A Dassault Falcon 900EX corporate jet, registration N823RC, experienced a landing gear collapse subsequent to an aborted takeoff attempt from runway 28R at Montgomery-Gibbs Exec Airport (MYF/KMYF), San Diego, California. The airplane sustained substantial damage and the five occupants onboard were not injured. The flight crew later stated that at rotation speed, the captain applied back pressure to the control yoke; however, the nose did not rotate to a takeoff attitude. The captain attempted to rotate the airplane once more by relaxing the yoke then pulling it back again, and, with no change in the airplane’s attitude, he made the decision to reject the takeoff by retarding the thrust levers and applying maximum braking. The airplane overran the end of the runway onto a gravel pad where the landing gear collapsed. The NTSB reported that the captain did not have a valid pilot certificate. A review of airmen records revealed that the FAA had issued an emergency revocation of all his certificates 2 years earlier on February 13, 2019. FAA records indicated that the reason for the emergency revocation was because he had falsified logbook entries and records for pilot proficiency checks, competency checks, and training events on 15 separate occasions while employed as a check pilot for a Part 135 operator. Probable Cause: The flight crew’s operation of the airplane outside of the manufacturer’s specified weight and balance limitations and with an improper trim setting, which resulted in the airplane’s inability to rotate during the attempted takeoff. Contributing to the accident, was the captain’s lack of proper certification and the crew’s lack of flight experience in the airplane make and model.