A TCASII dictated excursion from assigned altitude in class a airspace.

Attributes
ACN	507570
Time
Date	200104
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zob.artcc
State Reference	OH
Altitude	msl bound lower : 26000 msl bound upper : 27300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 6000 flight time type : 1500
ASRS Report	507570
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : required legal separation
Resolutory Action	flight crew : returned to assigned altitude flight crew : took evasive action
Miss Distance	horizontal : 13200 vertical : 1000
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

Cruising FL260. Received a TA at approximately 10 mi distance. RA was given by TCASII to climb at 1500 FPM. Noticed an aircraft at FL270 at our 4 O'clock position and approximately 7 mi. We climbed to FL273 and then advised center of our deviation, returned to FL260 without further problems.

Original NASA ASRS Text

Title: A TCASII DICTATED EXCURSION FROM ASSIGNED ALT IN CLASS A AIRSPACE.

Narrative: CRUISING FL260. RECEIVED A TA AT APPROX 10 MI DISTANCE. RA WAS GIVEN BY TCASII TO CLB AT 1500 FPM. NOTICED AN ACFT AT FL270 AT OUR 4 O'CLOCK POS AND APPROX 7 MI. WE CLBED TO FL273 AND THEN ADVISED CTR OF OUR DEV, RETURNED TO FL260 WITHOUT FURTHER PROBS.

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.