CHI00LA010 · Cessna 172G
Cessna 172G · Accident: gear collapsed during landing
From Anoka County-Blaine (Janes Field) Airport (ANE) to Cambridge City Airport (CBG)
Event
- NTSB case
- CHI00LA010
- 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
Cessna 172G
- Aircraft type
- Cessna 172
- 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
- N4621L
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Anoka County-Blaine (Janes Field) Airport (ANE), Blaine, MNTo Cambridge City Airport (CBG)
- 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
- 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
- Substantial
Cause areas
- Landing gear, main gear › Fractured
- Unknown › Maintenance, improper
- Unqualified person › Maintenance, annual inspection, inadequate
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The Cessna 172G impacted the runway during landing following a loss of directional control. The right main landing gear strut had fractured at a weld attaching the cabin entry step to the strut. .' Inspection of the right main landing gear revealed that the cabin entry step was welded on the bottom side of the strut. The cabin entry step on the left main landing gear strut was also welded to its strut. There was no logbook entry regarding the welding of the cabin entry step. The last annual inspection was not performed by an inspection authorized (IA) airframe and powerplant mechanic. The Cessna Service Manual states the following under section 5-7, Step Bracket Replacement, 'The step bracket is secured to the landing gear strut with Conley-Weld, or a similar epoxy base adhesive.'
Probable cause
the fractured main landing gear due to the improper maintenance by an unknown person(s) and the inadequate annual inspection by an unqualified person.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CHI00LA010
- Event ID
- 20001212X19921
- Case number
- CHI00LA010
- 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: 1cbaf0f19d90356131026eba5639ed493d375756928de89525cb42d25af7cfe8; retrieved 2026-09-22T13:53:53.879Z.