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Accidents · NTSB CEN11LA618 · Final report

Amateur-built Waiex accident near Marion, Illinois, September 2, 2011

On September 2, 2011 at about 2:28 pm local time, a amateur-built Waiex, registered N100VY, was substantially damaged in an accident during initial climb near Marion, Illinois (Williamson County Regional airport). It was a flight test under general aviation rules (Part 91). 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

The partial loss of engine power during initial climb for undetermined reasons.

Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.

What the record shows

Date
September 2, 2011 · about 2:28 pm local time
Place
Marion, Illinois · Williamson County Regional · map
Type
Accident
Injuries
No one was hurt; 1 person was on board or involved.
Weather
visual conditions (good weather)
Aircraft
Amateur-built Waiex
Registration
N100VY · registry record · serial W0100
Damage
Substantial damage
Flight
Flight test · general aviation rules (Part 91)

The NTSB's narrative final · quoted from the NTSB record

The accident occurred during initial flight testing of the experimental amateur-built airplane. The pilot reported that there were no anomalies with the engine during a before-takeoff engine check or when he applied power for takeoff. He stated that shortly after liftoff he perceived that the engine was not producing maximum takeoff power and that the engine tachometer was indicating several hundred rpm lower than expected. Since there was insufficient runway remaining to land safely, he elected to land on the airport's crossing runway. The left wingtip collided with terrain as he maneuvered the airplane toward the crossing runway. A postaccident examination of the airplane did not reveal any mechanical malfunctions or failures that would have precluded normal operation of the airplane. Additionally, the accident engine demonstrated the ability to produce rated horsepower during a postaccident operational test run. Although the potential for serious carburetor icing existed while operating at glide power, the postaccident investigation was unable to conclusively determine if carburetor icing had contributed to the partial loss of engine power.

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

  1. Loss of engine power (partial) during initial climb defining event
  2. Off-field or emergency landing during landing
  3. Dragged wing/rotor/float/other during landing

The NTSB's findings

  • cause Aircraft › Aircraft power plant › Engine (reciprocating) › (general) › Malfunction
  • cause Not determined › Not determined › (general) › (general) › Unknown/Not determined

Pilot

  • Certificate: private
  • Ratings: single-engine land; instrument: airplane
  • Flight time: 615 hours in all; 5 in this make and model; 5 in the last 90 days; 5 in the last 30 days; 448 as pilot in command; 0 on instruments
  • Last flight review: April 10, 2010
  • Medical certificate: Sport Pilot
  • Seat: left
  • Injury: no injuries

The aircraft

  • Airframe total time: 5 hours
  • Last inspection: condition inspection, June 20, 2011
  • Maximum gross weight: 1,250 lb
  • Seats: 2
  • Landing gear: fixed
  • Engine: Jabiru 3300-A (piston); 0 hours total

The flight

  • Departed from: KMWA Marion IL at 2:28 pm
  • Destination: KMWA Marion IL
  • Flight plan: none
  • Runway 20, 8,002 ft by 150 ft

Weather at the time

  • Light: daylight
  • Wind: from 190° at 6 knots
  • Visibility: 15 statute miles
  • Sky: clear
  • Temperature: 88°F (31°C), dew point 64°F (18°C)
  • Altimeter: 30.04 inHg
  • Observation at 2:32 pm from KMWA

Injuries

FatalSeriousMinorNone
Flight crew1

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.

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.