What happened
On April 11, 2008, at approximately 07:00 A.M., a Robinson R44 helicopter, registration HI-740, was engaged in agricultural spraying operations over rice plantations in the La Yagua area of Valverde, Mao, Dominican Republic. After completing several spray passes, the pilot landed near an irrigation canal to inspect the functionality of the spraying system.
Upon landing, the pilot exited the aircraft but failed to shut down the engine or apply the collective friction. With the engine still running and the controls unsecured, the helicopter's aerodynamic forces caused it to lift off the ground in an uncontrolled manner. The aircraft subsequently drifted and crashed into a nearby irrigation canal, resulting in substantial damage to the airframe, including broken main rotor blades, a detached tail boom, and damaged skids.
The investigation
The CIAA investigation established that the pilot had not undergone any proficiency checks or recurrent training since November 2004. Furthermore, official records from the Dominican Institute of Civil Aviation (IDAC) indicated that the pilot had not received specific training related to the agricultural spraying operations being performed at the time of the accident. The investigation also noted difficulties in obtaining formal statements from the pilot and the operator regarding the event.
Findings
- The pilot failed to follow basic safety procedures by leaving the aircraft unattended with the engine running and the controls unsecured.
- The failure to apply collective friction and cut power was the primary cause of the uncontrolled takeoff.
- The pilot lacked recent proficiency training and specialized training for the specific type of agricultural operation being conducted.
- Weather conditions at the time of the accident were favorable, with calm winds and unlimited visibility.