Falcon 2000
Situational Awareness
Aircraft Equipment Problem Critical
Aircraft Automation Overrode Flight Crew; Flight Crew Took Evasive Action; Flight Crew FLC complied w / Automation / Advisory; Flight Crew FLC Overrode Automation; Flight Crew Diverted; Flight Crew Landed As Precaution; General Maintenance Action
Aircraft
While climbing on profile both slats extended without being commanded. Confirmed visually. Complied with checklist. Airplane handled very well throughout entire flight. Decided to divert to a nearby airport; which has long runways and was close to where the event took place. Flaps retracted on their own through FL250. Approach and landing uneventful.
The reporter stated the .73-.74 climb profile was being flown when this event happened. The Falcon has two Angle of Attack (AOA) systems calibrated to different thresholds. If a stall were sensed; a slat extension and other stall indications would result. That was not the case here because no other stall indications or Not in Positions (NIPS) alerts were indicated. The reporter has not heard what system faulted to cause the slat extension.
During climb through FL360; M.74 a Falcon 2000 slats extended uncommanded with no abnormal handling characteristics. During descent to a divert airport; the slats retracted at about FL250. An uneventful landing was accomplished.