# Accident 20230722008889A: Grumman G-164A, Potoka, IL, July 22, 2023 - Type: FAA accident report (Accident/Incident Data System), as reported - Date: July 22, 2023, 11:13 local time - Place: Potoka, IL - Damage: Destroyed - Phase of flight: Maneuver - Operating rules: Agricultural (Part 137) - Operator: ZNUG - Location: 38.4070° N, 87.5856° W: From the FAA - Nearby events: https://openairdocs.org/map.md?lat=38.4070&lon=-87.5856&mi=10 - Aircraft: N9892, registered now (https://openairdocs.org/aircraft/N9892) (OpenAirDocs) - Registry model: Grumman G-164A (registry code 3952704, https://openairdocs.org/model/grumman-g-164a) (OpenAirDocs) - Registry engine: Pratt & Whitney PT6A series (registry code 52034, https://openairdocs.org/engine/pratt-whitney-pt6a-series) (OpenAirDocs) - Reported make and model: GRUMMAN G-164A - Reported engine: P&W PT6A SERIES - People aboard: 1 - Fatal injuries: 0 - Other injuries: 0 - Pilot certificates: Commercial pilot - Pilot flight hours: 1,644 total - NTSB investigation: [NTSB CEN23LA317](https://openairdocs.org/ntsb/CEN23LA317) (OpenAirDocs) - FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/) - Page: https://openairdocs.org/incident/20230722008889A ## Narrative As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^. THE AIRCRAFT ACCIDENT LOCATION IS 1.75 MILES SOUTHEAST OF POTOKA, IL. LAT. 38.43.58 N LONG. 89.04.26 W. PILOT REPORTED THAT HE FUELED AT SALEM LOCKRONE AIRPORT KSLO APPROXIMATELY 8.6 MILES SOUTHEAST OF THE ACCIDENT. THE PILOT REPORTED THAT HE FUELED FROM A COMPANY OWNED FUEL TANK ON THE AIRPORT. A FUEL SAMPLE WAS TAKEN FROM THE FUEL FILTER ASSEMBLY ON THE COMPANY OWNED FUEL TANK. NO VISUAL ABNORMALITIES NOTED. THE PILOT REPORTED THAT ON THE THIRD OR FOURTH PASS ON THE FIELD THE ENGINE QUIT SUDDENLY. NO UNSUAL NOISE WAS NOTED. PILOT IMMEDIATELY MADE AN EMERGENCY LANDING IN THE CORN FIELD LANDING IN A SOUTHERNLY DIRECTION. UPON IMPACT THE AIRCRAFT DESTROYED APPROXIMATEY FIFTY YARDS OF CORN AND CAME TO REST APPROXIMATELY 25 YARDS FROM A METAL BUILDING. THE IMPACT CAUSED THE AIRCRAFT TO SPIN ON THE GROUND APPROXIMATELY 180 DEGREES RESTING AT AN ANGLE FACING NORTH. THE AIRCRAFT SUSTAINED SUBSTATIAL DAMAGE. NO STUCTURAL DAMADE WAS NOTED TO THE METAL BUILDING. THE ENGINE AND ENGINE NACELLE WERE SEPERATED UPON IMPACT. CONTINUITY WAS ESTABLISHED FOR FLIGHT CONTROLS AND ENGINE CONTROLS AS PRACTICAL DUE TO THE ENGINE ASSEMBLY BEING SEPERATED FROM THE FUSELAGE. A LARGE NUMBER OF POWER TURBINE BLADES HAD BROKEN OFF DURING THE FLIGHT. UPON RESEARCHING THE ENGINE LOGBOOKS IT WAS DISCOVERED THAT THE ENGINE HAD A TOTAL TIME OF 14,092 HOURS, A TIME SINCE OVERHAUL OF 6738 HOURS, AND A TIME SINCE HOT SECTION INSPECTION OF 1218 HOURS. ONE AIRFRAME AND TWO ENGINE LOGBOOKS WERE SHIPPED TO THE SPRINGFIELD FSDO FROM THE AIRCRAFT OWNER. THE ENGINE LOGBOOKS WERE NOT COMPLETE TO SHOW THE ENTIRE HISTORY OF THE ENGINE. THE EARLIEST ENTRY IN THE ENGINE LOGBOOK IS 03/26/1986 ENGINE TOTAL TIME 8748 HOURS AND A TIME SINCE OVERHAUL OF 1412 HOURS. REVIEWING LOGBOOK ENTRIES SINCE LAST HOT SECTION INSPECTION IT COULD NOT BE DETERMINED IF RECOMMENDED ENGINE WASHES WERE CONDUCTED. THE POWER TURBINE BLADES HAVE LARGE AREAS ON EACH BLADE THAT EXHIBIT SULFIDATION. ENGINE TOTAL START CYCLES WERE NOT PROVIDED NOR WERE THEY ABLE TO BE DETERMINED. ## The NTSB's investigation of this event (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CEN23LA317](https://openairdocs.org/ntsb/CEN23LA317), Jul 22, 2023: Grumman G-164A (N9892), Patoka, IL, substantial damage. Probable cause: A partial loss of engine power due to the failure of two compressor turbine blades as a result of the engine operating near or above the engine’s operating limits for an undetermined amount of time… ## Other reports on N9892 (1) Matched to the same aircraft by N-number and date. - [Accident 20080728843599A](https://openairdocs.org/incident/20080728843599A), Jul 28, 2008: Scwzer G164A (N9892), Veedersburg, IN, Substantial damage. (-23) The aircraft was being operated FAR part 137, aerial application, when the pilot experienced a fluctuation in the engine torque. The engine performance… From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.