Lake LA-4 accident near Algonac, Michigan, August 23, 2008
On August 23, 2008 at about 6:15 pm local time, a Lake LA-4, registered N1147L, was substantially damaged in an accident during taxi near Algonac, Michigan (Coleman A Young Muni airport). It was a personal flight 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 amphibious airplane's collision with submerged debris during taxi for takeoff, and the resulting damage to the hull.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 23, 2008 · about 6:15 pm local time
- Place
- Algonac, Michigan · Coleman A Young Muni · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Lake LA-4 · all LA-4s on the register
- Registration
- N1147L · registry record · serial 309
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot reported that after departure he proceeded to a nearby lake in order to practice water takeoffs and landings. After landing, the water conditions became too rough to safely takeoff. The pilot elected to water taxi to a bay area near an island for smoother conditions. He stated that as he crossed near the southern tip of the island, the airplane struck a submerged object. He estimated the airplane's speed at the time as approximately 6 miles per hour. He steered the airplane toward deeper water; however, after about 3 minutes his feet were under water. He subsequently taxied into water about 3 feet deep and came to rest with the landing gear down. He noted that the airplane normally sat about 18 inches deep in the water. The depth finder did not alert him to the presence of the submerged object prior to the collision.
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
- Ground collision during taxi defining event
The NTSB's findings
- cause Aircraft › Aircraft structures › Fuselage › Plates/skins (aux fuselage) › Damaged/degraded
- cause Environmental issues › Physical environment › Object/animal/substance › Hidden/submerged object › Effect on equipment
Pilot
- Certificate: private
- Ratings: single-engine land; single-engine sea
- Flight time: 348 hours in all; 102 in this make and model; 1 in the last 90 days; 1 in the last 30 days
- Medical certificate: Class 3 (with waivers/limitations)
- Seat: left
- Injury: no injuries
The aircraft
- Airframe total time: 2,452 hours
- Last inspection: annual inspection, August 22, 2008
- Maximum gross weight: 2,400 lb
- Seats: 4
- Landing gear: fixed
- Engine: Lycoming O&VO-360 SER (piston); 0 hours total
The flight
- Departed from: DET Detroit MI at 5:30 pm
- Destination: Algonac MI
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 170° at 9 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
- Observation at 5:00 pm from DET, 15 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.
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.