B737-800 flight crew reported failure of electric stabilizer trim. An emergency was declared and an ...

Narrative:

During the descent the captain noticed the 'stabilizer out of trim' light had illuminated; and we completed the QRH procedure while I continued to fly. Afterwards; we briefly discussed the procedure for 'stabilizer trim inoperative' just in case we had a complete stabilizer trim failure. The electric trim was working with the autopilot off; however; intermittently. Shortly later; I discovered the electric trim had failed completely. At this time; the captain took control to try his electric trim with no success and then we decided to declare an emergency. From this point on; I was the pilot monitoring. We completed the 'stabilizer trim inoperative' procedure in the QRH and proceeded to the final approach fix for the [ILS approach]. The captain flew the aircraft and I controlled the trim manually based on his commands. The captain briefed the flight attendants and the passengers. The rest of the flight was completed without incident. We landed and then proceeded to check the aircraft for any other problems. None were found; so the captain terminated the emergency and we taxied to the gate.

Original NASA ASRS Text

Title: B737-800 flight crew reported failure of electric stabilizer trim. An emergency was declared and an ILS approach flown; with the F/O controlling the trim manually based on the Captain's commands.

Narrative: During the descent the Captain noticed the 'STAB OUT OF TRIM' light had illuminated; and we completed the QRH procedure while I continued to fly. Afterwards; we briefly discussed the procedure for 'Stabilizer Trim Inoperative' just in case we had a complete stabilizer trim failure. The electric trim was working with the autopilot off; however; intermittently. Shortly later; I discovered the electric trim had failed completely. At this time; the Captain took control to try his electric trim with no success and then we decided to declare an emergency. From this point on; I was the pilot monitoring. We completed the 'Stabilizer Trim Inoperative' procedure in the QRH and proceeded to the final approach fix for the [ILS approach]. The Captain flew the aircraft and I controlled the trim manually based on his commands. The Captain briefed the flight attendants and the passengers. The rest of the flight was completed without incident. We landed and then proceeded to check the aircraft for any other problems. None were found; so the Captain terminated the emergency and we taxied to the gate.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	984704
Time
Date	201112
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Horizontal Stabilizer Trim
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

B737-800 flight crew reported failure of electric stabilizer trim. An emergency was declared and an ILS approach flown; with the first officer controlling the trim manually based on the captain's commands.