Texas Helicopter CORP OH 13H/M74A accident near Minonk, Illinois, July 25, 2016
On July 25, 2016 at about 3:50 pm local time, a 1979 Texas Helicopter CORP OH 13H/M74A, registered N10009, was substantially damaged in an accident during standing (engine(s) operating) near Minonk, Illinois. 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).
The NTSB's probable cause their words, unchanged
Failure of the truck driver to ensure that he had adequate clearance to pass under the helicopter and the failure of the loader to park in a safer area for reloading operations.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 25, 2016 · about 3:50 pm local time
- Place
- Minonk, Illinois · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Texas Helicopter CORP OH 13H/M74A, built 1979 · all OH 13H/M74As on the register
- Registration
- N10009 · registry record · serial 79-032
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
During reloading operations for an agricultural flight, the nurse truck was parked on the right shoulder of a road, facing west. The helicopter was parked on the elevated helipad on top of the nurse truck, facing north, with the engine running and rotor blades turning. The helicopter's tail boom and rotor disk extended about 8-10 ft over the road. As the loader was reloading the helicopter's product tanks, a westbound semi-trailer truck drove underneath the rotor disk and struck the helicopter's tail boom. The semi-trailer truck driver said he thought he had enough clearance to pass safely under the helicopter's tail rotor. The pilot said that if the nurse truck had parked closer to an adjoining field, the platform would have a tilt, making it difficult to land for servicing. It is likely that the semi-trailer truck driver failed to ensure that he had adequate clearance to pass under the helicopter and that the loader failed to park in a safer area for the reloading operations.
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
What happened, in order
- Aircraft loading event during standing (engine(s) operating)
- Ground collision during standing (engine(s) operating) defining event
The NTSB's findings
- cause Personnel issues › Task performance › Planning/preparation › (general) › Ground crew
- cause Personnel issues › Task performance › (general) › (general) › Other/unknown
The aircraft
- Maximum gross weight: 2,450 lb
- Seats: 1
- Landing gear: fixed
- Engine: Lycoming VO-435 A1F (piston); 0 hours total
- Operator: Hendrickson Flying Service INC
The flight
- Departed from: NONE Minook IL
- Destination: NONE Minook IL
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 330° at 4 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 79°F (26°C), dew point 73°F (23°C)
- Altimeter: 30.02 inHg
- Observation at 3:55 pm from KPNT, 17 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight 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 N10009 the same tail number, which may have belonged to a different aircraft at the time
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.