C172 experienced near miss in isp traffic pattern.

Attributes
ACN	579889
Time
Date	200304
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : isp.airport
State Reference	NY
Altitude	agl single value : 900
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : isp.tower tower : bwi.tower
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : isp.tower
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Flight Phase	descent : approach
Route In Use	approach : visual
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : cfi
Experience	flight time last 90 days : 20 flight time total : 2200 flight time type : 1000
ASRS Report	579889
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	conflict : airborne critical non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 500
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Doing touch-and-goes with student pilot. Advised we were #2 for airport -- saw traffic on short final, thought that was our traffic. Saw other aircraft after we turned base. We turned out to let other aircraft ahead. We were making left traffic, other aircraft was on right traffic -- tower should have advised us when to turn base.

Original NASA ASRS Text

Title: C172 EXPERIENCED NEAR MISS IN ISP TFC PATTERN.

Narrative: DOING TOUCH-AND-GOES WITH STUDENT PLT. ADVISED WE WERE #2 FOR ARPT -- SAW TFC ON SHORT FINAL, THOUGHT THAT WAS OUR TFC. SAW OTHER ACFT AFTER WE TURNED BASE. WE TURNED OUT TO LET OTHER ACFT AHEAD. WE WERE MAKING L TFC, OTHER ACFT WAS ON R TFC -- TWR SHOULD HAVE ADVISED US WHEN TO TURN BASE.

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.