GA small aircraft landed on taxiway at isp.

Attributes
ACN	151836
Time
Date	199007
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : isp tower : las
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach landing other
Route In Use	approach : circling
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 1300 flight time type : 90
ASRS Report	151836
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I made a normal ILS 26 approach with instructions to circle to land runway 15R. Visibility was limited. As I was circling, tower informed me 'you appear to be lined up for runway 15L--cleared to land 15L.' what I was actually seeing was a non-adjacent taxiway. I landed on that taxiway. I noticed aircraft following me were all landing on 24. I think visibility was too poor for tower to be requesting circling approachs. (There was very little wind at the time.)

Original NASA ASRS Text

Title: GA SMA LANDED ON TXWY AT ISP.

Narrative: I MADE A NORMAL ILS 26 APCH WITH INSTRUCTIONS TO CIRCLE TO LAND RWY 15R. VISIBILITY WAS LIMITED. AS I WAS CIRCLING, TWR INFORMED ME 'YOU APPEAR TO BE LINED UP FOR RWY 15L--CLRED TO LAND 15L.' WHAT I WAS ACTUALLY SEEING WAS A NON-ADJACENT TXWY. I LANDED ON THAT TXWY. I NOTICED ACFT FOLLOWING ME WERE ALL LNDG ON 24. I THINK VISIBILITY WAS TOO POOR FOR TWR TO BE REQUESTING CIRCLING APCHS. (THERE WAS VERY LITTLE WIND AT THE TIME.)

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.