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NTSB Report
August 5, 1982 · Mitsubishi MU-2B-25 · N312MA
St. Joseph, MO
Overview
Report Status
Preliminary report
Event Type
Incident
Date
August 5, 1982
Injury Outcomes
No injuries (2 uninjured)
Location
St. Joseph, MO
Aircraft
Mitsubishi MU-2B-25
Tail Number
N312MA
Operator
Bio Zyme Enterprise
Injuries
None
Aircraft Damage
Minor
NTSB Number
MKC82IA137
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.
Full 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.
Flight
Event TypeIncident
Event Time15:45 CDT
Nearest AirportRosecrans Memorial (0nm N)
Runway17
Runway Length8059 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireIflt
Aircraft ExplosionIflt
Aircraft
AircraftMitsubishi MU-2B-25
Tail NumberN312MA
Aircraft CategoryAir
DamageMinor
OperatorBio Zyme Enterprise
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE-331-6-251 · Turboprop · 724
Seats10
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 41 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 10 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point18 C / 0 C
Altimeter30.00 inHg