Near midair collision between air carrier-medium large transport and unk-light transport.

Attributes
ACN	91481
Time
Date	198807
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mad
State Reference	CT
Altitude	msl bound lower : 16500 msl bound upper : 16500
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute airway : zbw
Flight Plan	IFR
Aircraft 2
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 2000
ASRS Report	91481
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 225 flight time total : 8000 flight time type : 2600
ASRS Report	91485
Events
Anomaly	conflict : nmac inflight encounter : vfr in imc non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 300 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were on an IFR flight plan under ARTCC control. While descending through approximately 17000' for 11000, ARTCC called out traffic at 1 O'clock, 1 mi at 16500'. As ARTCC ended his transmission, the first officer and I saw a bright yellow aircraft at our 2 O'clock position, at our altitude, which was now about 16500', and at a range of about 300'. We believe this yellow aircraft was an light transport. The yellow aircraft was difficult to identify because: he was so close that we saw him for one second or less and he was in a hard left turn and we could only see the bottom of his aircraft. We had insufficient warning and insufficient time after sighting the other aircraft to take evasive action. Our course was 055 degrees and the yellow aircraft was heading approximately 330 degrees.

Original NASA ASRS Text

Title: NMAC BETWEEN ACR-MLG AND UNK-LTT.

Narrative: WE WERE ON AN IFR FLT PLAN UNDER ARTCC CTL. WHILE DSNDING THROUGH APPROX 17000' FOR 11000, ARTCC CALLED OUT TFC AT 1 O'CLOCK, 1 MI AT 16500'. AS ARTCC ENDED HIS XMISSION, THE F/O AND I SAW A BRIGHT YELLOW ACFT AT OUR 2 O'CLOCK POS, AT OUR ALT, WHICH WAS NOW ABOUT 16500', AND AT A RANGE OF ABOUT 300'. WE BELIEVE THIS YELLOW ACFT WAS AN LTT. THE YELLOW ACFT WAS DIFFICULT TO IDENTIFY BECAUSE: HE WAS SO CLOSE THAT WE SAW HIM FOR ONE SECOND OR LESS AND HE WAS IN A HARD LEFT TURN AND WE COULD ONLY SEE THE BOTTOM OF HIS ACFT. WE HAD INSUFFICIENT WARNING AND INSUFFICIENT TIME AFTER SIGHTING THE OTHER ACFT TO TAKE EVASIVE ACTION. OUR COURSE WAS 055 DEGS AND THE YELLOW ACFT WAS HDG APPROX 330 DEGS.

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.