FTW99LA086 · Keil JAEGER D-IX JAEGER D-I
Keil JAEGER D-IX JAEGER D-I · Accident: airframe, component or system failure
From 37R · Hitchcock, TX to UNKNOWN
Event
- NTSB case
- FTW99LA086
- 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
- 1 · all aircraft and ground
- Ground fatalities
- 0
- 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
Keil JAEGER D-IX JAEGER D-I
- Aircraft type
- Keil JAEGER D-IX
- 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
- N257JK
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From 37R · Hitchcock, TXTo UNKNOWN
- 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 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
- Unknown
- First occurrenceThe 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
- Airframe, component or system failure
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Destroyed
Cause areas
- Flight control, aileron › Separation
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The amateur-built experimental biplane impacted the ground in a vertical attitude following the in flight separation of the right upper and lower wings. The right wings came to rest about 275 yards from the main wreckage. The right upper aileron separated from the right upper wing and came to rest about 65 feet from the right wings. Examination of the three fractured rod ends, which were used to attach the aileron to the wing, indicated that the rod ends failed as a result of overload. The right lower aileron remained attached to the right lower wing. The rod that connected the right upper and lower ailerons was not recovered; however, pieces of the rod remained bolted to each aileron. Visual examination of the fracture surfaces on the rod pieces revealed no evidence of fatigue cracking. The top and bottom aileron cables for the right upper aileron were separated, and the separated ends displayed a 'horsetail' appearance, indicative of overload failure. No evidence of contact between the aileron leading edges and the wing trailing edges was noted. The reason for the separation of the right upper aileron could not be determined.
Probable cause
The separation of the right upper aileron for an undetermined reason.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record FTW99LA086
- Event ID
- 20001205X00169
- Case number
- FTW99LA086
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
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. 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: 5ec9c4d3b3ee4c690465ab5ce4938748c74f8f14459140bb943c0f48300947b8; retrieved 2026-09-20T22:13:49.960Z.