Close proximity air carrier-medium large transport GA-small aircraft above lga.

Attributes
ACN	94358
Time
Date	198809
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 8400 msl bound upper : 8600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 artcc : zlc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 5500
ASRS Report	94358
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 : 13500
ASRS Report	94359
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 400 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Departed lga en route to cle on a heading of 310 degrees assigned on a clearance to climb to 9000'. We were being radar vectored to eventually intercept the sparta 252 degree right on a 310 degree heading climbing through 8400' I spotted an aircraft off the right front of our aircraft. It was slightly higher and transversing from the right and getting closer. When I initially spotted the aircraft I started a descent. At that time we were at 8400' when I pushed the nose of the aircraft down simultaneously pulling back on the throttles. During the pushover our aircraft reached an altitude of around 8500' and descended back down to 8400'. At that time the other aircraft had passed off the left and was out of sight. We informed ATC immediately and they said they had no traffic, but said they had one intermittent echo that had disappeared just as we made our initial call on the near miss. We idented the aircraft as an small aircraft, color was tan and was heading sse. It looked to be a fabric aircraft. I believe that because the aircraft was a fabric aircraft that ATC did not see him. Transponders with mode C should be mandatory.

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG GA-SMA ABOVE LGA.

Narrative: DEPARTED LGA ENRTE TO CLE ON A HDG OF 310 DEGS ASSIGNED ON A CLRNC TO CLB TO 9000'. WE WERE BEING RADAR VECTORED TO EVENTUALLY INTERCEPT THE SPARTA 252 DEG R ON A 310 DEG HDG CLBING THROUGH 8400' I SPOTTED AN ACFT OFF THE RIGHT FRONT OF OUR ACFT. IT WAS SLIGHTLY HIGHER AND TRANSVERSING FROM THE RIGHT AND GETTING CLOSER. WHEN I INITIALLY SPOTTED THE ACFT I STARTED A DSCNT. AT THAT TIME WE WERE AT 8400' WHEN I PUSHED THE NOSE OF THE ACFT DOWN SIMULTANEOUSLY PULLING BACK ON THE THROTTLES. DURING THE PUSHOVER OUR ACFT REACHED AN ALT OF AROUND 8500' AND DSNDED BACK DOWN TO 8400'. AT THAT TIME THE OTHER ACFT HAD PASSED OFF THE LEFT AND WAS OUT OF SIGHT. WE INFORMED ATC IMMEDIATELY AND THEY SAID THEY HAD NO TFC, BUT SAID THEY HAD ONE INTERMITTENT ECHO THAT HAD DISAPPEARED JUST AS WE MADE OUR INITIAL CALL ON THE NEAR MISS. WE IDENTED THE ACFT AS AN SMA, COLOR WAS TAN AND WAS HDG SSE. IT LOOKED TO BE A FABRIC ACFT. I BELIEVE THAT BECAUSE THE ACFT WAS A FABRIC ACFT THAT ATC DID NOT SEE HIM. TRANSPONDERS WITH MODE C SHOULD BE MANDATORY.

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.