# NTSB CHI91LA194: Boeing A75N1, N59791, Mundelein, IL, June 16, 1991 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 16, 1991, 18:30 local (23:30 UTC) - Place: Mundelein, IL - Coordinates: 42.259925, -87.99945 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.2599&lon=-87.9994&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 4 uninjured - Status: Completed, report March 24, 1993 - Report: Approved by Office Director - NTSB case key (mKey): 15099 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91LA194 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15099/pdf - Page: https://openairdocs.org/ntsb/CHI91LA194 ## Probable cause (aircraft 2) THE PILOT IN COMMAND'S NOT MAINTAINING VISUAL CONTACT WITH THE PREVIOUSLY IDENTIFIED AIRPLANE. ## Probable cause (aircraft 1) THE PILOT-IN-COMMAND'S NOT MAINTAINING VISUAL CONTACT WITH THE PREVIOUSLY IDENTIFIED AIRPLANE. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water collision with object, takeoff - roll/run - object - aircraft moving on ground - visual lookout - inadequate, pilot in command (cause) - visual lookout - inadequate, pilot of other aircraft (cause) - On ground/water collision with object, landing - roll - object - aircraft moving on ground - visual lookout - inadequate, pilot in command (cause) - visual lookout - inadequate, pilot of other aircraft (cause) ## Analysis (aircraft 2) 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. ## Analysis (aircraft 1) 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. ## Aircraft 1 - Registration: [N59791](https://openairdocs.org/aircraft/N59791), registered now, S/N 75-3547, built 1942 (OpenAirDocs) - Reported make and model: BOEING A75N1 - Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs) - Registry engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 75-3547 - Engines: CONTINENTAL W670-6A 220 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Ronald R. Nystrom - Registered owner: Ronald R. Nystrom - Airport: LL09, Air Estates, runway 18, 2,000 × 100 ft, grass/turf ## Aircraft 2 - Registration: [N4408N](https://openairdocs.org/aircraft/N4408N), registered now, S/N 75-7689, built 1943 (OpenAirDocs) - Reported make and model: BOEING B75N1 - Registry model: [Boeing B75N1](https://openairdocs.org/model/boeing-b75n1) (registry code 1380144) (OpenAirDocs) - Registry engine: [Lycoming R680](https://openairdocs.org/engine/lycoming-r680) (registry code 41540, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 75-7689 - Engines: LYCOMING R-680-E3B 300 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Claude Sonday - Registered owner: Terrance P. Sonday - Airport: LL09, Air Estates, runway 36, 2,000 × 100 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot, aircraft N59791; age 47; commercial; airplane ratings: single-engine land, multi-engine land; medical: class 2, unknown; flight hours: 872 total, 372 in this make and model - Pilot, aircraft N4408N; age 44; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 2,017 total, 911 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 60° at 10 knots - Visibility: 45 statute miles - Lowest ceiling: 25,000 ft broken - Temperature: -0 °F, dew point -0 °F - Observed at: UGN, 13 nm away ## FAA reports on this event (2) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19910616022061A](https://openairdocs.org/incident/19910616022061A), Jun 16, 1991: Boeing A75N1, Mundelein, IL, Substantial damage. On downwind takeoff roll collided with N4408N on its landing roll in opposite direction. Did not use radio. - [Accident 19910616022062A](https://openairdocs.org/incident/19910616022062A), Jun 16, 1991: Boeing A75N1, Mundelein, IL, Substantial damage. On landing roll collided wiht N59791 that was taking off downwind in opposite direction. Did not use radio. From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.