Grumman G-164A accident near Marshalltown, Iowa, August 12, 2005
On August 12, 2005 at about 6:30 pm local time, a Grumman G-164A, registered N9632, was substantially damaged in an accident near Marshalltown, Iowa (Marshalltown Municipal airport). It was an aerial application (crop spraying) flight under agricultural flying rules (Part 137). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
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The NTSB's probable cause their words, unchanged
The loss of engine power for undetermined reasons during initial climb and the unsuitable landing area encountered by the pilot during a forced landing.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 12, 2005 · about 6:30 pm local time
- Place
- Marshalltown, Iowa · Marshalltown Municipal · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman G-164A · all G-164As on the register
- Registration
- N9632 · registry record · serial 1196
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
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.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: commercial pilot
- Ratings: single-engine land; instrument: airplane
- Flight time: 1,915 hours in all; 405 in this make and model; 400 in the last 90 days; 175 in the last 30 days; 1,857 as pilot in command; 0 on instruments
- Last flight review: March 1, 2005
- Medical certificate: Class 2
- Seat: ctr
- Injury: no injuries
The aircraft
- Seats: 1
- Landing gear: fixed
- Engine: Pratt & Whitney R-1340 (piston); 0 hours total
The flight
- Departed from: MIW Marshalltown IA at 6:15 pm
- Destination: MIW
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 350° at 6 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 72°F (22°C), dew point 68°F (20°C)
- Altimeter: 29.96 inHg
- Observation at 5:53 pm from MIW, 2 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Other NTSB records under N9632 the same tail number, which may have belonged to a different aircraft at the time
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The documents and photographs are the NTSB's docket, the folder of records gathered during the investigation, shown as the NTSB released them (the NTSB redacts some personal details first) and listed under the NTSB's own titles. This site's own text never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number CHI05LA229.