NTSB Identification: MIA05CA144.
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Accident occurred Thursday, August 04, 2005 in Sabana Grande, PR
Probable Cause Approval Date: 10/27/2005
Aircraft: Grumman American G-164, registration: N460Y
Injuries: 1 Minor.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot stated that he departed from the Lajas Agriculture Airport at about 7 am in his Grumman G-164 with a northeast heading. On board the airplane was a load of mircoflex fertilizer, which was to be sprayed on a private farm in Sabana Grande. His first swift run over the farm was successful but as he begun his first procedure turn, he experienced a strong downdraft on the leeward side of the mountain. Unable to recover from the downdraft, the airplane lost altitude and crashed into a backyard of a private home. Neither he nor anyone on the ground was hurt and the private home sustained little damage. He further added the weather was for a visual flight rules operation; with the winds from the north and the temperature was 30 degrees Celsius. The pilot stated there were no mechanical failures or malfunctions to the airplane or any of its systems prior to the accident.The FAA inspector who responded to the accident stated the airplane impacted the ground straight down in a flat attitude and with no forward direction.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's inadvertent encounter with a downdraft in mountainous terrain resulting in an uncontrolled descent and collision with the terrain.

Full narrative available

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