An aircraft capable of carrying crew size 2, 128 passenger descends into the den, co, area with the wrong altimeter setting and a complacent flight crew.

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Attributes
ACN	383040
Time
Date	199710
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 10600 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den tower : las
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute airway : den
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 5000 flight time type : 1200
ASRS Report	383040
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was the first officer flying on descent into den. We were cleared to 11000 ft MSL. The dia altimeter setting was 29.46. I forgot to set that at 18000 ft so I still had 29.92 set when I leveled at 11000 ft. The captain had set 29.96 because he misread my writing of the ATIS. Den approach asked if we were level at 11000 ft. That is when we discovered our error. I started climbing and reset my altitude to 29.46. I saw 10600 ft as my altitude. We were distracted by a radio call at 18000 ft and the captain missed my altimeter setting when running the descent check. He thought his was set properly so did not notice the error I made. WX was not a factor, it was beautiful. Workload was not a factor either. I would say complacency was to blame. There was no traffic conflict and departure never said any more about it since we corrected right away.

Original NASA ASRS Text

Title: AN ACFT CAPABLE OF CARRYING CREW SIZE 2, 128 PAX DSNDS INTO THE DEN, CO, AREA WITH THE WRONG ALTIMETER SETTING AND A COMPLACENT FLC.

Narrative: I WAS THE FO FLYING ON DSCNT INTO DEN. WE WERE CLRED TO 11000 FT MSL. THE DIA ALTIMETER SETTING WAS 29.46. I FORGOT TO SET THAT AT 18000 FT SO I STILL HAD 29.92 SET WHEN I LEVELED AT 11000 FT. THE CAPT HAD SET 29.96 BECAUSE HE MISREAD MY WRITING OF THE ATIS. DEN APCH ASKED IF WE WERE LEVEL AT 11000 FT. THAT IS WHEN WE DISCOVERED OUR ERROR. I STARTED CLBING AND RESET MY ALT TO 29.46. I SAW 10600 FT AS MY ALT. WE WERE DISTRACTED BY A RADIO CALL AT 18000 FT AND THE CAPT MISSED MY ALTIMETER SETTING WHEN RUNNING THE DSCNT CHK. HE THOUGHT HIS WAS SET PROPERLY SO DID NOT NOTICE THE ERROR I MADE. WX WAS NOT A FACTOR, IT WAS BEAUTIFUL. WORKLOAD WAS NOT A FACTOR EITHER. I WOULD SAY COMPLACENCY WAS TO BLAME. THERE WAS NO TFC CONFLICT AND DEP NEVER SAID ANY MORE ABOUT IT SINCE WE CORRECTED RIGHT AWAY.

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.