Altitude deviation altitude excursion -- air carrier received a TCASII 'RA' and climbs as instructed, but the intruder levels off 2000 ft below their assigned altitude after a rapid climb.

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Attributes
ACN	304081
Time
Date	199505
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cap
State Reference	IL
Altitude	msl bound lower : 31000 msl bound upper : 32200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Talon
Operating Under FAR Part	other : other
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 62 flight time total : 7314 flight time type : 2366
ASRS Report	304081
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 3200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During cruise at FL310 we received a TCASII RA, 'climb, climb.' we complied with the 2000-2500 FPM pitch up command immediately. We notified ATC and were told a T38 had climbed to FL290 just beneath, leveling off sharply. When the TCASII no longer showed a RA/TA and controller verified there was no conflict, we descended from FL322 to FL310. No 'clear of conflict' was announced.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION -- ACR RECEIVED A TCASII 'RA' AND CLBS AS INSTRUCTED, BUT THE INTRUDER LEVELS OFF 2000 FT BELOW THEIR ASSIGNED ALT AFTER A RAPID CLB.

Narrative: DURING CRUISE AT FL310 WE RECEIVED A TCASII RA, 'CLB, CLB.' WE COMPLIED WITH THE 2000-2500 FPM PITCH UP COMMAND IMMEDIATELY. WE NOTIFIED ATC AND WERE TOLD A T38 HAD CLBED TO FL290 JUST BENEATH, LEVELING OFF SHARPLY. WHEN THE TCASII NO LONGER SHOWED A RA/TA AND CTLR VERIFIED THERE WAS NO CONFLICT, WE DSNDED FROM FL322 TO FL310. NO 'CLR OF CONFLICT' WAS ANNOUNCED.

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.