GAA15CA163 · Gates Learjet CORP. 35A
Beta Aire Gates Learjet CORP. 35A · Accident: wildlife encounter (non-bird) during takeoff
From Grosse Ile Municipal Airport (ONZ) to Chicago Midway International Airport (MDW)
Event
- NTSB case
- GAA15CA163
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Gates Learjet CORP. 35A
- Aircraft type
- Learjet 35
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N640BA
- Operator
- Beta Aire
- Onboard fatalities
- Unknown
- Route
- From Grosse Ile Municipal Airport (ONZ), Grosse Ile, MITo Chicago Midway International Airport (MDW), Chicago, IL
- Aircraft age
- About 24 years (built 1991)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Takeoff
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Wildlife encounter (non-bird)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Environmental issues › Physical environment
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot reported that during the takeoff roll, while accelerating through 130 knots, a "faint bump" was felt. The flight crew continued the takeoff and experienced difficulty controlling the airplane, but were able to stabilize the airplane in flight. The flight crew reported that there were no annunciations or warnings on the flight deck, but they were able to identify damage to the leading edge of the right wing.
The flight crew diverted to an alternate airport and landed without incident. The airplane sustained substantial damage to the right wing.
Following the accident, a deer was found on the runway at the departure airport. The departure airport perimeter is partially fenced and co-exists on an island with a nature conservancy.
The pilot reported no mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation prior to hitting the deer.
Probable cause
The airplane's collision with a deer on the unfenced runway during the takeoff roll. Contributing to the accident is the airport's failure to establish a continuous fence between the runway and the nature conservancy.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record GAA15CA163
- Event ID
- 20150707X73857
- Case number
- GAA15CA163
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status, coordinates. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: f44680612bb234d0b977185b14c5c97a2dec9ea44aecf5d2e5e668ef70cff22d; retrieved 2026-09-16T02:30:16.111Z.