An air carrier medium large transport climbed in response to a TCASII command.

Attributes
ACN	262080
Time
Date	199401
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ekr
State Reference	CO
Altitude	msl bound lower : 29000 msl bound upper : 29400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 250 flight time total : 12000 flight time type : 2600
ASRS Report	262080
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 1400
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

We were at FL290 and received an RA from the TCASII of 'traffic, traffic, climb, climb, monitor vertical speed.' the first officer was flying and began a 1300 FPM. I called ZDV and asked if they had any traffic. He said there was an aircraft that just leveled at FL280, we stopped the climb at 29400 and descended back to fl 290. Apparently the other aircraft had a high rate of climb approaching FL280 and the TCASII assumed he would climb into our airspace. This is one of the drawbacks of the TCASII system, however, overall it is a good tool.

Original NASA ASRS Text

Title: AN ACR MLG CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: WE WERE AT FL290 AND RECEIVED AN RA FROM THE TCASII OF 'TFC, TFC, CLB, CLB, MONITOR VERT SPD.' THE FO WAS FLYING AND BEGAN A 1300 FPM. I CALLED ZDV AND ASKED IF THEY HAD ANY TFC. HE SAID THERE WAS AN ACFT THAT JUST LEVELED AT FL280, WE STOPPED THE CLB AT 29400 AND DSNDED BACK TO FL 290. APPARENTLY THE OTHER ACFT HAD A HIGH RATE OF CLB APCHING FL280 AND THE TCASII ASSUMED HE WOULD CLB INTO OUR AIRSPACE. THIS IS ONE OF THE DRAWBACKS OF THE TCASII SYS, HOWEVER, OVERALL IT IS A GOOD TOOL.

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.