Large transport descended 1000' too far.

Attributes
ACN	176464
Time
Date	199104
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : baf
State Reference	MA
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 175 flight time total : 7000 flight time type : 870
ASRS Report	176464
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

As we descended from FL200, we were given 12000' as the altitude to maintain. The boston center gave us the local altimeter setting of 29.34, as we descended through FL180. We, in error, put 30.34 in the altimeter windows, which resulted in a deviation of 1000' below the assigned altitude of 12000'.

Original NASA ASRS Text

Title: LGT DESCENDED 1000' TOO FAR.

Narrative: AS WE DSNDED FROM FL200, WE WERE GIVEN 12000' AS THE ALT TO MAINTAIN. THE BOSTON CTR GAVE US THE LCL ALTIMETER SETTING OF 29.34, AS WE DSNDED THROUGH FL180. WE, IN ERROR, PUT 30.34 IN THE ALTIMETER WINDOWS, WHICH RESULTED IN A DEV OF 1000' BELOW THE ASSIGNED ALT OF 12000'.

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.