Aircraft unknown cargo type flew into class B airspace without an operating transponder. Reporter assumed that when receiving a reply light after pushing the identify button that the transponder worked. Before the next takeoff tower advised reporter that they weren't receiving his transponder.

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Attributes
ACN	347630
Time
Date	199609
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : tpa
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	ground other : taxi
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 100 flight time total : 4000 flight time type : 300
ASRS Report	347630
Events
Anomaly	aircraft equipment problem : less severe non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Flew into tpa class B at approximately XX40 transponder wasn't picked up. Landed at tpa. Pushed the identify button and received the reply light. After clearing customs, got clearance and taxied for takeoff. Tower advised that they didn't receive my transponder. However, gave me clearance for takeoff. I would not have taken off had I thought that my transponder was inoperative. As I said before, I thought the problem was rectified.

Original NASA ASRS Text

Title: ACFT UNKNOWN CARGO TYPE FLEW INTO CLASS B AIRSPACE WITHOUT AN OPERATING XPONDER. RPTR ASSUMED THAT WHEN RECEIVING A REPLY LIGHT AFTER PUSHING THE IDENT BUTTON THAT THE XPONDER WORKED. BEFORE THE NEXT TKOF TWR ADVISED RPTR THAT THEY WEREN'T RECEIVING HIS XPONDER.

Narrative: FLEW INTO TPA CLASS B AT APPROX XX40 XPONDER WASN'T PICKED UP. LANDED AT TPA. PUSHED THE IDENT BUTTON AND RECEIVED THE REPLY LIGHT. AFTER CLRING CUSTOMS, GOT CLRNC AND TAXIED FOR TKOF. TWR ADVISED THAT THEY DIDN'T RECEIVE MY XPONDER. HOWEVER, GAVE ME CLRNC FOR TKOF. I WOULD NOT HAVE TAKEN OFF HAD I THOUGHT THAT MY XPONDER WAS INOP. AS I SAID BEFORE, I THOUGHT THE PROB WAS RECTIFIED.

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.