
ASRS Report	232874
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was flying sbound on a predetermined bearing of 156 degrees. I contacted cos approach on the 118.5 frequency. At this time I was directly off of the 330 degree radial of cos VORTAC. Upon contacting cos approach there was a break in the ATC transmission. I called back to reconfirm transponder code after telling him of the break. At this point, I was climbing to 9500 ft to transition the cos arsa and saw what appeared to be a single engine high wing aircraft. The position of his aircraft was at 9 O'clock from my own and diving. He was traveling wnw. After making visual contact, I immediately increased my rate of climb. After this incident cos approach verified radar contact and confirmed climb to 9500 ft. No mention was made by ATC. I continued along bearing 156 degrees to publication and after a short stop continued back to apa. This incident arose due to the nature of VFR which is sight and avoidance. It was discovered by myself and the other pilot making visual contact. There were no contributing factors. The corrective actions taken were myself continuing in a climb and turning right, other pilot diving.

Original NASA ASRS Text

Title: 2 SMA ACFT HAVE NMAC N OF COS.

Narrative: I WAS FLYING SBOUND ON A PREDETERMINED BEARING OF 156 DEGS. I CONTACTED COS APCH ON THE 118.5 FREQ. AT THIS TIME I WAS DIRECTLY OFF OF THE 330 DEG RADIAL OF COS VORTAC. UPON CONTACTING COS APCH THERE WAS A BREAK IN THE ATC XMISSION. I CALLED BACK TO RECONFIRM XPONDER CODE AFTER TELLING HIM OF THE BREAK. AT THIS POINT, I WAS CLBING TO 9500 FT TO TRANSITION THE COS ARSA AND SAW WHAT APPEARED TO BE A SINGLE ENG HIGH WING ACFT. THE POS OF HIS ACFT WAS AT 9 O'CLOCK FROM MY OWN AND DIVING. HE WAS TRAVELING WNW. AFTER MAKING VISUAL CONTACT, I IMMEDIATELY INCREASED MY RATE OF CLB. AFTER THIS INCIDENT COS APCH VERIFIED RADAR CONTACT AND CONFIRMED CLB TO 9500 FT. NO MENTION WAS MADE BY ATC. I CONTINUED ALONG BEARING 156 DEGS TO PUB AND AFTER A SHORT STOP CONTINUED BACK TO APA. THIS INCIDENT AROSE DUE TO THE NATURE OF VFR WHICH IS SIGHT AND AVOIDANCE. IT WAS DISCOVERED BY MYSELF AND THE OTHER PLT MAKING VISUAL CONTACT. THERE WERE NO CONTRIBUTING FACTORS. THE CORRECTIVE ACTIONS TAKEN WERE MYSELF CONTINUING IN A CLB AND TURNING R, OTHER PLT DIVING.

Data retrieved from NASA's ASRS site as of July 2007 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.