TCASII RA causes light transport PIC to create an altitude deviation altitude excursion.

Attributes
ACN	215633
Time
Date	199207
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cgt
State Reference	IL
Altitude	msl bound lower : 8000 msl bound upper : 8400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau artcc : zob
Operator	common carrier : air carrier
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : atp pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 5000 flight time type : 400
ASRS Report	215633
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 other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Received TA 11 O'clock, minus 400 ft. Next received RA 'monitor vertical speed.' we questioned ATC about traffic and he confirmed that traffic had 'popped up' and was in process of giving us vectors when RA 'climb, climb now' was issued. We climbed through 8400 when 'clear of conflict' was issued. Descended back to 8000 ft without incident. Traffic was never confirmed visually.

Original NASA ASRS Text

Title: TCASII RA CAUSES LTT PIC TO CREATE AN ALTDEV ALT EXCURSION.

Narrative: RECEIVED TA 11 O'CLOCK, MINUS 400 FT. NEXT RECEIVED RA 'MONITOR VERT SPD.' WE QUESTIONED ATC ABOUT TFC AND HE CONFIRMED THAT TFC HAD 'POPPED UP' AND WAS IN PROCESS OF GIVING US VECTORS WHEN RA 'CLB, CLB NOW' WAS ISSUED. WE CLBED THROUGH 8400 WHEN 'CLR OF CONFLICT' WAS ISSUED. DSNDED BACK TO 8000 FT WITHOUT INCIDENT. TFC WAS NEVER CONFIRMED VISUALLY.

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.