Near midair collision.

Attributes
ACN	93384
Time
Date	198808
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : teb
State Reference	NJ
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	Marginal
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90 tower : ord
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 3000
ASRS Report	93384
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	other Other
Miss Distance	vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Located 18 DME west of teterboro VOR on 275 degree right at 7000' MSL, flight was cleared by north.Y. Approach to descend and maintain 3000'. Immediately prior to acknowledging descent clearance an aircraft with lights on passed below flight within 200'. Upon acknowledging the descent clearance to approach control, we added that we had experienced a near miss with an aircraft just seconds earlier. The controller responded by saying that I was the only aircraft on the scope in that sector, and on that frequency. His response also included the statement that is was probably an illegal aircraft in the TCA. Callback conversation with reporter revealed the following: captain states first officer confirmed near midair collision which happened so fast he wondered if it could have been some other phenomenon. Both pilots shocked as no traffic advisory given. Tried to determine if it could have been any ground lighting as they were at base of overcast. Both are sure it was an aircraft, and even thought they might take a wing hit, their best guess is that what they saw was the right wing landing light of an small aircraft. Even at 250 KTS below 10000', closure rate was rapid. Both very shocked.

Original NASA ASRS Text

Title: NMAC.

Narrative: LOCATED 18 DME W OF TETERBORO VOR ON 275 DEG R AT 7000' MSL, FLT WAS CLRED BY N.Y. APCH TO DSND AND MAINTAIN 3000'. IMMEDIATELY PRIOR TO ACKNOWLEDGING DSCNT CLRNC AN ACFT WITH LIGHTS ON PASSED BELOW FLT WITHIN 200'. UPON ACKNOWLEDGING THE DSCNT CLRNC TO APCH CTL, WE ADDED THAT WE HAD EXPERIENCED A NEAR MISS WITH AN ACFT JUST SECS EARLIER. THE CTLR RESPONDED BY SAYING THAT I WAS THE ONLY ACFT ON THE SCOPE IN THAT SECTOR, AND ON THAT FREQ. HIS RESPONSE ALSO INCLUDED THE STATEMENT THAT IS WAS PROBABLY AN ILLEGAL ACFT IN THE TCA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: CAPT STATES F/O CONFIRMED NMAC WHICH HAPPENED SO FAST HE WONDERED IF IT COULD HAVE BEEN SOME OTHER PHENOMENON. BOTH PLTS SHOCKED AS NO TFC ADVISORY GIVEN. TRIED TO DETERMINE IF IT COULD HAVE BEEN ANY GND LIGHTING AS THEY WERE AT BASE OF OVERCAST. BOTH ARE SURE IT WAS AN ACFT, AND EVEN THOUGHT THEY MIGHT TAKE A WING HIT, THEIR BEST GUESS IS THAT WHAT THEY SAW WAS THE RIGHT WING LNDG LIGHT OF AN SMA. EVEN AT 250 KTS BELOW 10000', CLOSURE RATE WAS RAPID. BOTH VERY SHOCKED.

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.