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A forker 100 on initial climb passing 1000 ft AGL with autoplt engaged had the aircraft pitch nose up uncommanded to approximately 25 degrees.
| Attributes | |
| ACN | 496525 |
| Time | |
| Date | 200101 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mdt.airport |
| State Reference | PA |
| Altitude | agl single value : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mdt.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : initial |
| Route In Use | departure : other published ifr departure |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 102 flight time total : 19000 flight time type : 3002 |
| ASRS Report | 496525 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 8500 flight time type : 813 |
| ASRS Report | 496199 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : stab 1 and 2 warning other flight crewa other flight crewb |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : diverted to another airport |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Aircraft Environmental Factor |
| Primary Problem | Aircraft |
Narrative:
On takeoff passing 1000 AGL aircraft pitched up to approximately 25 degrees nose up. Airspeed started to bleed off. Disconnected autoplt. Received stabilizer 1 and 2 warning (stabilizer trim 1 and 2) MFDU message. Controled trim with trim wheel. Returned to mdt airport and landed overweight. 91600 pounds. Didn't declare emergency, however equipment was rolled. Callback conversation with reporter revealed the following information: the reporter stated when the aircraft was on the ground, maintenance replaced numerous components but I didn't think anything mechanical failed. The reporter stated the aircraft autoplt was in altitude capture mode with flaps extended. The company had the flight test crew fly the aircraft all day and could not duplicate the report. The reporter said the first officer and myself with a flight instructor flew the simulator for three hours and could duplicate the event only one time.
Original NASA ASRS Text
Title: A FORKER 100 ON INITIAL CLB PASSING 1000 FT AGL WITH AUTOPLT ENGAGED HAD THE ACFT PITCH NOSE UP UNCOMMANDED TO APPROX 25 DEGS.
Narrative: ON TKOF PASSING 1000 AGL ACFT PITCHED UP TO APPROX 25 DEGS NOSE UP. AIRSPEED STARTED TO BLEED OFF. DISCONNECTED AUTOPLT. RECEIVED STAB 1 AND 2 WARNING (STAB TRIM 1 AND 2) MFDU MSG. CTLED TRIM WITH TRIM WHEEL. RETURNED TO MDT ARPT AND LANDED OVERWT. 91600 LBS. DIDN'T DECLARE EMER, HOWEVER EQUIP WAS ROLLED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED WHEN THE ACFT WAS ON THE GND, MAINT REPLACED NUMEROUS COMPONENTS BUT I DIDN'T THINK ANYTHING MECHANICAL FAILED. THE RPTR STATED THE ACFT AUTOPLT WAS IN ALT CAPTURE MODE WITH FLAPS EXTENDED. THE COMPANY HAD THE FLT TEST CREW FLY THE ACFT ALL DAY AND COULD NOT DUPLICATE THE RPT. THE RPTR SAID THE FO AND MYSELF WITH A FLT INSTRUCTOR FLEW THE SIMULATOR FOR THREE HRS AND COULD DUPLICATE THE EVENT ONLY ONE TIME.
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.