CL65 flight crew has wrong altimeter set and descends 1000 ft below assigned altitude.

Attributes
ACN	570865
Time
Date	200301
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : btv.airport
State Reference	VT
Altitude	msl single value : 7000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zbw.artcc tracon : btv.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 14000 flight time type : 5000
ASRS Report	570865
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Experience	controller military : 3 flight time last 90 days : 200 flight time total : 3000 flight time type : 2000
ASRS Report	571020
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were beginning our descent into burlington, vt, airport. We had picked up the ATIS and the first officer noted the altimeter setting was 29.22 inches. We both discussed this and said it sounded lower than normal. We were handed off to ZBW, I was given an altimeter setting of 30.22 inches, which the first officer read back with no correction from the controller. We were then handed off to btv approach and was given a descent to 7000 ft. ATC asked us our altitude, and we responded 7000 ft. He then asked us our altimeter setting, and we stated 30.22 inches. He then corrected us to say it was 29.22 inches. We corrected the setting and climbed to 7000 ft, since due to our error on the altimeter setting, we were actually at 6000 ft. I normally always xchk the ATIS altimeter settings with what is given by ATC, but unfortunately did not doublechked with the controller when given a different setting. Thankfully, the mistake was uneventful. I certainly take responsibility for our part in the error. It would have been helpful if btv approach has given us a current altimeter setting on our initial call and should have noticed our 1000 ft altitude difference when we checked in with our altitude reading. Also, if we did read back an incorrect altimeter setting with ZBW, it would have been good if he caught it, but we both believe we heard 30.22 inches from ZBW.

Original NASA ASRS Text

Title: CL65 FLT CREW HAS WRONG ALTIMETER SET AND DSNDS 1000 FT BELOW ASSIGNED ALT.

Narrative: WE WERE BEGINNING OUR DSCNT INTO BURLINGTON, VT, ARPT. WE HAD PICKED UP THE ATIS AND THE FO NOTED THE ALTIMETER SETTING WAS 29.22 INCHES. WE BOTH DISCUSSED THIS AND SAID IT SOUNDED LOWER THAN NORMAL. WE WERE HANDED OFF TO ZBW, I WAS GIVEN AN ALTIMETER SETTING OF 30.22 INCHES, WHICH THE FO READ BACK WITH NO CORRECTION FROM THE CTLR. WE WERE THEN HANDED OFF TO BTV APCH AND WAS GIVEN A DSCNT TO 7000 FT. ATC ASKED US OUR ALT, AND WE RESPONDED 7000 FT. HE THEN ASKED US OUR ALTIMETER SETTING, AND WE STATED 30.22 INCHES. HE THEN CORRECTED US TO SAY IT WAS 29.22 INCHES. WE CORRECTED THE SETTING AND CLBED TO 7000 FT, SINCE DUE TO OUR ERROR ON THE ALTIMETER SETTING, WE WERE ACTUALLY AT 6000 FT. I NORMALLY ALWAYS XCHK THE ATIS ALTIMETER SETTINGS WITH WHAT IS GIVEN BY ATC, BUT UNFORTUNATELY DID NOT DOUBLECHKED WITH THE CTLR WHEN GIVEN A DIFFERENT SETTING. THANKFULLY, THE MISTAKE WAS UNEVENTFUL. I CERTAINLY TAKE RESPONSIBILITY FOR OUR PART IN THE ERROR. IT WOULD HAVE BEEN HELPFUL IF BTV APCH HAS GIVEN US A CURRENT ALTIMETER SETTING ON OUR INITIAL CALL AND SHOULD HAVE NOTICED OUR 1000 FT ALT DIFFERENCE WHEN WE CHKED IN WITH OUR ALT READING. ALSO, IF WE DID READ BACK AN INCORRECT ALTIMETER SETTING WITH ZBW, IT WOULD HAVE BEEN GOOD IF HE CAUGHT IT, BUT WE BOTH BELIEVE WE HEARD 30.22 INCHES FROM ZBW.

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.