- Date
- April 21, 1992, 18:45 local (Apr 22, 1992, 00:45 UTC)
- Place
- Mona, UT
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N7252XBeech B36TC
- Weather
- Visual (VMC) · Day
- Status
- Completed · report August 13, 1993
- Report
- Approved by Office Director
- FAA report
- 19920421018879A
- Case key
- 41661
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
A fatigue failure to the crankshaft and a manufacturing material defect.
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
During a cross country flight, the pilot reported that the engine lost power while in cruise flight. The pilot declared an emergency and initiated a forced landing to an open field. During the landing roll, the airplane collided with a ditch. During an engine examination, it was found that the crankshaft was broken between the number two main journal, extending to the number two main journal cheek and number two connecting rod journal. A metallurgical examination revealed an occluded material which appeared to be oxides or other non metallic inclusions produced during the manufacture of the metal prior to forging. The metallurgical report stated,'these oxides most likely provided stress risers which concentrated stresses in the crankshaft to develop cracks under cyclic loading.' The cracks propagated until failure occurred.
Aircraft
- Registration
- N7252X
- Reported as
- Beech B36TC
- Category
- Airplane
- Serial number
- EA-450
- Airframe hours
- 1,248
- Engine
- Continental TSIO-520-UB, 300 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Bodell, Michael J.
- Registered owner
- Bodell, Michael J.
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · June 21, 1991 · 122 hours before
- Departed
- Mt Carmel, UT
- Destination
- SLC · Salt Lake City, UT
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
- 42
- Certificate
- Private
- Airplane ratings
- Multi-engine land, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 3, Valid Medical--w/ waivers/lim
- Seat
- Left
- Flight hours
- 1,398 total · 319 in this make and model · 1,277 as pilot in command · 38 in the last 90 days · 14 in the last 30 days · 3 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 90° at 10 knots
- Visibility
- 20 statute miles
- Temperature
- 64 °F
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 N7252X · 1
Matched to the same aircraft by N-number and date.