Flight crew altitude deviation altitude overshot in descent procedure. Altimeters set for qne too soon in foreign airspace. Non adherence to ATC clearance.

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Attributes
ACN	352333
Time
Date	199611
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lgw
State Reference	FO
Altitude	msl bound lower : 12660 msl bound upper : 13000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : egtt
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	352333
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	352264
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While descending from 15000 ft to 13000 ft for landing in lgw, we were completing the landing checklist. Altimeters were called out and the landing altimeter of 30.32 was set and the qnh was set for the landing. The altimeter was then set back to 29.92. That was when I noticed the aircraft had leveled off at 12660 ft while the altimeters were being reset. I immediately climbed back to 13000 ft. Nothing was said by london control and the WX was clear, 30 mi. No other aircraft was in sight. No apparent conflicts happened with ATC or any other aircraft.

Original NASA ASRS Text

Title: FLC ALTDEV ALT OVERSHOT IN DSCNT PROC. ALTIMETERS SET FOR QNE TOO SOON IN FOREIGN AIRSPACE. NON ADHERENCE TO ATC CLRNC.

Narrative: WHILE DSNDING FROM 15000 FT TO 13000 FT FOR LNDG IN LGW, WE WERE COMPLETING THE LNDG CHKLIST. ALTIMETERS WERE CALLED OUT AND THE LNDG ALTIMETER OF 30.32 WAS SET AND THE QNH WAS SET FOR THE LNDG. THE ALTIMETER WAS THEN SET BACK TO 29.92. THAT WAS WHEN I NOTICED THE ACFT HAD LEVELED OFF AT 12660 FT WHILE THE ALTIMETERS WERE BEING RESET. I IMMEDIATELY CLBED BACK TO 13000 FT. NOTHING WAS SAID BY LONDON CTL AND THE WX WAS CLR, 30 MI. NO OTHER ACFT WAS IN SIGHT. NO APPARENT CONFLICTS HAPPENED WITH ATC OR ANY OTHER ACFT.

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.