ERA24LA258 · Clapp Saberwing
Clapp Saberwing · Accident: loss of engine power (total) en route
From Valdosta Regional Airport (VLD) to an unrecorded destination
Event
- NTSB case
- ERA24LA258
- 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
Clapp Saberwing
- Aircraft type
- Clapp SABERWING
- 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
- N120SW
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Valdosta Regional Airport (VLD), Valdosta, GATo not recorded
- Aircraft age
- About 10 years (built 2014)
- 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
- En route
- 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
- Loss of engine power (total)
- 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 power plant
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The pilot departed the airport on a local flight to perform system checks of the experimental amateur-built airplane. During a functional check of the ignition system, while the pilot was selecting between the points and electronic ignition at a high engine power setting, the engine lost all power about 8 miles away from the airport. After multiple unsuccessful attempts to restart the engine, the pilot declared an emergency and executed a forced landing to a field. The airplane subsequently impacted a utility line and came to rest inverted in a field about 2 miles from the airport. The right wing, fuselage, and empennage sustained substantial damage. Postaccident examination of the automotive conversion engine revealed that the woodruff key that indexed the crankshaft gear and hub assembly to the crankshaft was sheared. The gear and hub assembly had rotated about 30° from its indexed position, resulting in the crankshaft-to-camshaft timing being out of alignment and a subsequent total loss of engine power. According to the pilot, who had built the engine about 17 years and 20 flight hours before the accident, when switching from points to electronic ignition sources, there was a small interval for the electronics to power up, resulting in a jolt across the engine when power was restored. The jolt, at a high power setting, was likely enough to rotate the gear and shear the woodruff key.
Probable cause
The total loss of engine power due to the shearing of the woodruff key that indexed the crankshaft gear and hub assembly to the crankshaft, which resulted in the gear and hub rotating from their indexed position and caused the crankshaft-to-camshaft timing to become misaligned.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA24LA258
- Event ID
- 20240613194462
- Case number
- ERA24LA258
- 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 2024-06-11.
- API snapshot SHA-256: a6d4ec9c8345fbb69417f82cba803ec481f9a6038064aedbcfccd8aa9aa5cf68; retrieved 2026-09-16T18:53:28.813Z.