# NTSB MIA90LA051: Mitsubishi MU-2B-25, N666HB, Jacksonville, FL, January 9, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 9, 1990, 17:35 local (22:35 UTC)
- Place: Jacksonville, FL
- Coordinates: 30.360136, -81.510932 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=30.3601&lon=-81.5109&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 17, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 32612
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA90LA051
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32612/pdf
- Page: https://openairdocs.org/ntsb/MIA90LA051

## Probable cause

FAILURE OF THE OWNER/OPERATOR TO OBTAIN PROPER MAINTENANCE AND INSPECTION OF THE AIRCRAFT.  FACTORS RELATED TO THE ACCIDENT WERE: OPERATION OF THE AIRCRAFT BY THE PILOT WITHOUT A CURRENT ANNUAL INSPECTION (KNOWN DEFICIENCY), AN OIL LEAK IN THE LEFT ENGINE WHICH RESULTED IN OIL EXHAUSTION, AND AN UNDETERMINED PROPELLER CONTROL LINKAGE PROBLEM WITH THE RIGHT ENGINE.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - nonmechanical, cruise - normal
  - 1 engine
  - maintenance,annual inspection - not performed, company/operator management (cause)
  - operation with known deficiencies in equipment - performed, pilot in command (contributing factor)
  - lubricating system - leak (contributing factor)
  - fluid,oil - exhaustion (contributing factor)
  - propeller feathering - performed, pilot in command
  - initiated, pilot in command
  - precautionary landing - initiated, pilot in command
- Loss of engine power(partial) - mech failure/malf, approach - vfr pattern - final approach
  - 1 engine - output low
  - propeller control,linkage - undetermined (contributing factor)
- Forced landing, landing
- Ditching, landing

## Analysis

THE LT PROP & ENG WERE FEATHERED & SECURED DUE TO LOW OIL PRESSURE. THE PLT DIVERTED TO AN ALTERNATE ARPT. DURING FINAL APCH WITH A LANDING CONFIGURATION, HE APPLIED POWER, BUT THE RT ENG PROVIDED ONLY ABOUT 40% TORQUE. ATMTS TO CORRECT THE PROBLEM WERE UNSUCCESSFUL. THE PLT RETRACTED THE GEAR & DITCHED THE ACFT. EXAM OF LT ENG NACELLE REVEALED OIL LEAKAGE FROM AN UNKNOWN SOURCE, WHICH DEPLETED THE OIL SUPPLY. THE RT ENG CONDITION & POWER LEVERS WERE OPERATIONALLY CHECKED. WHEN MOVED, THE LINKAGE AT THE PROP GOVERNOR DID NOT MOVE; THE FUEL CONTROL CONCENTRIC SHAFT CONTROL LINKAGE ASSY WAS 'STIFF.'  NO DETERMINATION COULD BE MADE AS TO WHY THE PROP GOVERNOR DID NOT MOVE WHEN THE CONDITION LEVER WAS MOVED. THE RT ENG WAS REMOVED FOR AN ENG RUN. IT OPERATED NORMALLY. THE PROP GOVERNOR & PROP PITCH CONTROL WERE TESTED; THEY OPERATED NORMALLY. THE LAST ANNUAL INSPN WAS DATED 3/5/84. A 100 HR INSPN OF THE AIRFRAME (ONLY) WAS PERFORMED 2.3 FLT HRS BEFORE THE ACDNT. THE ENG LOGBOOKS WERE NOT LOCATED.

## Aircraft

- Registration: [N666HB](https://openairdocs.org/deregistered/N666HB-1994-06-14), registration cancelled 1994-06-14, S/N 281 (OpenAirDocs)
- Reported make and model: MITSUBISHI MU-2B-25
- Registry model: [Mitsubishi MU-2B-25](https://openairdocs.org/model/mitsubishi-mu-2b-25) (registry code 5780409) (OpenAirDocs)
- Category: Airplane
- Serial number: 281
- Airframe hours: 3353
- Engines: GARRETT TPE-331M 665 horsepower turbo prop
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Riggs, Charles A.
- Registered owner: Riggs, Charles A
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, December 11, 1989, 2 hours before
- Departed: AGS, AUGUSTA, GA
- Destination: VRB, VERO BEACH, FL
- Airport: CRG, Craig Muni

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 14,000 total, 600 in this make and model, 13,500 as pilot in command, 51 in the last 90 days, 5 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 5 knots
- Visibility: 7 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 54 °F, dew point 48 °F
- Altimeter: 30.00 inHg
- Observed at: CRG, 4 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19900109000339A](https://openairdocs.org/incident/19900109000339A), Jan 9, 1990: Mtsbsi MU2B25, Jacksonville, FL, Substantial damage. Secured left engine due low oil pressure. Diverted right one failed on final. Ditched.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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