Near midair collision between an medium large transport on the river visual approach to lga and a helicopter turning to the south of the final approach path. Flight crew received alerts from TCASII, ATC advisory and the first officer visual sighting of the helicopter.

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Attributes
ACN	382079
Time
Date	199710
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 1700 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Operating Under FAR Part	other : unknown
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 220 flight time total : 13000 flight time type : 2500
ASRS Report	382079
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 250 vertical : 250
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Cleared for river visual approach. Just leaving the river semi base and abeam to OM for lga, leaving 2000 ft, had to set 1700 ft (OM altitude) and started descent for final approach at lga. TCASII TA, then RA 'climb, climb, climb.' at 1750 ft started RA climb. Saw chopper VFR at 1500 ft ( 1 O'clock, low) turning away (more southerly toward downtown nyc). ATC lga approach pointed out traffic as we got TCASII RA. All ok. TCASII 'clear of traffic,' landing uneventful. Thank you all for the TCASII system. Works great! Thank you all at lga ATC -- also great job -- and my first officer spotted the VFR traffic at same time TCASII and ATC pointout. It works.

Original NASA ASRS Text

Title: NMAC BTWN AN MLG ON THE RIVER VISUAL APCH TO LGA AND A HELI TURNING TO THE S OF THE FINAL APCH PATH. FLC RECEIVED ALERTS FROM TCASII, ATC ADVISORY AND THE FO VISUAL SIGHTING OF THE HELI.

Narrative: CLRED FOR RIVER VISUAL APCH. JUST LEAVING THE RIVER SEMI BASE AND ABEAM TO OM FOR LGA, LEAVING 2000 FT, HAD TO SET 1700 FT (OM ALT) AND STARTED DSCNT FOR FINAL APCH AT LGA. TCASII TA, THEN RA 'CLB, CLB, CLB.' AT 1750 FT STARTED RA CLB. SAW CHOPPER VFR AT 1500 FT ( 1 O'CLOCK, LOW) TURNING AWAY (MORE SOUTHERLY TOWARD DOWNTOWN NYC). ATC LGA APCH POINTED OUT TFC AS WE GOT TCASII RA. ALL OK. TCASII 'CLR OF TFC,' LNDG UNEVENTFUL. THANK YOU ALL FOR THE TCASII SYS. WORKS GREAT! THANK YOU ALL AT LGA ATC -- ALSO GREAT JOB -- AND MY FO SPOTTED THE VFR TFC AT SAME TIME TCASII AND ATC POINTOUT. IT WORKS.

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.