Narrative:

As we joined the localizer at 4000 ft, we had 2 TA's on our TCASII in our turn. We received a climb command and climbed approximately 500 ft and the command terminated. We advised approach control of our climb and the reason. He said he had no aircraft out there. I saw 1 of the 2 that were displayed on the TCASII. This was the second RA on 2 successive legs in 1 day. Both were authenticated by visual contact.

Google
 

Original NASA ASRS Text

Title: FLC OF ACR LGT DEVIATED FROM ASSIGNED APCH ALT IN RESPONSE TO A TCASII RA.

Narrative: AS WE JOINED THE LOC AT 4000 FT, WE HAD 2 TA'S ON OUR TCASII IN OUR TURN. WE RECEIVED A CLB COMMAND AND CLBED APPROX 500 FT AND THE COMMAND TERMINATED. WE ADVISED APCH CTL OF OUR CLB AND THE REASON. HE SAID HE HAD NO ACFT OUT THERE. I SAW 1 OF THE 2 THAT WERE DISPLAYED ON THE TCASII. THIS WAS THE SECOND RA ON 2 SUCCESSIVE LEGS IN 1 DAY. BOTH WERE AUTHENTICATED BY VISUAL CONTACT.

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.