Medium large transport small transport have near midair collision.

Attributes
ACN	88484
Time
Date	198806
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ict
State Reference	KS
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 30500 flight time type : 1400
ASRS Report	88484
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 5000
ASRS Report	88614
Events
Anomaly	conflict : nmac
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Executed a descent to cross the 35 DME southeast of ilt VOR at 10000'. Kansas city ARTCC advised us of unknown VFR traffic at 10-11 O'clock reporting altitude of 10200'. Then the controllers advised us the traffic was reporting 11000'. I called 'rogon traffic in sight.' we were then cleared to contact wichita approach control which I did. As I looked down to shift radio frequencys saw the first officer start a descending turn to the right. I looked back up and saw the traffic that was at 11000' had put his gear down and started a nose over maneuver. It was a twin propeller t-tail with tip tanks. I reported this to wichita approach control as by this time we had descended to 9500' without clearance. I suspect that it was a test flight. Thank god for altitude encoders and thanks to kansas city center for telling us. I suggest a special area for test flight in the wichita area for the manufacturers there as well as the air force.

Original NASA ASRS Text

Title: MLG SMT HAVE NMAC.

Narrative: EXECUTED A DESCENT TO CROSS THE 35 DME SE OF ILT VOR AT 10000'. KANSAS CITY ARTCC ADVISED US OF UNKNOWN VFR TFC AT 10-11 O'CLOCK REPORTING ALT OF 10200'. THEN THE CTLRS ADVISED US THE TFC WAS REPORTING 11000'. I CALLED 'ROGON TFC IN SIGHT.' WE WERE THEN CLRED TO CONTACT WICHITA APCH CTL WHICH I DID. AS I LOOKED DOWN TO SHIFT RADIO FREQS SAW THE F/O START A DESCENDING TURN TO THE RIGHT. I LOOKED BACK UP AND SAW THE TFC THAT WAS AT 11000' HAD PUT HIS GEAR DOWN AND STARTED A NOSE OVER MANEUVER. IT WAS A TWIN PROP T-TAIL WITH TIP TANKS. I REPORTED THIS TO WICHITA APCH CTL AS BY THIS TIME WE HAD DESCENDED TO 9500' WITHOUT CLRNC. I SUSPECT THAT IT WAS A TEST FLT. THANK GOD FOR ALT ENCODERS AND THANKS TO KANSAS CITY CENTER FOR TELLING US. I SUGGEST A SPECIAL AREA FOR TEST FLT IN THE WICHITA AREA FOR THE MANUFACTURERS THERE AS WELL AS THE AIR FORCE.

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.