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NTSB Report
July 2, 1990 · Mitsubishi MU-2B · N722DM
Tyndall Afb, FL
Overview
Report Status
Probable Cause
Event Type
Incident
Date
July 2, 1990
Injury Outcomes
No injuries (2 uninjured)
Location
Tyndall Afb, FL
Aircraft
Mitsubishi MU-2B
Tail Number
N722DM
Operator
Flight International
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA90IA148
THE PILOT NOTED A SEVERE VIBRATION IN FLIGHT FROM THE LEFT ENGINE. HE SHUT THE ENGINE DOWN AND LANDED. ONE PROPELLER BLADE WAS MISSING PART OF THE BLADE. THE FAILED ASSEMBLY WAS EXAMINED AND THE FAILED BLADE SHOWED EVIDENCE OF HIGH CYCLE, LOW STREES FATIGUE WITH A SURFACE ORIGIN. THE OTHER TWO BLADES WERE FOUND TO BE LESS THAN MINIMUM DIMENSIONS AND HAD IMPROPERLY POLISHED AND PROTECTED SURFACES.
NTSB Probable Cause
A PROPELLER BLADE FATIGUE FAILURE DUE TO IMPROPER OVERHAUL BY OTHER MAINTENANCE PERSONNEL NOT PERFORMING OVERHAUL IN ACCORDANCE WITH FACTORY SERVICE BULLETINS.
Full Narrative
THE PILOT NOTED A SEVERE VIBRATION IN FLIGHT FROM THE LEFT ENGINE. HE SHUT THE ENGINE DOWN AND LANDED. ONE PROPELLER BLADE WAS MISSING PART OF THE BLADE. THE FAILED ASSEMBLY WAS EXAMINED AND THE FAILED BLADE SHOWED EVIDENCE OF HIGH CYCLE, LOW STREES FATIGUE WITH A SURFACE ORIGIN. THE OTHER TWO BLADES WERE FOUND TO BE LESS THAN MINIMUM DIMENSIONS AND HAD IMPROPERLY POLISHED AND PROTECTED SURFACES.
Flight
Event TypeIncident
Event Time14:00 CDT
Nearest AirportTyndall Afb (0nm N)
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMitsubishi MU-2B
Tail NumberN722DM
Aircraft CategoryAir
DamageMinor
OperatorFlight International
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE-331-251 · Turboprop · 715
Seats3
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1First Class
Conditions
ConditionsVMC
LightDaylight
Wind110° @ 10 kt
Visibility7 sm
CeilingNone
Temperature / Dew Point64 F
Altimeter29.00 inHg
Observation Time16:55
Weather SourceWFAC