American Airlines Flight 3646
Embraer 140 LR · Accident: clear air turbulence encounter en route
From Springfield Branson National Airport (SGF) to Dallas Fort Worth International Airport (DFW)
Narrative check · The NTSB narrative appears to contradict this record's location. Values are shown as recorded, not corrected; compare with the narrative.
Event
- NTSB case
- DCA08FA064
- 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
- Airline
- 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
Embraer 140 LR
- Aircraft type
- Embraer 140
- 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
- N816AE
- Operator
- American Airlines
- Onboard fatalities
- Unknown
- Route
- From Springfield Branson National Airport (SGF), Springfield, MOTo Dallas Fort Worth International Airport (DFW), Arlington, TX
- Aircraft age
- Not recorded
- 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 121: Air Carrier
- 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
- En route · cruise
- 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
- Clear air turbulence encounter
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- None
Cause areas
- Environmental issues › Conditions/weather/phenomena
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
According to the flight crew the flight was carried out in smooth air for most of the way to Dallas. When the flight reached a point about 40 nm west of Bowie VOR, at 17,000 feet altitude, and as the airplane overflew a small cloud, the airplane was abruptly jolted by turbulence. The autopilot disconnected and was immediately reactivated by the flight crew. During the turbulence encounter, an elderly female passenger fell to the floor near the lavatory and suffered a broken ankle.
Probable cause
The flight's inadvertent encounter with turbulence.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DCA08FA064
- Event ID
- 20081003X16303
- Case number
- DCA08FA064
- 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, damage. 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: 3801ddb12d27737f7fdac51b6a02ca515f059db06d4be43bca788c82deeb45d2; retrieved 2026-09-15T10:16:27.458Z.