B777 crew overshot altitude on descent to egtt.

Attributes
ACN	457423
Time
Date	199912
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : egtt.airport
State Reference	FO
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B777 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	457423
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : far non adherence : published procedure non adherence : company policies non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Missed altimeter setting. On descent from FL80 to 4000 ft given altimeter 0992, which we heard as 29.92 and did not reset altimeters. None of the three of us caught it. Leveled at 4000 ft then given 3000 ft. Leveling at 3000 ft controller noticed the error and corrected us saying altimeter 0992 millibars. We corrected up slightly and completed approach without problem. Contributing factors: 1) british accent, 2) we are used to the numbers 29.92 which is what it sounded like, and 3) controller was not using the term millibars along with the numbers -- although we still should have caught it knowing they use millibars.

Original NASA ASRS Text

Title: B777 CREW OVERSHOT ALT ON DSCNT TO EGTT.

Narrative: MISSED ALTIMETER SETTING. ON DSCNT FROM FL80 TO 4000 FT GIVEN ALTIMETER 0992, WHICH WE HEARD AS 29.92 AND DID NOT RESET ALTIMETERS. NONE OF THE THREE OF US CAUGHT IT. LEVELED AT 4000 FT THEN GIVEN 3000 FT. LEVELING AT 3000 FT CTLR NOTICED THE ERROR AND CORRECTED US SAYING ALTIMETER 0992 MILLIBARS. WE CORRECTED UP SLIGHTLY AND COMPLETED APCH WITHOUT PROB. CONTRIBUTING FACTORS: 1) BRITISH ACCENT, 2) WE ARE USED TO THE NUMBERS 29.92 WHICH IS WHAT IT SOUNDED LIKE, AND 3) CTLR WAS NOT USING THE TERM MILLIBARS ALONG WITH THE NUMBERS -- ALTHOUGH WE STILL SHOULD HAVE CAUGHT IT KNOWING THEY USE MILLIBARS.

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.