CEN20LA185 · Cessna 501
Cessna 501 · Accident: landing gear collapse
From Gainesville Regional Airport (GNV) to William P. Hobby Airport (HOU)
Event
- NTSB case
- CEN20LA185
- 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 501
- Aircraft type
- Cessna 501
- 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
- N501KM
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Gainesville Regional Airport (GNV), Gainesville, FLTo William P. Hobby Airport (HOU), Houston, TX
- Aircraft age
- About 41 years (built 1979)
- 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 · flare/touchdown
- 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
On final approach to his destination airport, the pilot lowered the landing gear for a full stop landing. He received two of three green landing gear down position indicator lights. The left main landing gear light was not illuminated, and a warning horn sounded. The pilot recycled the landing gear and received the same result. The pilot queried the tower and another airplane to confirm that his landing gear were extended, and both told the pilot that they saw all three gear extended. Consistent with airplane manufacturer guidance, the pilot then performed maneuvers to generate lateral G-force on the landing gear in an attempt to get a gear locked indication on the left main gear, which was not successful. Upon landing, the left main landing gear collapsed, and the airplane veered off the runway, resulting in substantial damage to the left wing and underbelly of the airplane.
Examination of the airplane’s landing gear system revealed the internal down lock mechanism of the left main landing gear actuator malfunctioned. The cockpit gear position indicator lights functioned normally. There were no recent logbook entries concerning anomalies with the left main landing gear.
Probable cause
The malfunction of the left main landing gear down lock, which resulted in a gear collapse upon landing.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN20LA185
- Event ID
- 20200520X14844
- Case number
- CEN20LA185
- 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: local date, investigation status, cause areas. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 2020-05-20.
- API snapshot SHA-256: 1ee0e109040f551f6a1487dec12d0709e270d2e8af7d3a11c00f0baaf511636c; retrieved 2026-09-16T11:39:38.600Z.