Beechcraft M35 N313Z

Summary

On 2 May 1982 at about 20:25 local time, a Beechcraft M35 registered N313Z, operated by Gerald G. Boneson, was involved in an accident near Ottumwa, Iowa, United States. 3 people were on board and one had minor injuries. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

2 May 1982 at 20:25

Classification

Accident

Location

Ottumwa, Iowa, United States

Coordinates

41.0091, -92.4097

Aircraft

Beechcraft M35

Registration

N313Z

Category

Airplane

Engines

1

Operator

Gerald G. Boneson

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Waterloo → Harrison

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

MKC82DA068

1 person had minor injuries.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.