A cessna 414 pilot had an airliner pass 500 ft below his aircraft near srq.

Attributes
ACN	454670
Time
Date	199911
Day	Mon
Local Time Of Day	1201 To 1800
Place
State Reference	FL
Altitude	msl single value : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Chancellor 414A & C414
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tracon : tpa.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 185 flight time total : 6250 flight time type : 3600
ASRS Report	454670
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Miss Distance	horizontal : 2000 vertical : 500
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

En route from awg to srq at 17500 ft, attempted to call tpa approach when at 10500 ft class B approval. No contacts until near srq. Saw large jet descending at 11 O'clock position and 500 ft lower. Finally contacted srq tower, who in turn had me contact tpa approach, then vectored for descent for landing.

Original NASA ASRS Text

Title: A CESSNA 414 PLT HAD AN AIRLINER PASS 500 FT BELOW HIS ACFT NEAR SRQ.

Narrative: ENRTE FROM AWG TO SRQ AT 17500 FT, ATTEMPTED TO CALL TPA APCH WHEN AT 10500 FT CLASS B APPROVAL. NO CONTACTS UNTIL NEAR SRQ. SAW LARGE JET DSNDING AT 11 O'CLOCK POS AND 500 FT LOWER. FINALLY CONTACTED SRQ TWR, WHO IN TURN HAD ME CONTACT TPA APCH, THEN VECTORED FOR DSCNT FOR LNDG.

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.