Narrative:

I was the first officer for flight to mdst. When we intercepted the localizer for runway 11 at 12 DME; we descended from 4000 ft to 2500 ft. We told mdst tower that we were established on final and that we had the runway in sight. At 9 DME; we lost our DME indications for a couple of seconds. When the DME came it was indicating 12 DME. At that point tower clears us for the visual approach for runway 11. We advised the tower about the DME. The tower said they were working on it. No NOTAMS are published. It is unknown why the event occurred. We cross checked the DME with the GPS; and we advised the tower. Please publish all NAVAID NOTAMS.

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Original NASA ASRS Text

Title: AN ACR CREW REPORTS MDST DME MOMENTARILY FAILED THEN RETURNED WITH A DIFFERENT DISTANCE. NO NOTAMS ABOUT THE DME NAVAID WERE ISSUED.

Narrative: I WAS THE FO FOR FLT TO MDST. WHEN WE INTERCEPTED THE LOCALIZER FOR RWY 11 AT 12 DME; WE DESCENDED FROM 4000 FT TO 2500 FT. WE TOLD MDST TWR THAT WE WERE ESTABLISHED ON FINAL AND THAT WE HAD THE RWY IN SIGHT. AT 9 DME; WE LOST OUR DME INDICATIONS FOR A COUPLE OF SECONDS. WHEN THE DME CAME IT WAS INDICATING 12 DME. AT THAT POINT TWR CLEARS US FOR THE VISUAL APCH FOR RWY 11. WE ADVISED THE TWR ABOUT THE DME. THE TWR SAID THEY WERE WORKING ON IT. NO NOTAMS ARE PUBLISHED. IT IS UNKNOWN WHY THE EVENT OCCURRED. WE CROSS CHKED THE DME WITH THE GPS; AND WE ADVISED THE TWR. PLEASE PUBLISH ALL NAVAID NOTAMS.

Data retrieved from NASA's ASRS site as of May 2009 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.