Mitsubishi MU-2B-25 N312MA

Summary

On 5 August 1982 at about 20:45 local time, a Mitsubishi MU-2B-25 registered N312MA, operated by BIO Zyme Enterprise, Inc., was involved in an incident near St. Joseph, Missouri, United States. 2 people were on board and nobody was injured. The aircraft was slightly damaged. No probable cause statement is available for this record.

Date

5 August 1982 at 20:45

Classification

Incident

Location

St. Joseph, Missouri, United States

Nearest airport

Rosecrans Memorial (STJ)

Coordinates

39.8497, -94.8196

Aircraft

Mitsubishi MU-2B-25

Registration

N312MA

Category

Airplane

Engines

2

Operator

BIO Zyme Enterprise, Inc.

Operating rule

Part 91: General Aviation

Purpose of flight

Business

Phase of flight

Not recorded

Route

St. Joseph → Pawhuska

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

MKC82IA137

Nobody was injured.

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

AFTER TAKEOFF, THE PILOT WAS CLEARED TO CLIMB TO 6000 FT MSL. WHILE CLIMBING THROUGH ABOUT 5000 FT, HE HEARD A LOUD NOISE (BAM) AS THE LEFT ENGINE LOST POWER. THE LEFT ENGINE WAS SHUT DOWN AND FEATHERED AND A LANDING WAS MADE WITH NO OTHER PROBLEMS. AN INVESTIGATION REVEALED THAT THE THIRD STAGE TURBINE WHEEL HAD FAILED FROM FATIGUE. PORTIONS OF THE WHEEL, PROPELLED BY CENTRIFUGAL FORCE, EXITED THE RIGHT SIDE OF THE ENGINE CASE AND PENETRATED THE LEFT SIDE OF THE CABIN, RESULTING IN MINOR DAMAGE. THE FAILURE CREATED AN UNBALANCED CONDITION IN THE TURBINE SECTION WHICH ALLOWED AN ASYMMETERICAL LOAD TO BE APPLIED TO THE REAR MAIN BEARING SUPPORT. SUBSEQUENTLY, THE BEARING SUPPORT FAILED, SEPARATED AND IMPACTED THE LEADING EDGE OF THE LEFT HORIZONTAL STABILIZER.

Quoted verbatim from the NTSB record.