MD11 landing paris descends below assigned altitude at transition altitude.

Attributes
ACN	598758
Time
Date	200311
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lfpg.airport
State Reference	FO
Altitude	msl bound lower : 3500 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lfpg.tracon
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 8r
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 3500 flight time type : 700
ASRS Report	598758
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 60 flight time total : 5600 flight time type : 1500
ASRS Report	598760
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : automation overrode flight crew flight crew : overrode automation flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On base leg for ILS runway 8R at cdg airport (paris, france) we were cleared to descend to 4000 ft (transition level). As we were cleared for the ILS approach, as the altimeter setting was made, the FMS did not honor the 4000 ft altitude selected and we descended to approximately 3600 ft. The captain took control of the aircraft, disengaged the autoplt and regained the lost altitude. No other aircraft were involved and the correction was immediate.

Original NASA ASRS Text

Title: MD11 LNDG PARIS DSNDS BELOW ASSIGNED ALT AT TRANSITION ALT.

Narrative: ON BASE LEG FOR ILS RWY 8R AT CDG ARPT (PARIS, FRANCE) WE WERE CLRED TO DSND TO 4000 FT (TRANSITION LEVEL). AS WE WERE CLRED FOR THE ILS APCH, AS THE ALTIMETER SETTING WAS MADE, THE FMS DID NOT HONOR THE 4000 FT ALT SELECTED AND WE DSNDED TO APPROX 3600 FT. THE CAPT TOOK CTL OF THE ACFT, DISENGAGED THE AUTOPLT AND REGAINED THE LOST ALT. NO OTHER ACFT WERE INVOLVED AND THE CORRECTION WAS IMMEDIATE.

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.