Narrative:

I checked in and informed approach that I was level at 3000 ft on the localizer runway 27 approach. About 1-2 mins after I checked in on 121.0 I got the light and oral sound on the OM beacon panel. I started my watch and started to descend. I checked my time during my scan and :36 seconds had elapsed. About :30 seconds later ATC called and told me to climb and maintain 3000 ft. I immediately applied power and started a climb back to 3000 ft. I informed ATC that I had gotten an OM light and tone and had started my descent on the approach. Approach informed me that I was 3 NM east of hobo and to maintain 3000 until hobo, cleared for the localizer runway 27 approach. I informed him that I was leaving 2400 for 3000 and was cleared for the approach. From the time approach on 119.3 initially cleared me for the approach 13 mi east of hobo until approach on 121.0 told me to climb back to 3000, approximately 7 mins had passed. When I got on the ground I started to look at the en route and approach plates. I knew peachtree dekalb was southeast off mccollum. Looking at the approach plates for pdk I found that they have an ILS runway 20L approach and the OM is chamb 5.5 NM from the threshold. Chamb was what I was receiving when I started my initial descent and not hobo. I feel that this could be a potentially dangerous situation for pilots that are not familiar with the area and the different approachs into the other airports. So this type of mistake does not happen again, I think that ATC should advise pilots of the possibility of receiving chamb OM when on the ryy localizer runway 27 approach, or publish a radial off of the pdk or atl VOR for a more precise identify of hobo OM.

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Original NASA ASRS Text

Title: SMA ON LOC APCH DSNDS UPON PASSING OM. CTLR TELLS TO CLB TO ASSIGNED AS HAS NOT PASSED OM. FALSE SIGNAL.

Narrative: I CHKED IN AND INFORMED APCH THAT I WAS LEVEL AT 3000 FT ON THE LOC RWY 27 APCH. ABOUT 1-2 MINS AFTER I CHKED IN ON 121.0 I GOT THE LIGHT AND ORAL SOUND ON THE OM BEACON PANEL. I STARTED MY WATCH AND STARTED TO DSND. I CHKED MY TIME DURING MY SCAN AND :36 SECONDS HAD ELAPSED. ABOUT :30 SECONDS LATER ATC CALLED AND TOLD ME TO CLB AND MAINTAIN 3000 FT. I IMMEDIATELY APPLIED PWR AND STARTED A CLB BACK TO 3000 FT. I INFORMED ATC THAT I HAD GOTTEN AN OM LIGHT AND TONE AND HAD STARTED MY DSCNT ON THE APCH. APCH INFORMED ME THAT I WAS 3 NM E OF HOBO AND TO MAINTAIN 3000 UNTIL HOBO, CLRED FOR THE LOC RWY 27 APCH. I INFORMED HIM THAT I WAS LEAVING 2400 FOR 3000 AND WAS CLRED FOR THE APCH. FROM THE TIME APCH ON 119.3 INITIALLY CLRED ME FOR THE APCH 13 MI E OF HOBO UNTIL APCH ON 121.0 TOLD ME TO CLB BACK TO 3000, APPROX 7 MINS HAD PASSED. WHEN I GOT ON THE GND I STARTED TO LOOK AT THE ENRTE AND APCH PLATES. I KNEW PEACHTREE DEKALB WAS SE OFF MCCOLLUM. LOOKING AT THE APCH PLATES FOR PDK I FOUND THAT THEY HAVE AN ILS RWY 20L APCH AND THE OM IS CHAMB 5.5 NM FROM THE THRESHOLD. CHAMB WAS WHAT I WAS RECEIVING WHEN I STARTED MY INITIAL DSCNT AND NOT HOBO. I FEEL THAT THIS COULD BE A POTENTIALLY DANGEROUS SITUATION FOR PLTS THAT ARE NOT FAMILIAR WITH THE AREA AND THE DIFFERENT APCHS INTO THE OTHER ARPTS. SO THIS TYPE OF MISTAKE DOES NOT HAPPEN AGAIN, I THINK THAT ATC SHOULD ADVISE PLTS OF THE POSSIBILITY OF RECEIVING CHAMB OM WHEN ON THE RYY LOC RWY 27 APCH, OR PUBLISH A RADIAL OFF OF THE PDK OR ATL VOR FOR A MORE PRECISE IDENT OF HOBO OM.

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.