Near midair collision between air carrier mdt and GA small aircraft.

Attributes
ACN	84821
Time
Date	198804
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bdr
State Reference	CT
Altitude	msl bound lower : 3600 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Medium Transport
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2780 flight time type : 370
ASRS Report	84821
Person 2
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Over bridgeport we were notified of traffic 12 O'clock, 3 miles swbound altitude reads 3600' not verified'. We looked but nothing to be seen. Next call was traffic alert with heading. Turning immediately to the left, bank angle approximately 45 degree, I spotted the traffic, an small aircraft 100' below us. Horizontal distance less than 50'. Had we not climbed and turned, a collision would have been certain. The pilot in the small aircraft never saw us. He was in a VFR climb to 4000! The same aircraft called in 4 min later, verifying his altitude. Why he was not violated, I don't know. Maybe he has one coming. ATC did a great job. One way of preventing VFR traffic from flying at the wrong altitudes would be to decrease the time between biannuals and ensuring that the FARS are still in the back of ones mind before they fly.

Original NASA ASRS Text

Title: NMAC BETWEEN ACR MDT AND GA SMA.

Narrative: OVER BRIDGEPORT WE WERE NOTIFIED OF TFC 12 O'CLOCK, 3 MILES SWBOUND ALT READS 3600' NOT VERIFIED'. WE LOOKED BUT NOTHING TO BE SEEN. NEXT CALL WAS TFC ALERT WITH HEADING. TURNING IMMEDIATELY TO THE LEFT, BANK ANGLE APPROX 45 DEG, I SPOTTED THE TFC, AN SMA 100' BELOW US. HORIZONTAL DISTANCE LESS THAN 50'. HAD WE NOT CLIMBED AND TURNED, A COLLISION WOULD HAVE BEEN CERTAIN. THE PLT IN THE SMA NEVER SAW US. HE WAS IN A VFR CLIMB TO 4000! THE SAME ACFT CALLED IN 4 MIN LATER, VERIFYING HIS ALT. WHY HE WAS NOT VIOLATED, I DON'T KNOW. MAYBE HE HAS ONE COMING. ATC DID A GREAT JOB. ONE WAY OF PREVENTING VFR TFC FROM FLYING AT THE WRONG ALTS WOULD BE TO DECREASE THE TIME BETWEEN BIANNUALS AND ENSURING THAT THE FARS ARE STILL IN THE BACK OF ONES MIND BEFORE THEY FLY.

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.