WPR21LA117 · Piper PA-44-180
Piper PA-44-180 · Accident: landing gear collapse
Event
- NTSB case
- WPR21LA117
- 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
- Event fatalities
- Unknown
- 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
Piper PA-44-180
- Aircraft type
- Piper PA-44
- 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
- N125MG
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- Aircraft age
- About 19 years (built 2002)
- 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
During the instructional flight, the right main landing gear separated during landing roll following a normal touchdown. The separated right landing gear assembly then struck the rear edge of the wing, which resulted in substantial damage to the wing. Examination revealed that the right landing gear strut piston tube had failed due to two fatigue cracks that had originated from corrosion pits near a drilled hole. Two months before the accident, the manufacturer had issued a service letter applicable to the airplane that called for inspection of the strut piston tube for fatigue cracks. Performance of the inspection called for in the service letter would have discovered the cracks that led to the accident. Although the operator held a Part 141 certificate, they were not required to comply with the service letter.
Probable cause
Failure of the landing gear strut piston tube due to fatigue cracking from corrosion pitting.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record WPR21LA117
- Event ID
- 20210224102669
- Case number
- WPR21LA117
- 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, cause areas. 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: 38d3f60db2e76955a10e80d45251038d71b0363467105634866882cc60758002; retrieved 2026-09-16T13:44:30.460Z.