# NTSB CHI05LA229: Grumman G-164A, N9632, Marshalltown, IA, August 12, 2005 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 12, 2005, 13:30 local (18:30 UTC) - Place: Marshalltown, IA - Coordinates: 42.112777, -92.917778 - Nearby events: https://openairdocs.org/map.md?lat=42.1128&lon=-92.9178&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report August 29, 2006 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 62636 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI05LA229 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/62636/pdf - Page: https://openairdocs.org/ntsb/CHI05LA229 ## Probable cause The loss of engine power for undetermined reasons during initial climb and the unsuitable landing area encountered by the pilot during a forced landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - initial climb - reason for occurrence undetermined (cause) - Forced landing, emergency landing - In flight collision with terrain/water, emergency landing - unsuitable terrain or takeoff/landing/taxi area - encountered, pilot in command (cause) - Nose over, emergency landing ## Analysis The agricultural airplane experienced a total loss of engine power following take off. The pilot then executed a forced landing on a soft and muddy corn field. Examination of the airplane revealed no anomalies. ## Factual narrative On August 12, 2005, at 1330 central daylight time, a Grumman G-164A, N9632, operated by Pro Air Service, Inc., as an aerial application airplane, received substantial damage on impact with terrain during a forced landing about two miles northwest of Marshalltown Municipal Airport (MIW), Marshalltown, Iowa. The pilot reported a loss of engine power. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 137 aerial application flight was not operating on a flight plan. The commercial pilot was uninjured. The local flight originated from MIW at 1315. The pilot stated that his preflight inspection of the airplane revealed no discrepancies. Following his preflight, he taxied to the chemical loading area to load the airplane with his first load of the day and then taxied to the fuel pumps to obtain 50 gallons of fuel. After refueling, he taxied to the run-up area where he performed a run-up which he described the engine and controls as "all operating properly." The pilot stated that he performed a "normal" take off and about one mile from the departure end of the runway, the engine began to lose power and the airspeed began to decrease. He nosed the airplane "slightly" down and added a little power to correct the problem; however, the engine continued to lose power. He applied maximum power, but the engine did not respond and continued to lose power. The airplane's altitude and airspeed were lower than he "cared for." He continued to fly the airplane straight ahead to avoid a stall and was certain that he could not keep the airplane in the air. He dumped the chemical on-board and "shortly thereafter" attempted to land on a soft and wet corn field in a three-point attitude. The airplane flipped over upon touchdown. Examination of the airplane by the Federal Aviation Administration revealed that all airplane control surfaces and their connections throughout the airplane were intact. All of the engine cylinders were intact with no visible cracks or other damage noted. The engine was attached to the airframe and was rotated through the crankshaft; no anomalies were reported. A copy of a refueling invoice from the departure airport's fixed base operator lists 53.5 gallons of fuel was pumped into the airplane prior to the accident takeoff. ## Aircraft - Registration: [N9632](https://openairdocs.org/aircraft/N9632), registered now, S/N 1196, built 1974 (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) - Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 1196 - Engines: Pratt & Whitney R-1340 reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Registered owner: Pro Air Service, Inc. - Airworthiness certificate: Special, Restricted (Special) - Departed: MIW, MARSHALLTOWN, IA - Destination: MIW - Airport: MIW, Marshalltown Municipal ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 25; injuries: none; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2; last flight review March 1, 2005; seat: center; flight hours: 1,915 total, 405 in this make and model, 1,857 as pilot in command, 400 in the last 90 days, 175 in the last 30 days, 11 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 350° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 72 °F, dew point 68 °F - Altimeter: 29.96 inHg - Observed at: MIW, 2 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 20050812018549A](https://openairdocs.org/incident/20050812018549A), Aug 12, 2005: Scwzer G164A, Marshalltown, IA, Substantial damage. (-23) Pilot reported engine not developing full power just after takeoff from the Marshalltown Municipal Airport on Friday, August 12, 2005. Pilot pushed the… ## Other investigations on N9632 (2) 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 CHI98LA230](https://openairdocs.org/ntsb/CHI98LA230), May 21, 1998: Grumman G-164A (N9632), Red Lake Falls, MN, substantial damage. Probable cause: a locked brake for undetermined reasons. - [NTSB FTW76DPG04](https://openairdocs.org/ntsb/FTW76DPG04), Jul 11, 1975: Grumman G-164A (N9632), Cotton Plant, AR, substantial damage 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.