An medium large transport had a less than standard separation situation at 23000 ft. The intruder was not seen visually or announced by ATC. The crew climbed in response to a TCASII command.

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Attributes
ACN	219731
Time
Date	199208
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : clt
State Reference	NC
Altitude	msl bound lower : 23000 msl bound upper : 23600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 1200
ASRS Report	219731
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 20000 flight time type : 600
ASRS Report	219600
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

While proceeding direct shine intersection and approximately 105 mi away (west) we received a TA on traffic at 1 O'clock approximately 8 mi. No visual contact. Traffic moved to 2 O'clock, 5 mi, and was climbing into our altitude. We received an RA and voice command to 'climb!' we immediately started a climb and advised ATC of 'TCASII alert and was climbing.' still no visual contact. We climbed to approximately 23500 ft, 500 ft above assigned altitude and leveled. Traffic stopped climb approximately 500 ft below us, and passed off the right and behind. Still no visual contact. We returned to assigned altitude. Supplemental information from acn 219600: the first officer was out the window the whole time trying to get a visual. According to TCASII, the intruder passed off our right side 400-500 ft below and 1/2- 3/4 mi off our right. ATC never said he showed any target in our area and he switched us to another frequency. Very shortly thereafter.

Original NASA ASRS Text

Title: AN MLG HAD A LTSS SITUATION AT 23000 FT. THE INTRUDER WAS NOT SEEN VISUALLY OR ANNOUNCED BY ATC. THE CREW CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: WHILE PROCEEDING DIRECT SHINE INTXN AND APPROX 105 MI AWAY (W) WE RECEIVED A TA ON TFC AT 1 O'CLOCK APPROX 8 MI. NO VISUAL CONTACT. TFC MOVED TO 2 O'CLOCK, 5 MI, AND WAS CLBING INTO OUR ALT. WE RECEIVED AN RA AND VOICE COMMAND TO 'CLB!' WE IMMEDIATELY STARTED A CLB AND ADVISED ATC OF 'TCASII ALERT AND WAS CLBING.' STILL NO VISUAL CONTACT. WE CLBED TO APPROX 23500 FT, 500 FT ABOVE ASSIGNED ALT AND LEVELED. TFC STOPPED CLB APPROX 500 FT BELOW US, AND PASSED OFF THE R AND BEHIND. STILL NO VISUAL CONTACT. WE RETURNED TO ASSIGNED ALT. SUPPLEMENTAL INFO FROM ACN 219600: THE FO WAS OUT THE WINDOW THE WHOLE TIME TRYING TO GET A VISUAL. ACCORDING TO TCASII, THE INTRUDER PASSED OFF OUR R SIDE 400-500 FT BELOW AND 1/2- 3/4 MI OFF OUR R. ATC NEVER SAID HE SHOWED ANY TARGET IN OUR AREA AND HE SWITCHED US TO ANOTHER FREQ. VERY SHORTLY THEREAFTER.

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.