Potential conflict sensed by TCASII, gave RA on opposite direction climbing traffic.

Attributes
ACN	261640
Time
Date	199401
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lex
State Reference	KY
Altitude	msl bound lower : 9000 msl bound upper : 9700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cak
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute airway : lex
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 800
ASRS Report	261640
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 1200
ASRS Report	261637
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

No TA from ATC (approach control). Other aircraft was VFR ATR 8500 ft MSL and we were IFR at 9000 ft MSL. Other aircraft decided to climb through our altitude. Our TCASII equipment aircraft instructed us to 'climb.' (RA). We received a 'monitor vertical speed' instruction, at 9700 ft MSL and promptly returned to our assigned altitude when able. We expected an advisory from lex approach but received none regarding location or direction of traffic.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT SENSED BY TCASII, GAVE RA ON OPPOSITE DIRECTION CLBING TFC.

Narrative: NO TA FROM ATC (APCH CTL). OTHER ACFT WAS VFR ATR 8500 FT MSL AND WE WERE IFR AT 9000 FT MSL. OTHER ACFT DECIDED TO CLB THROUGH OUR ALT. OUR TCASII EQUIP ACFT INSTRUCTED US TO 'CLB.' (RA). WE RECEIVED A 'MONITOR VERT SPD' INSTRUCTION, AT 9700 FT MSL AND PROMPTLY RETURNED TO OUR ASSIGNED ALT WHEN ABLE. WE EXPECTED AN ADVISORY FROM LEX APCH BUT RECEIVED NONE REGARDING LOCATION OR DIRECTION OF TFC.

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.