Daulphin 365, 5N-BJF was flown out of Nigerian Air Force (NAF) base, Port Harcourt on Monday the 24th of March, 2008 on a training flight to Bonny Airstrip.On arrival in Bonny, training exercise on engine failure in hover before take-off decision point (TDP) and after TDP was performed. The Captain in preparation to demonstrate Class B landing on the runway, turned final two miles from Runway 28. On Short final, he noticed a sudden drop of the helicopter about 50 feet from the ground. The sink rate was unusual and the helicopter hit the ground nine meters short of the runway threshold. The helicopter finally stopped 10 meters on the runway with the nose wheel, left main landing gear forward structure and the tail guard damaged.