Near midair collision between a piper cherokee turning short final to the wrong parallel runway and a beech B35 on final. Reporting pilot of the cherokee slowed to avoid the B35. The reporter did not hear the tower give him a runway change.

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Attributes
ACN	538911
Time
Date	200202
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pwa.airport
State Reference	OK
Altitude	msl single value : 2100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pwa.tower
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual approach : traffic pattern
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : pwa.tower
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual approach : traffic pattern
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 45 flight time total : 3820 flight time type : 3400
ASRS Report	538911
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	incursion : runway non adherence : clearance other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	horizontal : 200 vertical : 150
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was on downwind for runway 17L and was inside of another aircraft tower advised me, by wrong n-number, to enter right base for runway 17R. I had been previously cleared runway 17L and was following a bonanza going to runway 17R. I did not hear the change to runway 17R and thought the aircraft I was following was the one touching down. I turned an immediate base for short final to runway 17L and did not see the bonanza I was following in fact was on an extended final. Saw him at last min and did not have to take evasive other than slow approach speed. Aircraft behind him that I was then in front did have to do s-turns for spacing. I did not hear runway change another pilot following said the tower changed us both. Correction: be more aware of possible last min runway changes and more observant for other aircraft in class D airspace, even when tower requests change, ie, close in base, short final.

Original NASA ASRS Text

Title: NMAC BTWN A PIPER CHEROKEE TURNING SHORT FINAL TO THE WRONG PARALLEL RWY AND A BEECH B35 ON FINAL. RPTING PLT OF THE CHEROKEE SLOWED TO AVOID THE B35. THE RPTR DID NOT HEAR THE TWR GIVE HIM A RWY CHANGE.

Narrative: I WAS ON DOWNWIND FOR RWY 17L AND WAS INSIDE OF ANOTHER ACFT TWR ADVISED ME, BY WRONG N-NUMBER, TO ENTER R BASE FOR RWY 17R. I HAD BEEN PREVIOUSLY CLRED RWY 17L AND WAS FOLLOWING A BONANZA GOING TO RWY 17R. I DID NOT HEAR THE CHANGE TO RWY 17R AND THOUGHT THE ACFT I WAS FOLLOWING WAS THE ONE TOUCHING DOWN. I TURNED AN IMMEDIATE BASE FOR SHORT FINAL TO RWY 17L AND DID NOT SEE THE BONANZA I WAS FOLLOWING IN FACT WAS ON AN EXTENDED FINAL. SAW HIM AT LAST MIN AND DID NOT HAVE TO TAKE EVASIVE OTHER THAN SLOW APCH SPD. ACFT BEHIND HIM THAT I WAS THEN IN FRONT DID HAVE TO DO S-TURNS FOR SPACING. I DID NOT HEAR RWY CHANGE ANOTHER PLT FOLLOWING SAID THE TWR CHANGED US BOTH. CORRECTION: BE MORE AWARE OF POSSIBLE LAST MIN RWY CHANGES AND MORE OBSERVANT FOR OTHER ACFT IN CLASS D AIRSPACE, EVEN WHEN TWR REQUESTS CHANGE, IE, CLOSE IN BASE, SHORT FINAL.

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.