A descending air carrier light transport turboprop almost meets, head on, a VFR climbing C550. Near midair collision avoided by rapid climb of the light transport air carrier. TA not given by sps approach military controller.

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Attributes
ACN	426798
Time
Date	199901
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : law
State Reference	OK
Altitude	msl bound lower : 8500 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Flight Phase	descent other
Route In Use	enroute airway : sps
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 6000 flight time type : 2000
ASRS Report	426798
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : nmac non adherence : far non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Consequence	Other
Miss Distance	horizontal : 750 vertical : 300
Supplementary
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

From 12000 ft we were cleared to descend to 6000 ft by sheppard approach. I (the first officer) was flying, and began a 1000 FPM descent. About 9500 ft, I was alerted by the TCASII of an aircraft climbing and heading toward us. We got a TA and I began to slow my descent to about 500 FPM. The TA quickly became an RA directing us to climb. I began climbing at a rate of more than 2500 FPM, beginning at 8500 ft or so. We kept receiving the RA telling us to climb through 10000 ft. I noticed on the TCASII that as I was climbing through 10000 ft, the other aircraft's altitude was 9700 ft. The other aircraft was a CE500 climbing out of the kickapoo airport VFR. He contacted sheppard approach in the air to pick up an IFR clearance. Sheppard approach was in contact with the CE500 before the event occurred, and at one point, as I was evading the citation, he reported us in sight. I doubt he ever saw us in time to have avoided the collision. Without the TCASII, this surely would have ended in tragedy.

Original NASA ASRS Text

Title: A DSNDING ACR LTT TURBOPROP ALMOST MEETS, HEAD ON, A VFR CLBING C550. NMAC AVOIDED BY RAPID CLB OF THE LTT ACR. TA NOT GIVEN BY SPS APCH MIL CTLR.

Narrative: FROM 12000 FT WE WERE CLRED TO DSND TO 6000 FT BY SHEPPARD APCH. I (THE FO) WAS FLYING, AND BEGAN A 1000 FPM DSCNT. ABOUT 9500 FT, I WAS ALERTED BY THE TCASII OF AN ACFT CLBING AND HDG TOWARD US. WE GOT A TA AND I BEGAN TO SLOW MY DSCNT TO ABOUT 500 FPM. THE TA QUICKLY BECAME AN RA DIRECTING US TO CLB. I BEGAN CLBING AT A RATE OF MORE THAN 2500 FPM, BEGINNING AT 8500 FT OR SO. WE KEPT RECEIVING THE RA TELLING US TO CLB THROUGH 10000 FT. I NOTICED ON THE TCASII THAT AS I WAS CLBING THROUGH 10000 FT, THE OTHER ACFT'S ALT WAS 9700 FT. THE OTHER ACFT WAS A CE500 CLBING OUT OF THE KICKAPOO ARPT VFR. HE CONTACTED SHEPPARD APCH IN THE AIR TO PICK UP AN IFR CLRNC. SHEPPARD APCH WAS IN CONTACT WITH THE CE500 BEFORE THE EVENT OCCURRED, AND AT ONE POINT, AS I WAS EVADING THE CITATION, HE RPTED US IN SIGHT. I DOUBT HE EVER SAW US IN TIME TO HAVE AVOIDED THE COLLISION. WITHOUT THE TCASII, THIS SURELY WOULD HAVE ENDED IN TRAGEDY.

Data retrieved from NASA's ASRS site as of July 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.