# Incident 19990921031359I: Cessna 421C, Eugene, OR, September 21, 1999

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: September 21, 1999, 17:41 local time
- Place: Eugene, OR
- Airport: Mahlon Sweet Field
- Damage: Minor damage
- Phase of flight: Normal Cruise
- Operating rules: General operating rules (Part 91)
- Location: 44.1246° N, 123.2120° W: Placed by OpenAirDocs at MAHLON SWEET FLD (EUG), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.1246&lon=-123.2120&mi=10
- Aircraft: N6VH, a cancelled registration (https://openairdocs.org/deregistered/N6VH-2003-04-04) (OpenAirDocs)
- Registry model: Cessna 421C (registry code 2076016, https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Registry engine: Continental GTSI0-520-F-K (registry code 17031, https://openairdocs.org/engine/continental-gtsi0-520-f-k) (OpenAirDocs)
- Reported make and model: CESSNA 421C
- Reported engine: CONT GTSIO520N
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 1,400 total
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990921031359I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) LEFT ENGINE FAILED 20 MILES NORTH OF EUGENE. FOREIGN OBJECT DAMAGE WITHIN THE LEFT ENGINE GEAR ASSEMBLY CAUSED THE IDLER GEAR SUPPORT PIN THAT SITS BETWEEN MAGNETO DRIVES TO SHEAR, CAUSING THE MOUNT STUDS TO BREAK AND THE GEAR THAT IT RIDES ON TO ROTATE AND BECOME UNMESHED.  IT AFFECTED MAGNETO TIMING AND CAUSED THE ENGINE TO LOSE POWER AND BEGIN RUNNING ROUGH.  PILOT SHUT DOWN THE ENGINE AND RETURNED TO EUGENE.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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