NYC06IA075 · Dassault Aviation Falcon 900EX

The Falcon 900EX, was being flown by the co-pilot from the left seat, and was landing on runway 24, a 6,013-foot-long, 150-foot-wide, asphalt runway. Witnesses reported the airplane touched down about halfway down the runway, the airplane then traveled off the end, and came to rest in mud, about 330 feet from the end of the runway. Tire marks consistent with the airplane's tires were observed to begin about 1,000 feet prior to the end of the runway. The airplane sustained damage to the landing gear assemblies, and the right outboard slat. Post-incident examination of the braking system did not reveal any evidence of a preimpact malfunction. It was noted that the landing gear tachometer generators were found to be out-of-tolerance during portions of a test procedure. The specific reason for the out-of-tolerance condition was not determined; however, it may be attributed to damage sustained during the overrun, or post incident disassembly. According to the airplane manufacturer, the out-of-tolerance conditions found with respect to the tachometer generators would have resulted in no significant adverse consequence (less than 1-percent) on the overall performance of the braking system. The airplane's flight data recorder showed that the flight crew did not utilize the airplane's air brake after touchdown, which would have reduced lift, and improved braking effectiveness during the high speed phase of the landing run. The airplane's total ground roll travel after touchdown was approximately 3,522 feet. A weather observation taken after the incident reported the winds from 330 degrees, at 19 knots, gusting to 26 knots. Post-incident friction tests conducted on the runway, revealed friction levels, which would not have required the issuance of a notice to airmen; however, some small patches of snow/ice were observed on the runway surface.

Verbatim NTSB analysis and probable cause from the NTSB dataset