An air carrier mdt jet on the minks 1 arrival received a TCASII RA and descended out of his assigned altitude over somto intersection and saw a cpr falcon jet pass overhead in close proximity. Falcon jet was also in a descent. No traffic information given by approach controller.

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Attributes
ACN	355378
Time
Date	199612
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ard
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 11000
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
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute airway : v214
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Falcon 10C
Operating Under FAR Part	Part 91
Flight Phase	descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 3500 flight time type : 20
ASRS Report	355378
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 450
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Just checked in with lga approach. TCASII issued an advisory and immediately issued an RA to descend. The captain disconnected the autoplt and established a 3000 FPM descent (negative G approximately half). I pulled up the traffic page on my multi-function display and noticed that the intruder aircraft had also initiated a descent. I advised the captain and he increased the descent rate. I continued looking for the aircraft visually and spotted it for approximately 2 seconds as it flew overhead very close. It ws a falcon bizjet. ATC never advised us of the traffic. After letting the controller know about our 1000 ft deviation from his clearance, he told us to remain at 10000 ft. I believe the TCASII was extremely valuable in this situation and the outcome would have been questionable without it. This is because the aircraft could not be seen until the last min. When the intruder aircraft was seen there was no time to react.

Original NASA ASRS Text

Title: AN ACR MDT JET ON THE MINKS 1 ARR RECEIVED A TCASII RA AND DSNDED OUT OF HIS ASSIGNED ALT OVER SOMTO INTXN AND SAW A CPR FALCON JET PASS OVERHEAD IN CLOSE PROX. FALCON JET WAS ALSO IN A DSCNT. NO TFC INFO GIVEN BY APCH CTLR.

Narrative: JUST CHKED IN WITH LGA APCH. TCASII ISSUED AN ADVISORY AND IMMEDIATELY ISSUED AN RA TO DSND. THE CAPT DISCONNECTED THE AUTOPLT AND ESTABLISHED A 3000 FPM DSCNT (NEGATIVE G APPROX HALF). I PULLED UP THE TFC PAGE ON MY MULTI-FUNCTION DISPLAY AND NOTICED THAT THE INTRUDER ACFT HAD ALSO INITIATED A DSCNT. I ADVISED THE CAPT AND HE INCREASED THE DSCNT RATE. I CONTINUED LOOKING FOR THE ACFT VISUALLY AND SPOTTED IT FOR APPROX 2 SECONDS AS IT FLEW OVERHEAD VERY CLOSE. IT WS A FALCON BIZJET. ATC NEVER ADVISED US OF THE TFC. AFTER LETTING THE CTLR KNOW ABOUT OUR 1000 FT DEV FROM HIS CLRNC, HE TOLD US TO REMAIN AT 10000 FT. I BELIEVE THE TCASII WAS EXTREMELY VALUABLE IN THIS SIT AND THE OUTCOME WOULD HAVE BEEN QUESTIONABLE WITHOUT IT. THIS IS BECAUSE THE ACFT COULD NOT BE SEEN UNTIL THE LAST MIN. WHEN THE INTRUDER ACFT WAS SEEN THERE WAS NO TIME TO REACT.

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.