Air carrier has TCASII TA then RA. Climbs.

Attributes
ACN	195722
Time
Date	199111
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bwg
State Reference	KY
Altitude	msl bound lower : 26000 msl bound upper : 26700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 255 flight time total : 5200
ASRS Report	195722
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 9800
ASRS Report	195304
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 : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Received TA on TCASII followed immediately by RA 'climb, climb.' required 1500-2000 FPM vertical climb rate to get in green band. Climbed to 26700 before RA cleared. Descended back to 26000 ft and ATC notified of altitude deviation due to TCASII RA. ATC advised an aircraft was climbing to FL250 at time of RA. TCASII RA was unnecessary. Please discontinue TCASII RA mode and regulation until bugs are worked out. This occurrence was due solely to the shortcomings in TCASII RA software/hardware and thus causing unnecessary excursion from ATC assigned altitude. Please keep the TCASII TA mode and discontinue the error prone RA mode.

Original NASA ASRS Text

Title: ACR HAS TCASII TA THEN RA. CLBS.

Narrative: RECEIVED TA ON TCASII FOLLOWED IMMEDIATELY BY RA 'CLB, CLB.' REQUIRED 1500-2000 FPM VERT CLB RATE TO GET IN GREEN BAND. CLBED TO 26700 BEFORE RA CLRED. DSNDED BACK TO 26000 FT AND ATC NOTIFIED OF ALTDEV DUE TO TCASII RA. ATC ADVISED AN ACFT WAS CLBING TO FL250 AT TIME OF RA. TCASII RA WAS UNNECESSARY. PLEASE DISCONTINUE TCASII RA MODE AND REG UNTIL BUGS ARE WORKED OUT. THIS OCCURRENCE WAS DUE SOLELY TO THE SHORTCOMINGS IN TCASII RA SOFTWARE/HARDWARE AND THUS CAUSING UNNECESSARY EXCURSION FROM ATC ASSIGNED ALT. PLEASE KEEP THE TCASII TA MODE AND DISCONTINUE THE ERROR PRONE RA MODE.

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.