Other / Unknown
Aircraft Equipment Problem Critical
Flight Crew Took Evasive Action; Flight Crew Landed in Emergency Condition; Flight Crew Executed Go Around / Missed Approach; Flight Crew FLC complied w / Automation / Advisory; General Declared Emergency
Aircraft; Human Factors
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.
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.