B747 flight crew reports unscheduled stabilizer trim EICAS; and after complying with QRH procedures and a second occurrence; declares an emergency and returns to departure airport.

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Attributes
ACN	767142
Time
Date	200702
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	msl single value : 38000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzzz.artcc
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	DVR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 4500
ASRS Report	767142
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa
Resolutory Action	flight crew : declared emergency other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

B747-400. Level at 38000 ft. 20 mins into cruise the EICAS 'stabilizer trim unscheduled' illuminated. Performed QRH and continued. 20 mins later stabilizer trim unscheduled. Continued with QRH and consulted with company. Turned around and declared emergency. 'Stabilizer trim unscheduled' illuminated for the 3RD time and when autoplt was disconnected the aircraft pitched up. Hand flew to ZZZZ and landed.

Original NASA ASRS Text

Title: B747 FLT CREW REPORTS UNSCHEDULED STAB TRIM EICAS; AND AFTER COMPLYING WITH QRH PROCEDURES AND A SECOND OCCURRENCE; DECLARES AN EMERGENCY AND RETURNS TO DEPARTURE ARPT.

Narrative: B747-400. LEVEL AT 38000 FT. 20 MINS INTO CRUISE THE EICAS 'STABILIZER TRIM UNSCHEDULED' ILLUMINATED. PERFORMED QRH AND CONTINUED. 20 MINS LATER STABILIZER TRIM UNSCHEDULED. CONTINUED WITH QRH AND CONSULTED WITH COMPANY. TURNED AROUND AND DECLARED EMER. 'STAB TRIM UNSCHEDULED' ILLUMINATED FOR THE 3RD TIME AND WHEN AUTOPLT WAS DISCONNECTED THE ACFT PITCHED UP. HAND FLEW TO ZZZZ AND LANDED.

Data retrieved from NASA's ASRS site as of January 2009 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.