Near midair collision between air carrier large transport and commuter light transport near lga.

Attributes
ACN	151001
Time
Date	199007
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 7000 msl bound upper : 8000
Environment
Flight Conditions	Mixed
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	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 11000 flight time type : 6000
ASRS Report	151001
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 90 flight time total : 3100 flight time type : 550
ASRS Report	151117
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated faa : reviewed incident with flight crew
Miss Distance	horizontal : 200 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Approximately 5 mi north of lga VOR we were proceeding on a northwest vector and climbing from 6000' for 16000' when the controller said 'expedite climb through 8000'.' a few seconds later he commanded a left turn to 240 degrees. As I started the turn my engineer said, 'lookout!' and I immediately reversed the turn and pushed over to avoid a twin-propeller commuter Y which was also executing an avoidance maneuver. Time from initial sighting until aircraft passage was less then ten seconds. I estimate that the 2 aircraft passed within 200' of each other. I notified the controller that we had experienced a near near midair collision. I later talked to controller's supervisor (after landing) and he told me that both aircraft were adhering to their clrncs and that definitely there had been a case of controller error. Supplemental information from acn 151117. We heard the sound of the turboprops as he passed overhead. The turboprop was in an aggressive pull up and I feel if he had not taken evasive action we would have collided.

Original NASA ASRS Text

Title: NMAC BETWEEN ACR LGT AND COMMUTER LTT NEAR LGA.

Narrative: APPROX 5 MI N OF LGA VOR WE WERE PROCEEDING ON A NW VECTOR AND CLBING FROM 6000' FOR 16000' WHEN THE CTLR SAID 'EXPEDITE CLB THROUGH 8000'.' A FEW SECS LATER HE COMMANDED A L TURN TO 240 DEGS. AS I STARTED THE TURN MY ENGINEER SAID, 'LOOKOUT!' AND I IMMEDIATELY REVERSED THE TURN AND PUSHED OVER TO AVOID A TWIN-PROP COMMUTER Y WHICH WAS ALSO EXECUTING AN AVOIDANCE MANEUVER. TIME FROM INITIAL SIGHTING UNTIL ACFT PASSAGE WAS LESS THEN TEN SECS. I ESTIMATE THAT THE 2 ACFT PASSED WITHIN 200' OF EACH OTHER. I NOTIFIED THE CTLR THAT WE HAD EXPERIENCED A NEAR NMAC. I LATER TALKED TO CTLR'S SUPVR (AFTER LNDG) AND HE TOLD ME THAT BOTH ACFT WERE ADHERING TO THEIR CLRNCS AND THAT DEFINITELY THERE HAD BEEN A CASE OF CTLR ERROR. SUPPLEMENTAL INFO FROM ACN 151117. WE HEARD THE SOUND OF THE TURBOPROPS AS HE PASSED OVERHEAD. THE TURBOPROP WAS IN AN AGGRESSIVE PULL UP AND I FEEL IF HE HAD NOT TAKEN EVASIVE ACTION WE WOULD HAVE COLLIDED.

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.