ANC10LA026 · Cessna 170B
Cessna 170B · Accident: aircraft structural failure while taxiing
From Lake Hood Seaplane Base (LHD) to Lake Hood Seaplane Base (LHD)
Event
- NTSB case
- ANC10LA026
- 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
Cessna 170B
- Aircraft type
- Cessna 170
- 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
- N3492C
- Operator
- Piscoya Thomas G
- Onboard fatalities
- Unknown
- Route
- From Lake Hood Seaplane Base (LHD), Anchorage, AKTo Lake Hood Seaplane Base (LHD), Anchorage, AK
- 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
- Taxi · to runway
- 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
- Aircraft structural failure
- 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 from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The airline transport pilot was on a personal flight in a ski-equipped airplane. The pilot said that he was taxiing for takeoff when the right main landing gear leg broke near where the leg exits the fuselage. When the leg broke the right wing impacted the ground, bending the wing from the aileron outward toward the tip. An examination of the break showed a single linear break perpendicular to the leading edge of the gear leg. The break was about 6 inches from the gear leg mounting bolt hole, at the widest portion of the gear leg. The gear leg was retained for metallurgical examination by the Federal Aviation Administration.
Probable cause
The structural failure of the right main landing gear leg, resulting in the collapse of the landing gear.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ANC10LA026
- Event ID
- 20100318X45409
- Case number
- ANC10LA026
- 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: 4653bcfa4c8686a068ee08a75abf09802aa84b4b7dee08cf52fafa9ff9405cbc; retrieved 2026-09-15T13:45:33.495Z.