Grumman AA1 rolled out of base leg turn, and just requested by tower to extend base leg to the left parallel runway, when he observed a cessna below and ahead of him heading to the right parallel runway. No time for evasive action. However, the tower controller had already provided separation.

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Attributes
ACN	537159
Time
Date	200202
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : poc.airport
State Reference	CA
Altitude	agl single value : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : poc.tower
Operator	general aviation : personal
Make Model Name	Yankee
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : poc.tower
Operator	general aviation : personal
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 5 flight time total : 306 flight time type : 20
ASRS Report	537159
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : separated traffic
Miss Distance	horizontal : 250 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

I was flying right closed traffic for wy 26R at brackett airport. After several trips around the pattern, I was downwind nearing the approach end of the runway. At that time, I was cleared #1 for the option on runway 26R. A few seconds later, the tower called my base turn fairly close in. I made a fairly steep turn while starting an immediate descent. Just after completing the turn, the tower called for me to extend my base leg and land on runway 26L. I acknowledged, and started to reduce my descent rate. At that time, I saw the cessna on final for runway 26R pass just ahead of and below me. I don't believe that the cessna pilot ever saw me. We both made normal lndgs on our respective runways.

Original NASA ASRS Text

Title: GRUMMAN AA1 ROLLED OUT OF BASE LEG TURN, AND JUST REQUESTED BY TWR TO EXTEND BASE LEG TO THE L PARALLEL RWY, WHEN HE OBSERVED A CESSNA BELOW AND AHEAD OF HIM HEADING TO THE R PARALLEL RWY. NO TIME FOR EVASIVE ACTION. HOWEVER, THE TWR CTLR HAD ALREADY PROVIDED SEPARATION.

Narrative: I WAS FLYING R CLOSED TFC FOR WY 26R AT BRACKETT ARPT. AFTER SEVERAL TRIPS AROUND THE PATTERN, I WAS DOWNWIND NEARING THE APCH END OF THE RWY. AT THAT TIME, I WAS CLRED #1 FOR THE OPTION ON RWY 26R. A FEW SECONDS LATER, THE TWR CALLED MY BASE TURN FAIRLY CLOSE IN. I MADE A FAIRLY STEEP TURN WHILE STARTING AN IMMEDIATE DSCNT. JUST AFTER COMPLETING THE TURN, THE TWR CALLED FOR ME TO EXTEND MY BASE LEG AND LAND ON RWY 26L. I ACKNOWLEDGED, AND STARTED TO REDUCE MY DSCNT RATE. AT THAT TIME, I SAW THE CESSNA ON FINAL FOR RWY 26R PASS JUST AHEAD OF AND BELOW ME. I DON'T BELIEVE THAT THE CESSNA PLT EVER SAW ME. WE BOTH MADE NORMAL LNDGS ON OUR RESPECTIVE RWYS.

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.