PA30 and cessna had near midair collision in O90 class C airspace.

Attributes
ACN	499232
Time
Date	200101
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : oak.vor
State Reference	CA
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : o90.tracon tower : dtw.tower
Operator	general aviation : personal
Make Model Name	PA-30 Twin Comanche
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	cruise : level descent : vacating altitude
Flight Plan	None
Aircraft 2
Controlling Facilities	tracon : o90.tracon
Operator	general aviation : personal
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 9 flight time total : 680 flight time type : 350
ASRS Report	499233
Person 2
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 300 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I was approaching mormon temple from bay bridge toll plaza on approach to oakland. As I was beginning descent from 3000 ft, a cessna aircraft appeared to rise up in front of me, on same course, about 100 yards ahead. I took evasive action by turning to my right.

Original NASA ASRS Text

Title: PA30 AND CESSNA HAD NMAC IN O90 CLASS C AIRSPACE.

Narrative: I WAS APCHING MORMON TEMPLE FROM BAY BRIDGE TOLL PLAZA ON APCH TO OAKLAND. AS I WAS BEGINNING DSCNT FROM 3000 FT, A CESSNA ACFT APPEARED TO RISE UP IN FRONT OF ME, ON SAME COURSE, ABOUT 100 YARDS AHEAD. I TOOK EVASIVE ACTION BY TURNING TO MY R.

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.