While cruising at 10000' reporter aircraft had a near midair collision with a small twin engine jet ...

Attributes
ACN	106429
Time
Date	198903
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : abb airport : sdf
State Reference	IN
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : sdf
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 10000
ASRS Report	106429
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : exited adverse environment none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Ambiguous

Narrative:

We were cruising at 10000' over abb VORTAC when sdf approach control (I think frequency 120.5) called VFR traffic, 1-2 O'clock at 10000'. I told the crew 'that is our altitude,' and we all looked for him. The copilot was flying and he was the first to see the plane. It was much closer than 1 mi at our altitude and converging rapidly. There was no time to react and the plane flew just under and behind us. None of us could determine the exact amount of feet that separated us. Could not the sdf approach control note that a midair with a VFR aircraft is the same as with an IFR aircraft. We do not yet have collision avoidance equipment on our aircraft, but if we did I might understand how a controller could expect us to evade an airplane we do not have visibility contact with. A vector around traffic would have been appreciated in this case.

Original NASA ASRS Text

Title: WHILE CRUISING AT 10000' REPORTER ACFT HAD A NMAC WITH A SMALL TWIN ENG JET ACFT.

Narrative: WE WERE CRUISING AT 10000' OVER ABB VORTAC WHEN SDF APCH CTL (I THINK FREQ 120.5) CALLED VFR TFC, 1-2 O'CLOCK AT 10000'. I TOLD THE CREW 'THAT IS OUR ALT,' AND WE ALL LOOKED FOR HIM. THE COPLT WAS FLYING AND HE WAS THE FIRST TO SEE THE PLANE. IT WAS MUCH CLOSER THAN 1 MI AT OUR ALT AND CONVERGING RAPIDLY. THERE WAS NO TIME TO REACT AND THE PLANE FLEW JUST UNDER AND BEHIND US. NONE OF US COULD DETERMINE THE EXACT AMOUNT OF FEET THAT SEPARATED US. COULD NOT THE SDF APCH CTL NOTE THAT A MIDAIR WITH A VFR ACFT IS THE SAME AS WITH AN IFR ACFT. WE DO NOT YET HAVE COLLISION AVOIDANCE EQUIP ON OUR ACFT, BUT IF WE DID I MIGHT UNDERSTAND HOW A CTLR COULD EXPECT US TO EVADE AN AIRPLANE WE DO NOT HAVE VIS CONTACT WITH. A VECTOR AROUND TFC WOULD HAVE BEEN APPRECIATED IN THIS CASE.

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.

While cruising at 10000' reporter aircraft had a near midair collision with a small twin engine jet aircraft.