Beechcraft B36TC N7252X

Summary

On 22 April 1992 at about 00:45 local time, a Beechcraft B36TC registered N7252X, operated by Bodell, Michael J., was involved in an accident near Mona, Utah, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

22 April 1992 at 00:45

Classification

Accident

Location

Mona, Utah, United States

Coordinates

39.8502, -111.8406

Aircraft

Beechcraft B36TC

Registration

N7252X

Category

Airplane

Engines

1

Operator

Bodell, Michael J.

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Mt Carmel → Salt Lake City

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

SEA92LA082

Nobody was injured.

A FATIGUE FAILURE TO THE CRANKSHAFT AND A MANUFACTURING MATERIAL DEFECT.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.