Turboprop small transport is purported to have had an near midair collision with an small aircraft.

Attributes
ACN	185224
Time
Date	199107
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : udd
State Reference	CA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Small Transport
Flight Phase	descent : approach
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 3450 flight time type : 200
ASRS Report	185224
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 100 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

After landing at udd pilot of small aircraft approached me and stated that I had passed within 100 ft of him. I never saw the traffic despite trying my best to scan for traffic. Difference in aircraft speed might have played a role in this incident. I estimate a 150 KT difference between our 2 aircraft. I'll be even more alert, especially around uncontrolled fields.

Original NASA ASRS Text

Title: TURBOPROP SMT IS PURPORTED TO HAVE HAD AN NMAC WITH AN SMA.

Narrative: AFTER LNDG AT UDD PLT OF SMA APCHED ME AND STATED THAT I HAD PASSED WITHIN 100 FT OF HIM. I NEVER SAW THE TFC DESPITE TRYING MY BEST TO SCAN FOR TFC. DIFFERENCE IN ACFT SPD MIGHT HAVE PLAYED A ROLE IN THIS INCIDENT. I ESTIMATE A 150 KT DIFFERENCE BTWN OUR 2 ACFT. I'LL BE EVEN MORE ALERT, ESPECIALLY AROUND UNCONTROLLED FIELDS.

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.