ERA09CA006 · Beech F17D
Beech F17D · Accident: landing gear collapse
From Hawks Nest Airport (4TN3) to Hawks Nest Airport (4TN3)
Event
- NTSB case
- ERA09CA006
- 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
Beech F17D
- Aircraft type
- Beechcraft 17
- 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
- N18555
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Hawks Nest Airport (4TN3), Moscow, TNTo Hawks Nest Airport (4TN3), Moscow, TN
- 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
- Landing · landing roll
- 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
- Landing gear collapse
- 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
- Aircraft › Aircraft systems
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
According to the pilot/owner of the Beech F17D Staggerwing biplane, on the day of the accident, he took a passenger on a brief local flight, and then they returned for some landings and takeoffs. The winds were calm, and the first landing was uneventful. The pilot took off again, circuited the traffic pattern, and landed a second time. Shortly after touchdown, the airplane began to "sink." The pilot tried to raise the nose to offload the landing gear, and he shut down the engine, while the airplane continued to settle. The propeller struck the ground, and the airplane settled on the right lower wing before it came to a stop. The aft fuselage, propeller, lower cowl and outboard spar of the right lower wing were damaged. Postaccident examination indicated that the chain used to retract and extend the right main landing gear had fractured, which resulted in the partial retraction of the landing gear. According to maintenance records, the chain was installed new in the airplane in 1969, and it had accumulated approximately 910 hours in service. The pilot/owner estimated that the chain had accumulated 1,800 cycles, with each cycle consisting of one retraction and one extension. Visual examination revealed 29 fractures in the outer chain plates, and two completely fractured outer plates, not including the chain failure point. All fractures were oriented radially with respect to the link pivots. Every outer plate was stamped with the notation "ACME 40 SINGAPORE." The National Transportation Safety Board was unable to determine whether this failure mode was limited to this make and model chain. The airplane was manufactured in 1937, and the manufacturer had not established any time or cycle life limits for the chain.
Probable cause
The mechanical failure of the landing gear actuation chain.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA09CA006
- Event ID
- 20081007X71414
- Case number
- ERA09CA006
- 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. 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: 2e277766a514304128d0cf1c6c48e2d328d92d4063f65b7d9525c92684e6d6a2; retrieved 2026-09-15T10:25:43.757Z.