Narrative:

Flight abcd to isp, we were descending from FL240 ft, cleared to cross intersection dunce at 9000 ft. I went off radio to obtain ATIS at islip. I briefed landing information: winds were '300 degrees at 18 KTS gusting to 20 KTS. Altimeter 29.54.' captain queried winds again, then set altimeter on left and center to 30.54. While completing descent checklist through FL180, I matched 30.54 on my side. We crossed dunee at 8000 ft AGL instead of 9000 ft. Our continued descent from 9000-4000 ft involved handoff to boston, then quickly to new york approach. The altimeter setting was corrected on contacting new york approach before reaching 4000 ft. Factors for incident: 1) late night/fatigue. 2) poor communication between captain/first officer. 3) I should have been more attentive to the information I copied on ATIS. Our xchk needed improvement.

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Original NASA ASRS Text

Title: AN ALTIMETER SETTING ERROR RESULTS IN DSCNT BELOW ASSIGNED ALT.

Narrative: FLT ABCD TO ISP, WE WERE DSNDING FROM FL240 FT, CLRED TO CROSS INTXN DUNCE AT 9000 FT. I WENT OFF RADIO TO OBTAIN ATIS AT ISLIP. I BRIEFED LNDG INFO: WINDS WERE '300 DEGS AT 18 KTS GUSTING TO 20 KTS. ALTIMETER 29.54.' CAPT QUERIED WINDS AGAIN, THEN SET ALTIMETER ON L AND CTR TO 30.54. WHILE COMPLETING DSCNT CHKLIST THROUGH FL180, I MATCHED 30.54 ON MY SIDE. WE CROSSED DUNEE AT 8000 FT AGL INSTEAD OF 9000 FT. OUR CONTINUED DSCNT FROM 9000-4000 FT INVOLVED HDOF TO BOSTON, THEN QUICKLY TO NEW YORK APCH. THE ALTIMETER SETTING WAS CORRECTED ON CONTACTING NEW YORK APCH BEFORE REACHING 4000 FT. FACTORS FOR INCIDENT: 1) LATE NIGHT/FATIGUE. 2) POOR COM BTWN CAPT/FO. 3) I SHOULD HAVE BEEN MORE ATTENTIVE TO THE INFO I COPIED ON ATIS. OUR XCHK NEEDED IMPROVEMENT.

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.