Near midair collision between a C182 turning base to final for the right parallel, but extended to over the left runway, and a C152 turning base to final for the left runway.

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Attributes
ACN	377584
Time
Date	199708
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sna
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 35 flight time total : 1800 flight time type : 1500
ASRS Report	377584
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : clearance
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 300 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On a VFR flight from ful to sna I was given instructions by the tower to enter a right base and expect runway 19R. While still on right base the tower told me to turn right 20 degrees for traffic spacing and also (separately) to watch for a departing aircraft on right downwind for runway 19R. This 20 degree vector put me on course for mid-field and by the time I idented the departing downwind traffic, I was very close to the airport. I then requested to overfly the airport and enter a left downwind for runway 19L. The controller denied this request and instructed me to turn for a right downwind to right. I was cleared to land and in turning base to final for the right (because by then I was in too close in on my downwind) I overlapped the approach to runway 19L and came much too close to an aircraft on left base to runway 19L. Tower instructed me to realign to the right and I landed without further incident. The problem here was I allowed myself to become distracted looking for my traffic and did not keep in the proper traffic pattern for the right downwind.

Original NASA ASRS Text

Title: NMAC BTWN A C182 TURNING BASE TO FINAL FOR THE R PARALLEL, BUT EXTENDED TO OVER THE L RWY, AND A C152 TURNING BASE TO FINAL FOR THE L RWY.

Narrative: ON A VFR FLT FROM FUL TO SNA I WAS GIVEN INSTRUCTIONS BY THE TWR TO ENTER A R BASE AND EXPECT RWY 19R. WHILE STILL ON R BASE THE TWR TOLD ME TO TURN R 20 DEGS FOR TFC SPACING AND ALSO (SEPARATELY) TO WATCH FOR A DEPARTING ACFT ON R DOWNWIND FOR RWY 19R. THIS 20 DEG VECTOR PUT ME ON COURSE FOR MID-FIELD AND BY THE TIME I IDENTED THE DEPARTING DOWNWIND TFC, I WAS VERY CLOSE TO THE ARPT. I THEN REQUESTED TO OVERFLY THE ARPT AND ENTER A L DOWNWIND FOR RWY 19L. THE CTLR DENIED THIS REQUEST AND INSTRUCTED ME TO TURN FOR A R DOWNWIND TO R. I WAS CLRED TO LAND AND IN TURNING BASE TO FINAL FOR THE R (BECAUSE BY THEN I WAS IN TOO CLOSE IN ON MY DOWNWIND) I OVERLAPPED THE APCH TO RWY 19L AND CAME MUCH TOO CLOSE TO AN ACFT ON L BASE TO RWY 19L. TWR INSTRUCTED ME TO REALIGN TO THE R AND I LANDED WITHOUT FURTHER INCIDENT. THE PROB HERE WAS I ALLOWED MYSELF TO BECOME DISTRACTED LOOKING FOR MY TFC AND DID NOT KEEP IN THE PROPER TFC PATTERN FOR THE R DOWNWIND.

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.