Narrative:

I was pilot flying from the right seat (sic) on a day time ferry flight to 42J. On the way; we reviewed the airport diagram; notams; etc. Since this was an unfamiliar field for both of us. The PIC pointed out that runway 5-23 was closed. This was the longer; wider and preferred runway of the two available. So; 11-29 was our only option to land. The winds were favoring 29.this runway was 4;900 ft and change by 75 ft; very close to the operating limitations for the citation X. First red flag. The PIC also read a bullet point for runway 11-29 that stated that the maximum weight for that runway was 12;500 pounds. 2nd red flag. He called dispatch; because at this time; we were both ready to divert instead. Dispatch called down to 42J; and the operations manager there said that it's ok to land on 11-29; despite the note. 3rd red flag.we pressed on and planned to land on runway 29. After being vectored around the restricted area by jacksonville center; we had the field in sight; canceled IFR; and proceeded toward a left base for 29. On short final; we noticed orange flags; or cones; across the runway; just past the beginning of the runway. We saw work trucks off to the left. A voice came on unicom; and asked if we knew about the displaced threshold? The PIC answered that we did; since we both could see the flags/cones across the runway. That; to us; was the displaced threshold. We landed just beyond the flags/cones uneventfully; rolled out normally; and taxied into the FBO. The airport manager parked us; and then told us that we landed about 800 ft short of the displaced threshold.up until this point; the PIC and I had no idea that we did anything wrong. Looking back on it; as soon as those orange flags/cones came into sight; I wasn't really looking beyond that. The runway was short and narrow; and I was focused on landing and getting the airplane stopped. The displaced threshold markings did not stand out at all. But; we looked at the notams again and found that the last one stated a displaced threshold 1;160 ft for runway 29.this was absolutely not intentional; but could've easily been avoided. I honestly don't think we should even be going into 42J until they reopen 5-23. If 11-29 is really ok to land on; then; the bullet point of 12;500 pounds maximum should be taken off the chart. Gainesville; fl was a stone's throw away. Most importantly; we should have read the notams more carefully. We probably should have landed on runway 11; and rolled into the displacement. The displaced threshold at 42J was hard to pick up. Maybe installing reils at the displacement will make it more noticeable.

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Original NASA ASRS Text

Title: A C750 flight crew landed short of the displaced threshold at a non-towered airport.

Narrative: I was pilot flying from the right seat (SIC) on a day time ferry flight to 42J. On the way; we reviewed the airport diagram; NOTAMs; etc. since this was an unfamiliar field for both of us. The PIC pointed out that Runway 5-23 was closed. This was the longer; wider and preferred runway of the two available. So; 11-29 was our only option to land. The winds were favoring 29.This runway was 4;900 FT and change by 75 FT; very close to the operating limitations for the Citation X. First red flag. The PIC also read a bullet point for Runway 11-29 that stated that the maximum weight for that runway was 12;500 LBS. 2nd red flag. He called Dispatch; because at this time; we were both ready to divert instead. Dispatch called down to 42J; and the Operations Manager there said that it's OK to land on 11-29; despite the note. 3rd red flag.We pressed on and planned to land on Runway 29. After being vectored around the restricted area by Jacksonville Center; we had the field in sight; canceled IFR; and proceeded toward a left base for 29. On short final; we noticed orange flags; or cones; across the runway; just past the beginning of the runway. We saw work trucks off to the left. A voice came on UNICOM; and asked if we knew about the displaced threshold? The PIC answered that we did; since we both could see the flags/cones across the runway. That; to us; was the displaced threshold. We landed just beyond the flags/cones uneventfully; rolled out normally; and taxied into the FBO. The Airport Manager parked us; and then told us that we landed about 800 FT short of the displaced threshold.Up until this point; the PIC and I had no idea that we did anything wrong. Looking back on it; as soon as those orange flags/cones came into sight; I wasn't really looking beyond that. The runway was short and narrow; and I was focused on landing and getting the airplane stopped. The displaced threshold markings did not stand out at all. But; we looked at the NOTAMs again and found that the last one stated a displaced threshold 1;160 FT for Runway 29.This was absolutely not intentional; but could've easily been avoided. I honestly don't think we should even be going into 42J until they reopen 5-23. If 11-29 is really OK to land on; then; the bullet point of 12;500 LBS maximum should be taken off the chart. Gainesville; FL was a stone's throw away. Most importantly; we should have read the NOTAMs more carefully. We probably should have landed on Runway 11; and rolled into the displacement. The displaced threshold at 42J was hard to pick up. Maybe installing REILS at the displacement will make it more noticeable.

Data retrieved from NASA's ASRS site as of April 2012 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.