- Date
- July 21, 1996, 10:11 local (15:11 UTC)
- Place
- East Troy, WI
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N58712Boeing A75N1
- Weather
- Visual (VMC) · Day
- Status
- Completed · report August 29, 1997
- Report
- Approved by Office Director
- FAA report
- 19960721022799A
- Case key
- 10322
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
corrosion and fracture of the rudder control horn.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.'
Factual narrative
On July 21, 1996, at 1011 central daylight time, a Boeing A75N1, N58712, sustained substantial damage when it nosed over during the landing roll at the East Troy Municipal Airport, East Troy, Wisconsin. The private pilot and one passenger reported no injuries. The personal, 14 CFR Part 91 flight originated in Staughton, Wisconsin, about 0940. Visual meteorological conditions prevailed and no flight plan was filed.
The pilot reported that he flew a "normal" approach to land on runway 08. During the landing roll, the airplane began to "drift" to the right. He "applied the brakes gently" and the airplane nosed over.
The airplane was inspected by a Federal Aviation Administration (FAA) inspector. He reported that the left rudder horn was fractured. No other evidence of mechanical malfunction was reported.
The rudder horn was examined by an engineering technician in the NTSB materials laboratory. In his factual report, the technician reported that the fracture "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."
Aircraft
- Registration
- N58712
- Reported as
- Boeing A75N1
- Category
- Airplane
- Serial number
- 75-341
- Airframe hours
- 1,900
- Engine
- Continental W-670, 220 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Registered owner
- John J. Vorndran
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · October 1, 1995 · 13 hours before
- Departed
- Staughton, WI
- Destination
- 57C
- Airport
- 57C · East Troy Municipal, runway 8, 3,900 × 75 ft, asphalt
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 60
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Valid Medical--w/ waivers/lim
- Seat
- Rear
- Flight hours
- 532 total · 56 in this make and model · 500 as pilot in command · 15 in the last 90 days · 15 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 140° at 9 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 19 °F, dew point 14 °F
- Altimeter
- 30.00 inHg
- Observed at
- MKE, 22 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N58712 · 3
Matched to the same aircraft by N-number and date.