<< >> NASA ASRS Report 1163392, April 2014

A B777 was cleared to cross ramob intersection on the eddf arrival at FL110. Both pilots confirmed the MCP altitude window at FL110 but somehow FL100 became active so ATC called about the aircraft's failure to level at FL110.

Attributes
ACN	1163392
Time
Date	201404
Local Time Of Day	0601-1200
Place
Locale Reference	EDDF.Airport
State Reference	FO
Environment
Light	Dawn
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	MCP
Person 1
Function	Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance

Narrative:

On arrival to eddf; we were cleared to cross ramob at FL110. FL110 was set in altitude window and confirmed by pilot flying and pilot not flying. Subsequently received call from ATC verifying crossing restriction when realizing we were passing FL107. At that time discovered FL100 had appeared in altitude set window without pilot input. Returned to FL110 and continued without further incident and no further comment from eddf ATC.I suggest we monitor/crosscheck automation and aircraft performance; avoid distractions.

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Original NASA ASRS Text

Title: A B777 was cleared to cross RAMOB Intersection on the EDDF arrival at FL110. Both pilots confirmed the MCP altitude window at FL110 but somehow FL100 became active so ATC called about the aircraft's failure to level at FL110.

Narrative: On arrival to EDDF; we were cleared to cross RAMOB at FL110. FL110 was set in altitude window and confirmed by pilot flying and pilot not flying. Subsequently received call from ATC verifying crossing restriction when realizing we were passing FL107. At that time discovered FL100 had appeared in altitude set window without pilot input. Returned to FL110 and continued without further incident and no further comment from EDDF ATC.I suggest we monitor/crosscheck automation and aircraft performance; avoid distractions.

Data retrieved from NASA's ASRS site 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.