# NTSB CHI05LA220: Grumman G-164A, N9041M, New Boston, IL, August 7, 2005 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: August 6, 2005, 20:00 local (Aug 7, 2005, 01:00 UTC) - Place: New Boston, IL - Coordinates: 41.286945, -91.048614 - Nearby events: https://openairdocs.org/map.md?lat=41.2869&lon=-91.0486&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report August 29, 2006 - Report: Approved by Office Director - Parties: FAA-Springfield FSDO - NTSB case key (mKey): 62199 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI05LA220 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/62199/pdf - Page: https://openairdocs.org/ntsb/CHI05LA220 ## Probable cause The loss of engine power due to a cylinder failure and the unsuitable terrain encountered by the pilot during the forced landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, cruise - engine assembly,cylinder - failure (cause) - Forced landing, emergency descent/landing - In flight collision with terrain/water, emergency descent/landing - unsuitable terrain or takeoff/landing/taxi area - encountered, pilot in command (cause) - terrain condition - crop ## Analysis The agricultural spray airplane sustained substantial damage when it impacted the terrain after a loss of engine power during cruise flight. The pilot reported that he had finished spraying his last field for the day and was heading back to the airport when the engine lost power and oil pressure. Smoke began pouring into the cockpit. He reported that he was over a wooded area, but he managed to make a forced landing in a cornfield. The airplane impacted the terrain and skidded up on its nose. The inspection of the airplane revealed that one of the engine cylinders had failed. Aircraft records indicated that the 600 horsepower Pratt & Whitney R-1340-AN-2 engine had accumulated 1,026 hours since the last overhaul. The engine had accumulated 157 hours since the last annual inspection. ## Factual narrative On August 6, at 2005 central daylight time, a Grumman G-164A, N9041M, sustained substantial damage when it impacted the terrain near New Boston, Illinois, after a loss of engine power during cruise flight. The pilot received minor injuries. The Title 14 Code of Federal Regulations Part 137 aerial application flight departed Aledo, Illinois, at 1900 on a local flight. Visual meteorological conditions prevailed at the time of the accident. No flight plan was filed. The pilot reported that he had finished spraying his last field for the day and was heading back to the airport when he lost power and oil pressure. He reported that smoke was pouring into the cockpit. He reported that he was over a wooded area, but he managed to make a forced landing in a cornfield. The airplane impacted the terrain and skidded up on its nose. A Federal Aviation Administration airworthiness inspector examined the airplane. He reported that one of the engine cylinders had failed and a hole was visible on the side of the cylinder. Aircraft records indicated that the 600 horsepower Pratt & Whitney R-1340-AN-2 engine had accumulated 1,026 hours since the last overhaul. The engine had accumulated 157 hours since the last annual inspection conducted on January 20, 2005. ## Aircraft - Registration: [N9041M](https://openairdocs.org/aircraft/N9041M), registered now, S/N 1703 (OpenAirDocs) - Reported make and model: Grumman G-164A - Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs) - Category: Airplane - Serial number: 1703 - Airframe hours: 10409 - Engines: Pratt & Whitney 1340 AN-2 600 horsepower reciprocating - Damage: Destroyed - Fire: On-Ground - Flight: Positioning, Part 137 - Registered owner: Houston Ag Flying Service Inc. - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, January 1, 2005, 157 hours before - Departed: C00, ALEDO, IL ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; injuries: minor; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2; last flight review February 1, 2004; seat: center; flight hours: 11,800 total, 4,000 in this make and model, 11,800 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 0° at 0 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 81 °F, dew point 55 °F - Altimeter: 30.06 inHg - Observed at: BRL, 35 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20050806023869A](https://openairdocs.org/incident/20050806023869A), Aug 6, 2005: Scwzer G164A, New Boston, IL, Substantial damage. (-23) The pilot reported that he lost power in cruise flight after completing his spray operations. The aircraft was headed in an easterly direction and no… 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. --- 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.