Narrative:

Landing in medford, or, in low light conditions (dusk). The threshold on runway 32 was temporarily displaced 3000 ft for construction. There were barricades in place 2000 ft from the original threshold, providing a 1000 ft safety zone for the workers in the construction area. The captain thought the barricades marked the new threshold. We skimmed over the barricades at what I considered 'a little too low,' but I thought the captain was attempting to land 'on the numbers' of the new threshold. This seemed prudent to me since the runway was now shortened to 5200 ft -- very short for a B737! We touched down about an airplane's length short of the real displaced threshold. There was no risk of damage or injury, but this was a clear case of miscom. I knew where the real displaced threshold was and just assumed the captain did also. I could have confirmed that he knew about the barricades at 2000 ft and the new threshold at 3000 ft. Also, the newly painted threshold was difficult to see, especially coming in on a flat approach (there was no PAPI or VASI).

Related reports:

Google
 

Original NASA ASRS Text

Title: B737 LANDS ON PROTECTED, DISPLACED THRESHOLD 2000 FT FROM RWY APCH END INSTEAD OF AT THE 3000 FT MARKER WHERE THE INTENDED RWY BEGINS.

Narrative: LNDG IN MEDFORD, OR, IN LOW LIGHT CONDITIONS (DUSK). THE THRESHOLD ON RWY 32 WAS TEMPORARILY DISPLACED 3000 FT FOR CONSTRUCTION. THERE WERE BARRICADES IN PLACE 2000 FT FROM THE ORIGINAL THRESHOLD, PROVIDING A 1000 FT SAFETY ZONE FOR THE WORKERS IN THE CONSTRUCTION AREA. THE CAPT THOUGHT THE BARRICADES MARKED THE NEW THRESHOLD. WE SKIMMED OVER THE BARRICADES AT WHAT I CONSIDERED 'A LITTLE TOO LOW,' BUT I THOUGHT THE CAPT WAS ATTEMPTING TO LAND 'ON THE NUMBERS' OF THE NEW THRESHOLD. THIS SEEMED PRUDENT TO ME SINCE THE RWY WAS NOW SHORTENED TO 5200 FT -- VERY SHORT FOR A B737! WE TOUCHED DOWN ABOUT AN AIRPLANE'S LENGTH SHORT OF THE REAL DISPLACED THRESHOLD. THERE WAS NO RISK OF DAMAGE OR INJURY, BUT THIS WAS A CLR CASE OF MISCOM. I KNEW WHERE THE REAL DISPLACED THRESHOLD WAS AND JUST ASSUMED THE CAPT DID ALSO. I COULD HAVE CONFIRMED THAT HE KNEW ABOUT THE BARRICADES AT 2000 FT AND THE NEW THRESHOLD AT 3000 FT. ALSO, THE NEWLY PAINTED THRESHOLD WAS DIFFICULT TO SEE, ESPECIALLY COMING IN ON A FLAT APCH (THERE WAS NO PAPI OR VASI).

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.