- Date
- May 2, 1982, 15:25 local (20:25 UTC)
- Place
- Ottumwa, IA
- Injuries
- 1 minor, 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N313ZBeech M35
- Weather
- Visual (VMC) · Day
- Status
- Completed · report May 2, 1983
- Report
- Approved by Office Director
- FAA report
- 19820502015119A
- Case key
- 72123
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
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 flight, the engine RPM exceeded its maximum limit. The pilot attempted to reduce the RPM by using the propeller control, but this had no effect. The pilot was in the process of shutting down the engine when engine oil sprayed out the cowling and onto the windshield. Unable to glide to an airport, he elected to land in a corn field. As he approached the field, he saw powerlines in his glide path, then landed hard with the gear retracted after maneuvering to avoid the lines. A teardown of the engine revealed that the no. 3 cylinder exhaust valve guide was worn well beyond its service limit and allowed excessive blowby from the crankcase. The oil supply had been depleted and there was deterioration of metal to metal parts due to loss of lubrication. The valve guide, pn 631496, had been out of production for about 8 or 9 years.
Aircraft
- Registration
- N313Z
- Reported as
- Beech M35
- Category
- Airplane
- Serial number
- D-6465
- Engine
- Continental IO-470-C, 250 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Gerald G. Boneson
- Registered owner
- Gerald G. Boneson
- Departed
- ALO · Waterloo, IA
- Destination
- HRO · Harrison, IA
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
- 35
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Valid Medical--w/ waivers/lim
- Flight hours
- 446 total · 98 in this make and model · 348 as pilot in command · 46 in the last 90 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 220° at 8 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- 6,500 ft broken
- Temperature
- 151 °F
- Altimeter
- 30.00 inHg
- Observed at
- OTM
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 N313Z · 3
Matched to the same aircraft by N-number and date.