Close proximity air carrier-large transport GA-small aircraft at N90 TCA sector boundary.

Attributes
ACN	122609
Time
Date	198909
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 2000 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 40 flight time total : 2500
ASRS Report	122609
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 19000 flight time type : 15000
ASRS Report	122437
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Approaching lga on vectors to runway 31, an small aircraft was noted to pass 300-400' below, right to left, on a vector away from lga. We were assigned tower frequency and were in the process of switching, when the F/east and I noticed the small aircraft. The F/east was instructed by the captain to return to approach frequency and advise them as to the position of the small aircraft. Approach was still unaware of the aircraft.

Original NASA ASRS Text

Title: CLOSE PROX ACR-LGT GA-SMA AT N90 TCA SECTOR BOUNDARY.

Narrative: APCHING LGA ON VECTORS TO RWY 31, AN SMA WAS NOTED TO PASS 300-400' BELOW, RIGHT TO LEFT, ON A VECTOR AWAY FROM LGA. WE WERE ASSIGNED TWR FREQ AND WERE IN THE PROCESS OF SWITCHING, WHEN THE F/E AND I NOTICED THE SMA. THE F/E WAS INSTRUCTED BY THE CAPT TO RETURN TO APCH FREQ AND ADVISE THEM AS TO THE POS OF THE SMA. APCH WAS STILL UNAWARE OF THE ACFT.

Data retrieved from NASA's ASRS site as of August 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.