Falcon 20FJF/20C/20D/20E/20F
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe
General None Reported / Taken
Human Factors; Aircraft
On approach into SHV runway 14; after autopilot disengaged; I flew from approximately 2000 FT AGL to short final using what felt like more aft pressure than normal; maintaining controllability and remaining on approach profile and proper airspeed. Upon landing at 20 FT AGL during the landing flare I stated to my Captain that the yoke had hit the aft stop. A normal landing occurred. During the 'after landing' checklist it was observed that the trim was in the full nose down position; and could not be returned to the takeoff position using normal trim. Emergency trim worked normally allowing the crew to move the trim to the normal takeoff position. Upon reengaging the normal trim circuit breaker the trim drove itself to the full nose down position again.
Falcon 20 First Officer reported noticing abnormally high nose down tendency on approach; and after landing stabilizer trim was found in full nose down position. Trimming nose up with the normal system had no effect; but emergency trim did work.