Near midair collision between an arriving C210 on a high right downwind leg and a piper PA31 on climb out crossing through the flight path of the C210. The C210 pilot rapidly descended to avoid colliding with the PA31 which passed 100 ft above the C210.

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Attributes
ACN	485299
Time
Date	200008
Day	Sat
Local Time Of Day	1201 To 1800
Place
State Reference	NM
Altitude	agl single value : 1650
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : saf.tower
Operator	general aviation : personal
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C, 210D
Operating Under FAR Part	Part 91
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : saf.tower
Operator	general aviation : corporate
Make Model Name	Piper Twin Turboprop Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Route In Use	departure : vfr
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 34 flight time total : 545 flight time type : 300
Person 2
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	altitude deviation : undershoot non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Cheyenne cleared for takeoff runway 20 VFR to pick up IFR in air. C210 cleared to enter right downwind runway 20. Tower cleared cheyenne to change frequencys after takeoff. As C210 was nearing downwind position abeam approximately end of runway 20, cheyenne appeared at nearly 80 degree right side angle to the C210 at nearly the same altitude, perhaps 1 mi distant. I promptly closed the throttle and pushed the C210's nose into a dive to avoid a collision. Cheyenne overflew C210 by 100 ft or less. Lack of situational awareness by both pilots caused the problem. I believe contributing factors were that neither pilot called to know the intended heading of the other, and tower controller did not advise either pilot of the same information, though he clearly knew the intended heading of both aircraft and traffic was light. Lack of radar at saf also was a contributing factor, depriving controller of conflict information.

Original NASA ASRS Text

Title: NMAC BTWN AN ARRIVING C210 ON A HIGH R DOWNWIND LEG AND A PIPER PA31 ON CLBOUT XING THROUGH THE FLT PATH OF THE C210. THE C210 PLT RAPIDLY DSNDED TO AVOID COLLIDING WITH THE PA31 WHICH PASSED 100 FT ABOVE THE C210.

Narrative: CHEYENNE CLRED FOR TKOF RWY 20 VFR TO PICK UP IFR IN AIR. C210 CLRED TO ENTER R DOWNWIND RWY 20. TWR CLRED CHEYENNE TO CHANGE FREQS AFTER TKOF. AS C210 WAS NEARING DOWNWIND POS ABEAM APPROX END OF RWY 20, CHEYENNE APPEARED AT NEARLY 80 DEG R SIDE ANGLE TO THE C210 AT NEARLY THE SAME ALT, PERHAPS 1 MI DISTANT. I PROMPTLY CLOSED THE THROTTLE AND PUSHED THE C210'S NOSE INTO A DIVE TO AVOID A COLLISION. CHEYENNE OVERFLEW C210 BY 100 FT OR LESS. LACK OF SITUATIONAL AWARENESS BY BOTH PLTS CAUSED THE PROB. I BELIEVE CONTRIBUTING FACTORS WERE THAT NEITHER PLT CALLED TO KNOW THE INTENDED HDG OF THE OTHER, AND TWR CTLR DID NOT ADVISE EITHER PLT OF THE SAME INFO, THOUGH HE CLRLY KNEW THE INTENDED HDG OF BOTH ACFT AND TFC WAS LIGHT. LACK OF RADAR AT SAF ALSO WAS A CONTRIBUTING FACTOR, DEPRIVING CTLR OF CONFLICT INFO.

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.