On final at 1;800 ft a md-80 horizontal stabilizer motor ran full nose down; so a jumpseat rider ass...

Narrative:

I was the jumpseat rider on the flight. Uneventful flight until visual approach; we had a runaway stabilizer full nose down on approximately 10-15 mile final. Captain executed a go-around and flew another approach to a visual landing. Due to excessive forward stick pressures; I assisted by pulling back on the captain's yolk during the go-around; pattern and approach and landing to allow the captain to maintain aircraft control. I also assisted with QRH checklist items and with briefing the flight attendants.

Original NASA ASRS Text

Title: On final at 1;800 FT a MD-80 Horizontal Stabilizer motor ran full nose down; so a jumpseat rider assisted the Captain pulling the yoke during the go-around and to another approach and landing. An emergency was declared and the QRH completed.

Narrative: I was the jumpseat rider on the flight. Uneventful flight until visual approach; we had a runaway stabilizer full nose down on approximately 10-15 mile final. Captain executed a go-around and flew another approach to a visual landing. Due to excessive forward stick pressures; I assisted by pulling back on the Captain's yolk during the go-around; pattern and approach and landing to allow the Captain to maintain aircraft control. I also assisted with QRH checklist items and with briefing the flight attendants.

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.

Attributes
ACN	1167439
Time
Date	201404
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Horizontal Stabilizer Trim Motor
Person 1
Function	Other / Unknown
Events
Anomaly	Aircraft Equipment Problem Critical

On final at 1;800 ft a md-80 horizontal stabilizer motor ran full nose down; so a jumpseat rider assisted the captain pulling the yoke during the go-around and to another approach and landing. An emergency was declared and the QRH completed.