LJ31 flight crew with ZID experienced TCASII RA at FL230; receiving no traffic information from ATC.

Attributes
ACN	647553
Time
Date	200502
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : tvt.vor
State Reference	OH
Altitude	msl single value : 23000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 31
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 4500
ASRS Report	647553
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

While cruising at FL230; TCASII advisories went off. The TA and subsequent RA occurred at FL230 within 15-30 seconds. The TCASII advised us to climb at 1200 FPM. After passing through FL235; TCASII advised us conflict clear and we descended back to FL230 and advised center of the RA. While attempting to locate traffic conflict visually; center tried to contact us several times with a frequency change. After the third attempt and less than 1 min after the initial TA we responded to center and advised them of the RA. We were told to remain on current frequency and after 30-60 seconds; told to contact indy on 124.45. The remaining flight was without incident. During the TA/RA we were talking to ZID on 123.92.

Original NASA ASRS Text

Title: LJ31 FLT CREW WITH ZID EXPERIENCED TCASII RA AT FL230; RECEIVING NO TFC INFO FROM ATC.

Narrative: WHILE CRUISING AT FL230; TCASII ADVISORIES WENT OFF. THE TA AND SUBSEQUENT RA OCCURRED AT FL230 WITHIN 15-30 SECONDS. THE TCASII ADVISED US TO CLB AT 1200 FPM. AFTER PASSING THROUGH FL235; TCASII ADVISED US CONFLICT CLR AND WE DSNDED BACK TO FL230 AND ADVISED CTR OF THE RA. WHILE ATTEMPTING TO LOCATE TFC CONFLICT VISUALLY; CTR TRIED TO CONTACT US SEVERAL TIMES WITH A FREQ CHANGE. AFTER THE THIRD ATTEMPT AND LESS THAN 1 MIN AFTER THE INITIAL TA WE RESPONDED TO CTR AND ADVISED THEM OF THE RA. WE WERE TOLD TO REMAIN ON CURRENT FREQ AND AFTER 30-60 SECONDS; TOLD TO CONTACT INDY ON 124.45. THE REMAINING FLT WAS WITHOUT INCIDENT. DURING THE TA/RA WE WERE TALKING TO ZID ON 123.92.

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.