Lear 45 flight crew has a TCAS RA while in a descent.

Attributes
ACN	718910
Time
Date	200612
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : bum.vortac
State Reference	MO
Altitude	msl single value : 38000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zkc.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 45
Operating Under FAR Part	Part 91
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zkc.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 45
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : cfi pilot : atp
Experience	flight time last 90 days : 60 flight time total : 3200 flight time type : 700
ASRS Report	718910
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

I was the captain on a learjet 45; air carrier X; on a flight to ict. I was on kansas city center frequency as well as another company airplane (air carrier Y). We (air carrier X) were given a descent to FL340 and responded with our full call sign. The copilot who was the PF; began the descent and at approximately FL382 we received a 'TA.' the copilot leveled at FL380 and a B737 passed directly below us at FL370. I queried ATC that we had been cleared to FL340 and ATC advised to maintain FL380. Nothing else was said by ATC in respect to our clearance to FL340. We continued on to ict without further incident. Once on the ground at ict I contacted a manager at kansas city center and advised him of the situation and asked for an explanation. After pulling the ATC tapes the manager at kc center advised me that the controller had gotten our aircraft (air carrier X) and our other company aircraft on frequency (air carrier Y) mixed up. We (air carrier X) were given an incorrect clearance to FL340 by the controller.

Original NASA ASRS Text

Title: LEAR 45 FLT CREW HAS A TCAS RA WHILE IN A DSCNT.

Narrative: I WAS THE CAPT ON A LEARJET 45; ACR X; ON A FLT TO ICT. I WAS ON KANSAS CITY CTR FREQ AS WELL AS ANOTHER COMPANY AIRPLANE (ACR Y). WE (ACR X) WERE GIVEN A DSCNT TO FL340 AND RESPONDED WITH OUR FULL CALL SIGN. THE COPLT WHO WAS THE PF; BEGAN THE DSCNT AND AT APPROXIMATELY FL382 WE RECEIVED A 'TA.' THE COPLT LEVELED AT FL380 AND A B737 PASSED DIRECTLY BELOW US AT FL370. I QUERIED ATC THAT WE HAD BEEN CLRED TO FL340 AND ATC ADVISED TO MAINTAIN FL380. NOTHING ELSE WAS SAID BY ATC IN RESPECT TO OUR CLRNC TO FL340. WE CONTINUED ON TO ICT WITHOUT FURTHER INCIDENT. ONCE ON THE GND AT ICT I CONTACTED A MANAGER AT KANSAS CITY CTR AND ADVISED HIM OF THE SITUATION AND ASKED FOR AN EXPLANATION. AFTER PULLING THE ATC TAPES THE MANAGER AT KC CTR ADVISED ME THAT THE CTLR HAD GOTTEN OUR ACFT (ACR X) AND OUR OTHER COMPANY ACFT ON FREQ (ACR Y) MIXED UP. WE (ACR X) WERE GIVEN AN INCORRECT CLRNC TO FL340 BY THE CTLR.

Data retrieved from NASA's ASRS site as of January 2009 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.