# Accident 20080404835439A: Bardou QUADCITYULTR, Sobieski, WI, April 4, 2008

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 4, 2008, 12:00 local time
- Place: Sobieski, WI
- Damage: Substantial damage
- Phase of flight: Fcd/Prec Ldg From Cruise
- Operating rules: General operating rules (Part 91)
- Location: 44.6339° N, 88.2014° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=44.6339&lon=-88.2014&mi=10
- Aircraft: N423V, a cancelled registration (https://openairdocs.org/deregistered/N423V-2017-10-31) (OpenAirDocs)
- Registry model: Bardouche Gerald J QUAD CITY ULTRALIGHT (registry code 05622ZU, https://openairdocs.org/model/bardouche-gerald-j-quad-city-ultralight) (OpenAirDocs)
- Registry engine: Rotax 503 DCDI (registry code 55566, https://openairdocs.org/engine/rotax-503-dcdi) (OpenAirDocs)
- Reported make and model: BARDOU QUADCITYULTR
- Reported engine: ROTAX ROTAX503
- Fatal injuries: 0
- Pilot flight hours: 252 total, 252 in this make and model, 4 in the last 90 days
- NTSB investigation: [NTSB CHI08CA114](https://openairdocs.org/ntsb/CHI08CA114) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20080404835439A

## Narrative

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

(-23) TOOK OFF FROM PULASKI AIRPORT AND LANDED AT OCCONTO AIRPORT. LEFT OCCONTO TO RETURN TO PULASKI. WHILE IN CRUISE AT AROUND 1300 FEET THE ENGINE LOST RPM TO IDLE OR BELOW. RPM DROP WAS RAPID. ENGINE CONTROLS HAD NO EFFECT ON ENGINE RPM. AIRCRAFT ENDED UP IN A GROVE OF PINE TREES STUCK ABOUT 25 FEET UP. OWNER/OPERATOR INDICATED THAT DURING WRECKAGE RECOVERY HE NOTICED A SPARK PLUG HAD FALLEN OUT OF THE SPARK PLUG BORE. HE STATED THAT HE HAD PREVIOUSLY USED A "THREAD CHASER" TO CLEAN UP THE THREADS OF THAT PLUG BORE. ENGINE WAS INSPECTED BY INSPECTOR ^PRIVACY DATA OMITTED^. INVESTIGATION REVEALED THAT THE SPARK PLUG BORE THREADS HAD BEEN RECUT OVERSIZE WHERE THREAD BORE/PLUG WAS A LOOSE FIT.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CHI08CA114](https://openairdocs.org/ntsb/CHI08CA114), Apr 4, 2008: Bardouche Quad City Ultralight (N423V), Pulaski, WI, substantial damage. Probable cause: The loss of engine power during cruise due to the separation of the spark plug because of the loose threads. Contributing to the accident was trees.

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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