Narrative:

While approaching lvj on the VOR-a circle to land, while being vectored by houston approach, I was notified that I was off of course. However, the CDI in my aircraft indicated that I was precisely on course. The following day, while VFR conditions were present, I flew the VOR-a approach into clover. The CDI indicated that I was precisely on the 260 degree radial from the trinity VOR. During this flight, and also prior to this flight, it was brought to my attention that the 25.0 DME puts you approximately 3 mi west of clover field. In doing the math, from the 21.0 DME from trinity, which depicts the final approach fix (iftif), is idented by the 131 degree radial out of hobby (hub), you would have to descend at approximately 1500 FPM to arrive at the airport. Callback conversation with reporter revealed the following information: pilot did not have much additional information to add. He did state that, when the DME in the aircraft read 25 mi, you were about 3 mi past the airport. He further stated that several other pilots had the same experience.

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Original NASA ASRS Text

Title: C210 PLT RPTS THAT THE CHARTED POS OF LVJ ARPT DOES NOT COINCIDE WITH THE DME MEASURED POS.

Narrative: WHILE APCHING LVJ ON THE VOR-A CIRCLE TO LAND, WHILE BEING VECTORED BY HOUSTON APCH, I WAS NOTIFIED THAT I WAS OFF OF COURSE. HOWEVER, THE CDI IN MY ACFT INDICATED THAT I WAS PRECISELY ON COURSE. THE FOLLOWING DAY, WHILE VFR CONDITIONS WERE PRESENT, I FLEW THE VOR-A APCH INTO CLOVER. THE CDI INDICATED THAT I WAS PRECISELY ON THE 260 DEG RADIAL FROM THE TRINITY VOR. DURING THIS FLT, AND ALSO PRIOR TO THIS FLT, IT WAS BROUGHT TO MY ATTN THAT THE 25.0 DME PUTS YOU APPROX 3 MI W OF CLOVER FIELD. IN DOING THE MATH, FROM THE 21.0 DME FROM TRINITY, WHICH DEPICTS THE FINAL APCH FIX (IFTIF), IS IDENTED BY THE 131 DEG RADIAL OUT OF HOBBY (HUB), YOU WOULD HAVE TO DSND AT APPROX 1500 FPM TO ARRIVE AT THE ARPT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: PLT DID NOT HAVE MUCH ADDITIONAL INFO TO ADD. HE DID STATE THAT, WHEN THE DME IN THE ACFT READ 25 MI, YOU WERE ABOUT 3 MI PAST THE ARPT. HE FURTHER STATED THAT SEVERAL OTHER PLTS HAD THE SAME EXPERIENCE.

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.