NTSB Identification: CEN12LA491
14 CFR Part 137: Agricultural
Accident occurred Thursday, July 19, 2012 in Fergus Falls, MN
Probable Cause Approval Date: 08/13/2013
Aircraft: GRUMMAN G-164A, registration: N4638
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The pilot was spraying a large corn field when he saw a puff of white smoke come from the engine. He turned toward a road, but about half way through the turn, the engine lost all power. The pilot jettisoned the chemical load and landed in the corn field. Examination of the radial engine revealed the No. 2 cylinder head was cracked. A review of the maintenance logbooks revealed that a mandatory Federal Aviation Administration Airworthiness Directive that required a 100-hour visual inspection to prevent cylinder head cracking, had been complied with at the last annual inspection, but no entries were made that any cracks were observed.

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

A total loss of engine power due to a cracked No. 2 cylinder head.

Full narrative available

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