Narrative:

A mistakenly heard 29.93 on the ATIS and wrote this on the landing data card which caused both pilots to set the wrong altimeter (correct was 29.53). We were never questioned by my agency about our altitude but on final approach I heard 29.53 and questioned the captain. We both reset our altimeters with no resulting problems. Lessons learned: we have ACARS on the aircraft. Montreal (yul) is not ATIS equipped for ACARS. We were able to get an 'unofficial' company WX update that actually had the correct altimeter setting. Since this is an unofficial source, I only used it for the winds, ceiling and visibility. In the future, I will use it to xchk altimeters.

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Original NASA ASRS Text

Title: DC9 CREW MISSET QNH ON DSCNT INTO CYMX.

Narrative: A MISTAKENLY HEARD 29.93 ON THE ATIS AND WROTE THIS ON THE LNDG DATA CARD WHICH CAUSED BOTH PLTS TO SET THE WRONG ALTIMETER (CORRECT WAS 29.53). WE WERE NEVER QUESTIONED BY MY AGENCY ABOUT OUR ALT BUT ON FINAL APCH I HEARD 29.53 AND QUESTIONED THE CAPT. WE BOTH RESET OUR ALTIMETERS WITH NO RESULTING PROBS. LESSONS LEARNED: WE HAVE ACARS ON THE ACFT. MONTREAL (YUL) IS NOT ATIS EQUIPPED FOR ACARS. WE WERE ABLE TO GET AN 'UNOFFICIAL' COMPANY WX UPDATE THAT ACTUALLY HAD THE CORRECT ALTIMETER SETTING. SINCE THIS IS AN UNOFFICIAL SOURCE, I ONLY USED IT FOR THE WINDS, CEILING AND VISIBILITY. IN THE FUTURE, I WILL USE IT TO XCHK ALTIMETERS.

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.