FTW97LA216 · Wsk Pzl Mielec M-18
Wsk Pzl Mielec M-18 · Accident: gear collapsed during takeoff
From No airport to an unrecorded destination
Event
- NTSB case
- FTW97LA216
- 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
- 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
Wsk Pzl Mielec M-18
- Aircraft type
- WSK PZL Mielec M-18
- 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
- N6220C
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From No airportTo not recorded
- 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 137: Agricultural
- 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 · roll/run
- 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
- Gear collapsed
- 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
- Miscellaneous, bolt/nut/fastener/clamp/spring › Failure
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
During takeoff, after the tail wheel came up and before attaining flying speed, the right main landing gear collapsed. Subsequently, the right wheel assembly castored about 90 degrees, causing the aircraft to veer off the side of the runway, and travel about 100 yards through a plowed field. Just prior to coming to rest, the aircraft rolled inverted and a post impact fire consumed the engine compartment and hopper area. Examination of the right main landing gear assembly revealed that the right main landing gear torque link assembly attaching bolt failed. The external surface of the bolt was corroded, and the fracture surface showed evidence of overload failure. There was no evidence of lubrication residues on the bolt and adjacent torque link assembly. According to the aircraft's maintenance manual, the main landing gear torque link assembly attaching bolt should be lubricated every 50 hours. Examination of the maintenance records, did not show any entries made regarding the lubrication of the aforementioned items.
Probable cause
Main landing gear collapse resulting from a failure of the torque link assembly attaching bolt. A factor was the lack of required maintenance (lubrication of the bolt) which resulted in the bolt becoming dry and corroded.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record FTW97LA216
- Event ID
- 20001208X08118
- Case number
- FTW97LA216
- 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: dc89b8f47adc97c556c8f5b12b5c4b370cb741f6d81746952f841d6f3dc33ae9; retrieved 2026-09-21T21:25:33.522Z.