Narrative:

Had TCASII RA at 24000 ft. Climbed to 24650, alert stopped. Returned to 24000 after advising ZAU. Apparently cpr jet climbing to 23000 below us set off the alert.

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Original NASA ASRS Text

Title: WDB AT CRUISE IN CLASS A AIRSPACE HAS TCASII RA.

Narrative: HAD TCASII RA AT 24000 FT. CLBED TO 24650, ALERT STOPPED. RETURNED TO 24000 AFTER ADVISING ZAU. APPARENTLY CPR JET CLBING TO 23000 BELOW US SET OFF THE ALERT.

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.