Boeing A75N1 and Boeing B75N1 accident near Mundelein, Illinois, June 16, 1991
On June 16, 1991 at about 11:30 pm local time, 2 aircraft, Boeing A75N1 (N59791) and Boeing B75N1 (N4408N), were involved in the same accident near Mundelein, Illinois (Air Estates airport). No one was hurt; 4 people were on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
THE PILOT-IN-COMMAND'S NOT MAINTAINING VISUAL CONTACT WITH THE PREVIOUSLY IDENTIFIED AIRPLANE.
THE PILOT IN COMMAND'S NOT MAINTAINING VISUAL CONTACT WITH THE PREVIOUSLY IDENTIFIED AIRPLANE.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 16, 1991 · about 11:30 pm local time
- Place
- Mundelein, Illinois · Air Estates · map
- Type
- Accident · collision on the ground
- Injuries
- No one was hurt; 4 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft 1
- Boeing A75N1 · all A75N1s on the register
- Registration
- N59791 · registry record · serial 75-3547
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
- Aircraft 2
- Boeing B75N1 · all B75N1s on the register
- Registration
- N4408N · registry record · serial 75-7689
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative for the Boeing A75N1 final · quoted from the NTSB record
PILOTS OPERATING AT A PRIVATELY OWNED AIRPORT AGREED TO TAKEOFF SOUTH AND LAND NORTH DUE TO REPEATED COMPLAINTS OF A HOMEOWNER WHOSE HOUSE IS LOCATED 120 FEET FROM THE SOUTH RUNWAY'S THRESHOLD. THE PILOT OF AN ANTIQUE BIPLANE WAS PERFORMING HIS PRE-TAKEOFF CHECK WHEN HE OBSERVED AN AIRPLANE SIMILAR TO HIS ON DOWNWIND FOR THE RUNWAY OPPOSITE HIS INTENDED TAKEOFF RUNWAY. THE PILOT STATED HE LOOKED AGAIN FOR THE FLYING AIRPLANE AND DID NOT SEE HIM. HE PROCEEDED WITH THE TAKEOFF ROLL. APPROXIMATELY HALFWAY DOWN THE RUNWAY, THE AIRPLANE COLLIDED WITH THE PREVIOUSLY OBSERVED AIRPLANE.
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 NTSB's narrative for the Boeing B75N1 final · quoted from the NTSB record
PILOTS OPERATING AT A PRIVATELY OWNED AIRPORT AGREED TO TAKEOFF SOUTH AND LAND NORTH DUE TO REPEATED COMPLAINTS OF A HOMEOWNER WHOSE HOUSE IS LOCATED 120 FEET FROM THE SOUTH RUNWAY'S THRESHOLD. THE PILOT OF AN ANTIQUE BIPLANE HAD ENTERED A DOWNWIND LEG FOR THE NORTH RUNWAY AND OBSERVED AN AIRPLANE SIMILAR TO HIS PREPARING FOR, WHAT HE BELIEVED WAS, A SOUTH TAKEOFF. THE PILOT STATED HE THEN OBSERVED THE AIRPLANE TAXI OFF ONTO A PARKING AREA AND THOUGHT THAT THE OTHER AIRPLANE SAW HIM AND CLEARED THE RUNWAY FOR HIS LANDING. THE PILOT CONTINUED WITH THE LANDING APPROACH. SHORTLY AFTER TOUHDOWN THE AIRPLANE COLLIDED WITH THE OTHER AIRPLANE PREVIOUSLY OBSERVED.
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 for the Boeing A75N1 from the NTSB's investigation tables, in plain English
Pilot
- Certificate: commercial pilot
- Ratings: multi-engine land; single-engine land
- Flight time: 872 hours in all; 372 in this make and model
- Medical certificate: Class 2
- Seat: unk
The aircraft
- Last inspection: inspection type not recorded; 0 hours since
- Maximum gross weight: 2,950 lb
- Seats: 2
- Landing gear: fixed
- Engine: Continental W670-6A (piston); 0 hours total
The flight
- Flight plan: none
- Runway 18, 2,000 ft by 100 ft
Weather at the time
- Light: daylight
- Wind: from 060° at 10 knots
- Visibility: 45 statute miles
- Sky: broken clouds at 25,000 ft; scat at 10,000 ft
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
- Observation at 10:47 pm from UGN, 13 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 1 |
The factual record for the Boeing B75N1 from the NTSB's investigation tables, in plain English
Pilot
- Certificate: private
- Ratings: single-engine land; instrument: airplane
- Flight time: 2,017 hours in all; 911 in this make and model
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: unk
The aircraft
- Last inspection: inspection type not recorded; 0 hours since
- Maximum gross weight: 2,950 lb
- Seats: 2
- Landing gear: fixed
- Engine: Lycoming R-680-E3B (piston); 0 hours total
The flight
- Flight plan: none
- Runway 36, 2,000 ft by 100 ft
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 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.