B767 crew had altitude overshoot when they set qnh in inches instead of hpa.

Attributes
ACN	491930
Time
Date	200011
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lfpg.airport
State Reference	FO
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lfpg.tracon tower : lga.tower
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	491930
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	491062
Events
Anomaly	altitude deviation : overshoot non adherence : company policies non adherence : clearance non adherence : far non adherence : published procedure other spatial deviation
Independent Detector	atc equipment : msaw atc equipment other atc equipment : atc radar other controllera
Resolutory Action	flight crew : became reoriented flight crew : returned to assigned altitude flight crew : executed go around none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Company Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Altitude bust. During approach to cdg, controller issued altitude setting. First officer read back setting and controller acknowledged setting. Myself, first officer, and international relief officer all confirmed what we thought we heard 29.85. 29.85 was set in the baro window when in fact the correct setting was 0985 and should have been set in the millibar window. Our clearance was to maintain 4000 ft and intercept the localizer. The controller asked our altitude and then gave us the altimeter setting again. After resetting we were at 3000 ft. We were given a clearance to climb to 4000 ft and intercept the localizer. There were not any other aircraft in close proximity to us nor did we get any TCASII alerts.

Original NASA ASRS Text

Title: B767 CREW HAD ALT OVERSHOOT WHEN THEY SET QNH IN INCHES INSTEAD OF HPA.

Narrative: ALT BUST. DURING APCH TO CDG, CTLR ISSUED ALT SETTING. FO READ BACK SETTING AND CTLR ACKNOWLEDGED SETTING. MYSELF, FO, AND IRO ALL CONFIRMED WHAT WE THOUGHT WE HEARD 29.85. 29.85 WAS SET IN THE BARO WINDOW WHEN IN FACT THE CORRECT SETTING WAS 0985 AND SHOULD HAVE BEEN SET IN THE MILLIBAR WINDOW. OUR CLRNC WAS TO MAINTAIN 4000 FT AND INTERCEPT THE LOC. THE CTLR ASKED OUR ALT AND THEN GAVE US THE ALTIMETER SETTING AGAIN. AFTER RESETTING WE WERE AT 3000 FT. WE WERE GIVEN A CLRNC TO CLB TO 4000 FT AND INTERCEPT THE LOC. THERE WERE NOT ANY OTHER ACFT IN CLOSE PROX TO US NOR DID WE GET ANY TCASII ALERTS.

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.