- Date
- July 2, 1990, 14:00 local (19:00 UTC)
- Place
- Tyndall Afb, FL
- Injuries
- 2 uninjured
- Damage
- Minor damage
- Phase of flight
- Enroute
- Aircraft
- N722DMMitsubishi MU-2B
- Weather
- Visual (VMC) · Day
- Status
- Completed · report November 9, 1992
- Report
- Approved by Office Director
- Case key
- 32584
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.
On this page
Probable cause
A propeller blade fatigue failure due to improper overhaul by other maintenance personnel not performing overhaul in accordance with factory service bulletins.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N722DM
- Reported as
- Mitsubishi MU-2B
- Category
- Airplane
- Serial number
- 245
- Airframe hours
- 7,059
- Engine
- Garrett TPE-331-251, 715 horsepower, turbo prop
- Damage
- Minor damage
- Flight
- Other work use · Part 91
- Operator
- Flight International
- Registered owner
- Flight International Of Fl.
- Airworthiness certificate
- Standard, Normal
- Last inspection
- AAIP · March 21, 1990 · 97 hours before
- Flight plan
- IFR
- Airport
- KPAM · Tyndall Afb
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Certificate
- Commercial
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Valid Medical--w/ waivers/lim
- Seat
- Left
- Flight hours
- 6,641 total · 1,533 in this make and model · 6,441 as pilot in command · 143 in the last 90 days · 39 in the last 30 days · 3 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 110° at 10 knots
- Visibility
- 7 statute miles
- Lowest ceiling
- None
- Temperature
- 82 °F, dew point 64 °F
- Altimeter
- 29.00 inHg
- Observed at
- PAM, 5 nm away