Flight crew of commuter air carrier mdt making approach at isp encountered an unknown small aircraft on short final and avoided him by underflying small aircraft by 100'.

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Attributes
ACN	143476
Time
Date	199004
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp
State Reference	NY
Altitude	msl bound lower : 800 msl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : isp tracon : bdl
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach other
Route In Use	approach : visual approach : straight in
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 1900
ASRS Report	143476
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 4200
ASRS Report	143179
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	unspecified : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

We (heavy turboprop) were cleared to land on 33L at islip, long island. We were short final when we noticed an small aircraft in front of us. A go around would not have been possible or practical due to closeness of aircraft and the small aircraft being at greater altitude. Supplemental information from acn 143179: cleared to land on runway 33L about 5 mi from the airport with no traffic reported to follow or in the area. At about 800' MSL noticed a small plane in front of us, at our altitude and speed (about 80 KTS faster than the small aircraft) we determined it would be better to maneuver under the small aircraft and land, which caused us to come within about 100' of the smaller plane.

Original NASA ASRS Text

Title: FLT CREW OF COMMUTER ACR MDT MAKING APCH AT ISP ENCOUNTERED AN UNKNOWN SMA ON SHORT FINAL AND AVOIDED HIM BY UNDERFLYING SMA BY 100'.

Narrative: WE (HVY TURBOPROP) WERE CLRED TO LAND ON 33L AT ISLIP, LONG ISLAND. WE WERE SHORT FINAL WHEN WE NOTICED AN SMA IN FRONT OF US. A GAR WOULD NOT HAVE BEEN POSSIBLE OR PRACTICAL DUE TO CLOSENESS OF ACFT AND THE SMA BEING AT GREATER ALT. SUPPLEMENTAL INFO FROM ACN 143179: CLRED TO LAND ON RWY 33L ABOUT 5 MI FROM THE ARPT WITH NO TFC RPTED TO FOLLOW OR IN THE AREA. AT ABOUT 800' MSL NOTICED A SMALL PLANE IN FRONT OF US, AT OUR ALT AND SPD (ABOUT 80 KTS FASTER THAN THE SMA) WE DETERMINED IT WOULD BE BETTER TO MANEUVER UNDER THE SMA AND LAND, WHICH CAUSED US TO COME WITHIN ABOUT 100' OF THE SMALLER PLANE.

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.