Aircraft reported he had a near miss with a widebody transport.

Attributes
ACN	128501
Time
Date	198911
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : teb airport : ewk
State Reference	NJ
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 3500 flight time type : 800
ASRS Report	128501
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X widebody transport originated at lax and terminated at ewr. Upon reaching the ny terminal area, the controller had informed us of a widebody transport aircraft that reported moderate to severe turbulence and instructed us to maintain 4000', and moments later 3000'. At that time shortly prior to making the approach the pilot of a light twin claimed to have abruptly pulled up to prevent from colliding with our aircraft. At no time did we see this aircraft as we were in IMC conditions. Our crew followed ATC instructions as well as company airlines SOP. The only unusual circumstance surrounding this event was the low altimeter setting, in which all of our onboard equipment was set correctly and verified by each crew member. Callback conversation with reporter revealed the following: reporter states that he is not sure they were the other aircraft involved in the alleged near midair collision. He sent the report in just in case. They never saw another aircraft near them and were in IMC conditions for a considerable time. They were never asked to call ATC nor given any indication they might have been involved. Other aircraft that reported near midair collision was an small transport. Incident occurred about 10-20 mi west of teb.

Original NASA ASRS Text

Title: ACFT REPORTED HE HAD A NEAR MISS WITH A WDB.

Narrative: ACR X WDB ORIGINATED AT LAX AND TERMINATED AT EWR. UPON REACHING THE NY TERMINAL AREA, THE CTLR HAD INFORMED US OF A WDB ACFT THAT RPTED MODERATE TO SEVERE TURB AND INSTRUCTED US TO MAINTAIN 4000', AND MOMENTS LATER 3000'. AT THAT TIME SHORTLY PRIOR TO MAKING THE APCH THE PLT OF A LIGHT TWIN CLAIMED TO HAVE ABRUPTLY PULLED UP TO PREVENT FROM COLLIDING WITH OUR ACFT. AT NO TIME DID WE SEE THIS ACFT AS WE WERE IN IMC CONDITIONS. OUR CREW FOLLOWED ATC INSTRUCTIONS AS WELL AS COMPANY AIRLINES SOP. THE ONLY UNUSUAL CIRCUMSTANCE SURROUNDING THIS EVENT WAS THE LOW ALTIMETER SETTING, IN WHICH ALL OF OUR ONBOARD EQUIP WAS SET CORRECTLY AND VERIFIED BY EACH CREW MEMBER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATES THAT HE IS NOT SURE THEY WERE THE OTHER ACFT INVOLVED IN THE ALLEGED NMAC. HE SENT THE RPT IN JUST IN CASE. THEY NEVER SAW ANOTHER ACFT NEAR THEM AND WERE IN IMC CONDITIONS FOR A CONSIDERABLE TIME. THEY WERE NEVER ASKED TO CALL ATC NOR GIVEN ANY INDICATION THEY MIGHT HAVE BEEN INVOLVED. OTHER ACFT THAT RPTED NMAC WAS AN SMT. INCIDENT OCCURRED ABOUT 10-20 MI W OF TEB.

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.