Narrative:

The primary cause of this operational error was a failure of all primary transmitters at aus approach for approximately 2 mins. The failure occurred while the involved aircraft being vectored to ILS 31L localizer, approximately 10 mi southeast of the robert mueller airport. Air carrier X was TCASII equipped, but TCASII was inoperative during this occurrence. Current flight plan information did not reflect the inoperative status of the TCASII. As the flight crew did not advise ATC that the TCASII was inoperative, the computer stored flight plan led me to believe that the air carrier was operating with a functional TCASII. My actions would not have changed based on TCASII availability in this situation, but knowing what equipment was available could have been beneficial.

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Original NASA ASRS Text

Title: ATC EQUIP PROB RADIO XMITTER FAILED LOSS OF COM WITH ACR X AND SMT Y ON RADAR VECTORS IN IMC. LTSS BTWN ACR X AND CPR Y. SYS ERROR.

Narrative: THE PRIMARY CAUSE OF THIS OPERROR WAS A FAILURE OF ALL PRIMARY XMITTERS AT AUS APCH FOR APPROX 2 MINS. THE FAILURE OCCURRED WHILE THE INVOLVED ACFT BEING VECTORED TO ILS 31L LOC, APPROX 10 MI SE OF THE ROBERT MUELLER ARPT. ACR X WAS TCASII EQUIPPED, BUT TCASII WAS INOP DURING THIS OCCURRENCE. CURRENT FLT PLAN INFO DID NOT REFLECT THE INOP STATUS OF THE TCASII. AS THE FLC DID NOT ADVISE ATC THAT THE TCASII WAS INOP, THE COMPUTER STORED FLT PLAN LED ME TO BELIEVE THAT THE ACR WAS OPERATING WITH A FUNCTIONAL TCASII. MY ACTIONS WOULD NOT HAVE CHANGED BASED ON TCASII AVAILABILITY IN THIS SIT, BUT KNOWING WHAT EQUIP WAS AVAILABLE COULD HAVE BEEN BENEFICIAL.

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.