Narrative:

While on an IFR flight plan in actual IMC from hub, tx, to ads, tx, I was radar vectored by dallas regional approach. I was instructed to use the ads NDB 15 approach into addison. The WX had deteriorated to 600 ft 2 mi with rain and fog. The approach controller vectored me on a 90 degree intercept to the NDB with an approximately heading of 255 degrees. He instructed me to report when established and contact tower. The NDB 15 inbound course is 154 degrees and upon reaching the NDB, I made a sharp turn to the left to intercept the inbound course. We reported inbound and called ads tower. I received missed approach instructions to climb runway heading and climb to 3000 ft MSL. I began a descent to 1100 ft MSL as published. At approximately 1500 ft MSL the ADF needle began to swing and provided erroneous information. I called missed approach to my safety pilot. At this time ads tower screamed 'aircraft X, what are you doing?' we reported missed approach and switched to dallas approach. We checked in and reported climbing to 3000 ft MSL and were told to descend immediately to 2000 ft MSL. We complied and we then asked for sequencing for the ILS into dfw. We received clearance and landed at dfw. I was told to contact dallas TRACON via telephone. I called and spoke with the TRACON supervisor and explained what had occurred. He said no further action was required. The aircraft was flown back by a CFI who squawked the aircraft ADF for being unreliable. He reported it reporting 20 degrees off course. I reviewed my logbook and realized that I was not current to exercise the privileges of PIC and carry a passenger. The other pilot was on board as a licensed private multi IFR safety pilot.

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Original NASA ASRS Text

Title: A BE76 PLT RPT ON A POTENTIAL CONFLICT OCCURRING WHEN HIS ADF SUPPLIED ERRONEOUS INFO DURING HIS APCH TO ADS, TX.

Narrative: WHILE ON AN IFR FLT PLAN IN ACTUAL IMC FROM HUB, TX, TO ADS, TX, I WAS RADAR VECTORED BY DALLAS REGIONAL APCH. I WAS INSTRUCTED TO USE THE ADS NDB 15 APCH INTO ADDISON. THE WX HAD DETERIORATED TO 600 FT 2 MI WITH RAIN AND FOG. THE APCH CTLR VECTORED ME ON A 90 DEG INTERCEPT TO THE NDB WITH AN APPROX HDG OF 255 DEGS. HE INSTRUCTED ME TO RPT WHEN ESTABLISHED AND CONTACT TWR. THE NDB 15 INBOUND COURSE IS 154 DEGS AND UPON REACHING THE NDB, I MADE A SHARP TURN TO THE L TO INTERCEPT THE INBOUND COURSE. WE RPTED INBOUND AND CALLED ADS TWR. I RECEIVED MISSED APCH INSTRUCTIONS TO CLB RWY HDG AND CLB TO 3000 FT MSL. I BEGAN A DSCNT TO 1100 FT MSL AS PUBLISHED. AT APPROX 1500 FT MSL THE ADF NEEDLE BEGAN TO SWING AND PROVIDED ERRONEOUS INFO. I CALLED MISSED APCH TO MY SAFETY PLT. AT THIS TIME ADS TWR SCREAMED 'ACFT X, WHAT ARE YOU DOING?' WE RPTED MISSED APCH AND SWITCHED TO DALLAS APCH. WE CHKED IN AND RPTED CLBING TO 3000 FT MSL AND WERE TOLD TO DSND IMMEDIATELY TO 2000 FT MSL. WE COMPLIED AND WE THEN ASKED FOR SEQUENCING FOR THE ILS INTO DFW. WE RECEIVED CLRNC AND LANDED AT DFW. I WAS TOLD TO CONTACT DALLAS TRACON VIA TELEPHONE. I CALLED AND SPOKE WITH THE TRACON SUPVR AND EXPLAINED WHAT HAD OCCURRED. HE SAID NO FURTHER ACTION WAS REQUIRED. THE ACFT WAS FLOWN BACK BY A CFI WHO SQUAWKED THE ACFT ADF FOR BEING UNRELIABLE. HE RPTED IT RPTING 20 DEGS OFF COURSE. I REVIEWED MY LOGBOOK AND REALIZED THAT I WAS NOT CURRENT TO EXERCISE THE PRIVILEGES OF PIC AND CARRY A PAX. THE OTHER PLT WAS ON BOARD AS A LICENSED PVT MULTI IFR SAFETY PLT.

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.