# Accident 19960721022799A: Boeing A75N1, East Troy, WI, July 21, 1996

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 21, 1996, 10:11 local time
- Place: East Troy, WI
- Airport: East Troy Municipal Airport
- Damage: Substantial damage
- Phase of flight: Roll-Out (Fixed Wing)
- Operating rules: General operating rules (Part 91)
- Location: 42.7793° N, 88.3893° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=42.7793&lon=-88.3893&mi=10
- Aircraft: N58712, registered now (https://openairdocs.org/aircraft/N58712) (OpenAirDocs)
- Registry model: Boeing A75N1(PT17) (registry code 1380134, https://openairdocs.org/model/boeing-a75n1-pt17) (OpenAirDocs)
- Registry engine: Pratt & Whitney R-985 series (registry code 52008, https://openairdocs.org/engine/pratt-whitney-r-985-series) (OpenAirDocs)
- Reported make and model: BOEING A75N1
- Reported engine: CONT W670*
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 532 total, 56 in this make and model, 15 in the last 90 days
- NTSB investigation: [NTSB CHI96LA252](https://openairdocs.org/ntsb/CHI96LA252) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19960721022799A

## Narrative

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

(.4)THE PILOT REPORTED THAT HE FLEW A 'NORMAL' APPROACH TO LAND ON RUNWAY 8. DURING THE LANDING ROLL, THE AIRPLANE BEGAN TO 'DRIFT' TO THE RIGHT. THE PILOT 'APPLIED THE BRAKES GENTLY' AND THE AIRPLANE NOSED OVER. EXAMINATION OF THE AIRPLANE REVEALED THE LEFT RUDDER HORN WAS FRACTURED. NO OTHER EVIDENCE OF MECHANICAL MALFUNCTION WAS REPORTED. METALLURGICAL EXAMINTION OF THE RUDDER HORN 'SHOWED NO EVIDENCE OF PROGRESSIVE CRACKING, SUCH AS FATIGUE. THE FRACTURE WAS TYPICAL OF AN OVERSTRESS SEPARATION. THERE WAS THINNING OF THE WALL AND CORROSION PITS ON THE INSIDE SURFACE OF THE TUBE... .' MEASUREMENTS OF SOME OF THE CORROSION PITS REVEALED THAT THE THICKNESS OF THE .035 INCH WALL TUBING WAS CORRODED TO A THICKNESS OF .008 INCHES IN SOME AREAS.  'THERE WAS NO INDICATION THAT ANY OF THE CORROSION PITS HAD PENETRATED THROUGH THE TUBE TO THE OUTSIDE SURFACE.'                                  (-23) ON JULY 21, 1996 AT APPROXIMATELY 1130 (CDST) BOEING, AN75N1 (STEARMAN) N58712, TIPPED OVER DURING LANDING ROLLOUT ON RUNWAY 08, EAST TROY, WISCONSIN. THE PRIVATE PILOT AND ONE PASSENGER WERE UNINJURED. THE AIRCRAFT SUSTAINED MINOR DAMAGE. THE AIRCRAFT WAS BEING OPERATED UNDER 14 CFR PART 91 W HEN THE ACCIDENT OCCURRED. VISUAL METEOROLOGICAL CONDITIONS PREVAILED AT THE TIME OF THE ACCIDENT. INVESTIGATION REVEALED THE LEFT RUDDER HORN WAS BROKEN. DUE TO DAMAGE TO THE VERTICAL STABILIZER AND RUDDER IT CANNOT BE DETERMINED IF THIS CONDITION EXISTED PRIOR TO IMPACT OR A RESULT OF THE IMPACT. A MALFUNCTION OR DEFECT REPORT, FAA FORM 8010-4, HAS BEEN SUBMITTED PERTINENT TO THE FAILURE.

## 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 CHI96LA252](https://openairdocs.org/ntsb/CHI96LA252), Jul 21, 1996: Boeing A75N1 (N58712), East Troy, WI, substantial damage. Probable cause: corrosion and fracture of the rudder control horn.

## Other reports on N58712 (2)

Matched to the same aircraft by N-number and date.

- [Incident 19980727038979I](https://openairdocs.org/incident/19980727038979I), Jul 27, 1998: Boeing A75N1 (N58712), Oshkosh, WI, Minor damage. (-5)On July 27, 1998, at approximately 1100 CDT a Boeing A75N1, N58712 ground looped while landing in a cross wind on runway 18 Oshkosh airport, Oshkosh,…
- [Accident 19760822023359A](https://openairdocs.org/incident/19760822023359A), Aug 22, 1976: Boeing A75N1 (N58712), Animas, NM, Substantial damage. Ldg gears torn off. Dust devil or downdraft caused acft to settle during power approach.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.