Narrative:

Initial climb IFR from ont direct pdz VOR as cleared and climbing to 6000 ft. No TA's received. At about 3400 ft in climb, noticed a beech 18T in the 1 O'clock position heading nnw at about 3450-3500 ft. Immediately brought power to flight idle and applied forward control pressure. Estimated that the beech crossed overhead by about 50 ft. I immediately notified ATC of the near miss and the beech 18 pilot recognized that he saw me as well. The closest call I have ever had and under IFR, too. Upon reaching pdz VOR, departure control advised to turn right to join V186 (which is a wbound airway). I advised that my flight plan and clearance was via direct pdz VOR and then direct to jli VOR (which is in the sebound course). I believe the controller had incorrect information as to my direction and course. This may have been a contributing factor. Other contributing factors may have been: 1) the sun's position in my windshield relative to my direction afforded poor visibility between the 11 O'clock and 1 O'clock position. 2) the B-18T pilot probably did not see my aircraft until the last second, because I was below him and most likely obscured by the long nose, which is part of the turbine conversion. 3) occurrence happened shortly after contact with departure control and I was not aware of the B-18's presence. 4) santa ana winds in local area may have caused some confusion for controller due to nonstandard departure and climb procedures.

Related reports:

Google
 

Original NASA ASRS Text

Title: C208B PLT HAS NMAC DURING INITIAL DEP CLB FROM KONT.

Narrative: INITIAL CLB IFR FROM ONT DIRECT PDZ VOR AS CLRED AND CLBING TO 6000 FT. NO TA'S RECEIVED. AT ABOUT 3400 FT IN CLB, NOTICED A BEECH 18T IN THE 1 O'CLOCK POS HDG NNW AT ABOUT 3450-3500 FT. IMMEDIATELY BROUGHT PWR TO FLT IDLE AND APPLIED FORWARD CTL PRESSURE. ESTIMATED THAT THE BEECH CROSSED OVERHEAD BY ABOUT 50 FT. I IMMEDIATELY NOTIFIED ATC OF THE NEAR MISS AND THE BEECH 18 PLT RECOGNIZED THAT HE SAW ME AS WELL. THE CLOSEST CALL I HAVE EVER HAD AND UNDER IFR, TOO. UPON REACHING PDZ VOR, DEP CTL ADVISED TO TURN R TO JOIN V186 (WHICH IS A WBOUND AIRWAY). I ADVISED THAT MY FLT PLAN AND CLRNC WAS VIA DIRECT PDZ VOR AND THEN DIRECT TO JLI VOR (WHICH IS IN THE SEBOUND COURSE). I BELIEVE THE CTLR HAD INCORRECT INFO AS TO MY DIRECTION AND COURSE. THIS MAY HAVE BEEN A CONTRIBUTING FACTOR. OTHER CONTRIBUTING FACTORS MAY HAVE BEEN: 1) THE SUN'S POS IN MY WINDSHIELD RELATIVE TO MY DIRECTION AFFORDED POOR VISIBILITY BTWN THE 11 O'CLOCK AND 1 O'CLOCK POS. 2) THE B-18T PLT PROBABLY DID NOT SEE MY ACFT UNTIL THE LAST SECOND, BECAUSE I WAS BELOW HIM AND MOST LIKELY OBSCURED BY THE LONG NOSE, WHICH IS PART OF THE TURBINE CONVERSION. 3) OCCURRENCE HAPPENED SHORTLY AFTER CONTACT WITH DEP CTL AND I WAS NOT AWARE OF THE B-18'S PRESENCE. 4) SANTA ANA WINDS IN LCL AREA MAY HAVE CAUSED SOME CONFUSION FOR CTLR DUE TO NONSTANDARD DEP AND CLB PROCS.

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.