C182 pilot had an near midair collision with a twin piper in sct class east airspace.

Attributes
ACN	607912
Time
Date	200402
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ajo.airport
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : vfr
Flight Plan	None
Aircraft 2
Make Model Name	Piper Twin Piston Undifferentiated or Other Model
Flight Phase	cruise : level
Route In Use	enroute airway : v8.airway
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 2.5 flight time total : 364.7 flight time type : 46.3
ASRS Report	607912
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 100 vertical : 10
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While flying in a C182 from french valley (F70) to fullerton (ful), descending through santa ana canyon on a heading of 270 degrees, altitude of 3000-3500 ft, airspeed 130 KTS, I adjusted the radio from 122.7 (monitor ajo) to ful ATIS. When I looked up, there was a piper twin (older aztec, I think) approximately 1500 ft away and moving slightly to the right, coming in the opposite direction. My reaction went from disbelief to banking left, and we missed by approximately 100 ft horizontal, with the piper about 10 ft above. No apparent change in altitude was made by the piper. It appears that the other aircraft may have been traveling along victor 8 toward fdz and that this happened about 1/2 way between points vplsa and vplpd on the los angeles terminal area chart.

Original NASA ASRS Text

Title: C182 PLT HAD AN NMAC WITH A TWIN PIPER IN SCT CLASS E AIRSPACE.

Narrative: WHILE FLYING IN A C182 FROM FRENCH VALLEY (F70) TO FULLERTON (FUL), DSNDING THROUGH SANTA ANA CANYON ON A HDG OF 270 DEGS, ALT OF 3000-3500 FT, AIRSPD 130 KTS, I ADJUSTED THE RADIO FROM 122.7 (MONITOR AJO) TO FUL ATIS. WHEN I LOOKED UP, THERE WAS A PIPER TWIN (OLDER AZTEC, I THINK) APPROX 1500 FT AWAY AND MOVING SLIGHTLY TO THE R, COMING IN THE OPPOSITE DIRECTION. MY REACTION WENT FROM DISBELIEF TO BANKING L, AND WE MISSED BY APPROX 100 FT HORIZ, WITH THE PIPER ABOUT 10 FT ABOVE. NO APPARENT CHANGE IN ALT WAS MADE BY THE PIPER. IT APPEARS THAT THE OTHER ACFT MAY HAVE BEEN TRAVELING ALONG VICTOR 8 TOWARD FDZ AND THAT THIS HAPPENED ABOUT 1/2 WAY BTWN POINTS VPLSA AND VPLPD ON THE LOS ANGELES TERMINAL AREA CHART.

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.