Narrative:

I was the first officer/PF on the nottingham 3 arrival to bwi. We were given a clearance to descend to FL190 at csn. While in the low 200's we were given a new clearance to descend to 150 ft. Later the controller came back on the radio and said the crossing of FL190 at csn still applies. The captain acknowledged since he was the PNF. At approximately FL210 and 10-15 mi from csn I gave him the aircraft so I could make the descent PA. When I came back in the loop he said we had missed our crossing at csn, apparently a few ft too low. He had understood the clearance to mean csn at or below FL190. It appears we had crossed at about 18700 to 18500 ft. I took control of the aircraft back from him and continued our descent to 15000 ft. There appears to have been no traffic conflict and no TCASII alerts. Looks like late night, long day, readback, hearback error applies in this case. Lesson learned when a controller modifies a crossing restr confirm exactly how he wants it.

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Original NASA ASRS Text

Title: MD80 CREW MISSED A DSCNT ALT XING RESTR.

Narrative: I WAS THE FO/PF ON THE NOTTINGHAM 3 ARR TO BWI. WE WERE GIVEN A CLRNC TO DSND TO FL190 AT CSN. WHILE IN THE LOW 200'S WE WERE GIVEN A NEW CLRNC TO DSND TO 150 FT. LATER THE CTLR CAME BACK ON THE RADIO AND SAID THE XING OF FL190 AT CSN STILL APPLIES. THE CAPT ACKNOWLEDGED SINCE HE WAS THE PNF. AT APPROX FL210 AND 10-15 MI FROM CSN I GAVE HIM THE ACFT SO I COULD MAKE THE DSCNT PA. WHEN I CAME BACK IN THE LOOP HE SAID WE HAD MISSED OUR XING AT CSN, APPARENTLY A FEW FT TOO LOW. HE HAD UNDERSTOOD THE CLRNC TO MEAN CSN AT OR BELOW FL190. IT APPEARS WE HAD CROSSED AT ABOUT 18700 TO 18500 FT. I TOOK CTL OF THE ACFT BACK FROM HIM AND CONTINUED OUR DSCNT TO 15000 FT. THERE APPEARS TO HAVE BEEN NO TFC CONFLICT AND NO TCASII ALERTS. LOOKS LIKE LATE NIGHT, LONG DAY, READBACK, HEARBACK ERROR APPLIES IN THIS CASE. LESSON LEARNED WHEN A CTLR MODIFIES A XING RESTR CONFIRM EXACTLY HOW HE WANTS IT.

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.