2 smas had an near midair collision in the traffic pattern under tower control.

Attributes
ACN	217924
Time
Date	199208
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cnw
State Reference	TX
Altitude	msl bound lower : 1100 msl bound upper : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cnw
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach landing other
Route In Use	arrival other
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 25 flight time total : 144 flight time type : 14
ASRS Report	217924
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac incursion : runway non adherence : clearance
Miss Distance	horizontal : 500 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

I was on a visual approach (NDB 35R) under VFR conditions into cnw. After reporting over robinson beacon inbound, no more instructions were made to me. I was 1/2 mi from the threshold of 35R and was visually looking for traffic. Cnw tower cleared an small aircraft for takeoff on parallel runway 17R. The tower warned the small aircraft of my whereabouts. As I descended down to 980 ft MSL (MDA), I was about to execute missed approach and follow me circle-to-land procedure, which is circle to the east for a landing on 17L. Then the small aircraft requested left turn departure and was cleared for this left turn by tower. The small aircraft was at approximately 1000 ft MSL and started his turn right over the top of my aircraft. I lost visual sight and therefore realized a potential mid-air collision. I looked for incoming traffic on 17L and saw none. My only recourse was to land and get off runway as soon as possible, landing with a 10 KT tailwind. The entire phase of the flight is on tape from start to finish. On the tape: it showed that after my report over rob NDB beacon, tower gave instructions to report circle-to-land to the east. I did not hear these instructions and tower did not confirm that I had. When I first saw the small aircraft starting his turn he was so close I could see the pilots faces. I called the tower immediately after the flight by phone and he claimed we had adequate separation from his point of view. As PIC I determined we did not have adequate separation, therefore meeting the extent of the emergency, chose to do as I have stated. A report was filed by the controller. He stated that, after reviewing the tape, the pilot was given instructions to circle to the east and land 17L and ignored these instructions. An aircraft should not have been cleared into the exact area and at the same altitude that I was supposed to go. When I asked the tower about his instructions that he gave to me, I asked if I complied and read back instructions. His reply was, 'well most the pilots out here never do.'

Original NASA ASRS Text

Title: 2 SMAS HAD AN NMAC IN THE TFC PATTERN UNDER TWR CTL.

Narrative: I WAS ON A VISUAL APCH (NDB 35R) UNDER VFR CONDITIONS INTO CNW. AFTER RPTING OVER ROBINSON BEACON INBOUND, NO MORE INSTRUCTIONS WERE MADE TO ME. I WAS 1/2 MI FROM THE THRESHOLD OF 35R AND WAS VISUALLY LOOKING FOR TFC. CNW TWR CLRED AN SMA FOR TKOF ON PARALLEL RWY 17R. THE TWR WARNED THE SMA OF MY WHEREABOUTS. AS I DSNDED DOWN TO 980 FT MSL (MDA), I WAS ABOUT TO EXECUTE MISSED APCH AND FOLLOW ME CIRCLE-TO-LAND PROC, WHICH IS CIRCLE TO THE E FOR A LNDG ON 17L. THEN THE SMA REQUESTED L TURN DEP AND WAS CLRED FOR THIS L TURN BY TWR. THE SMA WAS AT APPROX 1000 FT MSL AND STARTED HIS TURN RIGHT OVER THE TOP OF MY ACFT. I LOST VISUAL SIGHT AND THEREFORE REALIZED A POTENTIAL MID-AIR COLLISION. I LOOKED FOR INCOMING TFC ON 17L AND SAW NONE. MY ONLY RECOURSE WAS TO LAND AND GET OFF RWY AS SOON AS POSSIBLE, LNDG WITH A 10 KT TAILWIND. THE ENTIRE PHASE OF THE FLT IS ON TAPE FROM START TO FINISH. ON THE TAPE: IT SHOWED THAT AFTER MY RPT OVER ROB NDB BEACON, TWR GAVE INSTRUCTIONS TO RPT CIRCLE-TO-LAND TO THE E. I DID NOT HEAR THESE INSTRUCTIONS AND TWR DID NOT CONFIRM THAT I HAD. WHEN I FIRST SAW THE SMA STARTING HIS TURN HE WAS SO CLOSE I COULD SEE THE PLTS FACES. I CALLED THE TWR IMMEDIATELY AFTER THE FLT BY PHONE AND HE CLAIMED WE HAD ADEQUATE SEPARATION FROM HIS POINT OF VIEW. AS PIC I DETERMINED WE DID NOT HAVE ADEQUATE SEPARATION, THEREFORE MEETING THE EXTENT OF THE EMER, CHOSE TO DO AS I HAVE STATED. A RPT WAS FILED BY THE CTLR. HE STATED THAT, AFTER REVIEWING THE TAPE, THE PLT WAS GIVEN INSTRUCTIONS TO CIRCLE TO THE E AND LAND 17L AND IGNORED THESE INSTRUCTIONS. AN ACFT SHOULD NOT HAVE BEEN CLRED INTO THE EXACT AREA AND AT THE SAME ALT THAT I WAS SUPPOSED TO GO. WHEN I ASKED THE TWR ABOUT HIS INSTRUCTIONS THAT HE GAVE TO ME, I ASKED IF I COMPLIED AND READ BACK INSTRUCTIONS. HIS REPLY WAS, 'WELL MOST THE PLTS OUT HERE NEVER DO.'

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.