Air carrier light transport at cruise has TCASII RA.

Attributes
ACN	277234
Time
Date	199407
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : crl
State Reference	MI
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : instrument
Experience	flight time last 90 days : 350 flight time total : 4500 flight time type : 250
ASRS Report	277234
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
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	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Cruise flight at 11000 ft a TCASII RA instructed a climb at a rate of 2000-2500 FPM to avoid an aircraft climbing beneath us. We initiated a climb, at approximately 12000 ft the RA cleared. We began a descent to 11000 ft and notified center of the RA. They said they did show traffic for us, but they had not called it to our attention until we queried them. A visual on the conflicting traffic was not established. Center frequently had been very busy.

Original NASA ASRS Text

Title: ACR LTT AT CRUISE HAS TCASII RA.

Narrative: CRUISE FLT AT 11000 FT A TCASII RA INSTRUCTED A CLB AT A RATE OF 2000-2500 FPM TO AVOID AN ACFT CLBING BENEATH US. WE INITIATED A CLB, AT APPROX 12000 FT THE RA CLRED. WE BEGAN A DSCNT TO 11000 FT AND NOTIFIED CTR OF THE RA. THEY SAID THEY DID SHOW TFC FOR US, BUT THEY HAD NOT CALLED IT TO OUR ATTN UNTIL WE QUERIED THEM. A VISUAL ON THE CONFLICTING TFC WAS NOT ESTABLISHED. CTR FREQUENTLY HAD BEEN VERY BUSY.

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.