DC9 crew misset qnh on descent into cymx.

Attributes
ACN	473462
Time
Date	200005
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cymx.airport
State Reference	PQ
Altitude	agl bound lower : 800 msl bound upper : 18000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 600 flight time type : 1100
ASRS Report	473462
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 11500 flight time type : 4500
ASRS Report	473200
Events
Anomaly	altitude deviation : undershoot non adherence : published procedure non adherence : company policies non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

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.

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.