A B737-700 on climb at 3000 ft declared an emergency and diverted due to stabilizer trim jammed at 7 degrees nose up. Caused by main electric trim actuator failure.

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Attributes
ACN	527623
Time
Date	200110
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 4000
ASRS Report	527623
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 195 flight time total : 11000 flight time type : 1500
ASRS Report	527053
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Departing ZZZ out of 3000 ft, stabilizer jammed at 7 degrees nose up. All manual trim and electric trim were jammed. Completed all checklists, declared emergency, obtained vectors to ZZZ with successful landing per QRH. Maintenance found stabilizer jammed. Would like to know why manual did not work either. I will be investigating myself. Callback conversation with reporter revealed the following information: the reporter stated that all modes of stabilizer trim had failed at 7 degrees nose up. The reporter said the manual wheels could not be moved and when on the ground, technicians also attempted movement with no success. The reporter stated the main electric trim actuator was replaced and the airplane returned to service. The reporter said the NTSB has impounded the main electric trim actuator to determine why this actuator failure could cause failure of the other 2 backup system. The reporter stated no report on the findings has been issued by the NTSB.

Original NASA ASRS Text

Title: A B737-700 ON CLB AT 3000 FT DECLARED AN EMER AND DIVERTED DUE TO STABILIZER TRIM JAMMED AT 7 DEGS NOSE UP. CAUSED BY MAIN ELECTRIC TRIM ACTUATOR FAILURE.

Narrative: DEPARTING ZZZ OUT OF 3000 FT, STABILIZER JAMMED AT 7 DEGS NOSE UP. ALL MANUAL TRIM AND ELECTRIC TRIM WERE JAMMED. COMPLETED ALL CHKLISTS, DECLARED EMER, OBTAINED VECTORS TO ZZZ WITH SUCCESSFUL LNDG PER QRH. MAINT FOUND STABILIZER JAMMED. WOULD LIKE TO KNOW WHY MANUAL DID NOT WORK EITHER. I WILL BE INVESTIGATING MYSELF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT ALL MODES OF STABILIZER TRIM HAD FAILED AT 7 DEGS NOSE UP. THE RPTR SAID THE MANUAL WHEELS COULD NOT BE MOVED AND WHEN ON THE GND, TECHNICIANS ALSO ATTEMPTED MOVEMENT WITH NO SUCCESS. THE RPTR STATED THE MAIN ELECTRIC TRIM ACTUATOR WAS REPLACED AND THE AIRPLANE RETURNED TO SVC. THE RPTR SAID THE NTSB HAS IMPOUNDED THE MAIN ELECTRIC TRIM ACTUATOR TO DETERMINE WHY THIS ACTUATOR FAILURE COULD CAUSE FAILURE OF THE OTHER 2 BACKUP SYS. THE RPTR STATED NO RPT ON THE FINDINGS HAS BEEN ISSUED BY THE NTSB.

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.