# NTSB MIA92LA063: Beech 58, N4188S, West Palm Beach, FL, January 12, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 12, 1992, 16:15 local (21:15 UTC)
- Place: West Palm Beach, FL
- Coordinates: 26.659719, -80.089111 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=26.6597&lon=-80.0891&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed, report August 13, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 33054
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA92LA063
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33054/pdf
- Page: https://openairdocs.org/ntsb/MIA92LA063

## Probable cause

PARTIAL FAILURE OF THE LANDING GEAR MOTOR WHICH CAUSED INTERNAL DAMAGE TO THE LANDING GEAR RETRACT MOTOR AND GEARBOX ASSY.

## Sequence of events

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

- Airframe/component/system failure/malfunction, approach
  - landing gear,normal retraction/extension assembly - failure,partial (cause)
- Gear not extended, landing
  - gear extension - not possible, pilot in command

## Analysis

AFTER ARRIVING IN THE TRAFFIC PATTERN OF THE DESTINATION ARPT, THE PLT LOWERED THE LANDING GEAR SELECTOR HANDLE BUT THE GEAR DID NOT EXTEND.  THE FLT DEPARTED THE PATTERN & ATTEMPTS TO LOWER THE GEAR VIA THE EMERGENCY METHOD WERE UNSUCCESSFUL.  THE FLT DIVERTED TO A LARGER ARPT WHERE A GEAR UP LANDING OCCURRED.  THE LANDING GEAR RETRACT MOTOR & GEARBOX ASSY WAS REMOVED FROM THE ACFT & DISASSEMBLY REVEALED THAT THE WORM SECTOR GEAR REPEATEDLY CONTACTED THE SECTOR GEAR STOP. ALSO, TWO HALF RINGS WHICH SECURE THE BEARING TO THE WORM ACTUATING SHAFT SHEARED. THIS ALLOWED THE WORM GEAR ACTUATOR TO TRAVEL TOWARD THE MOTOR. AS A RESULT, THE HAND CRANK ENGAGING SHAFT WOULD NOT CONTACT THE WORM GEAR ACTUATOR.  ACCORDING TO A MECHANIC, THIS WAS DUE TO A WORN LANDING GEAR MOTOR WHICH WOULD DRIVE THE GEAR BUT WOULD RENDER THE DYNAMIC BRAKING ACTION INOPERATIVE.  THE UP-LIMIT SWITCH WAS TESTED & FOUND TO OPERATE NORMALLY.

## Aircraft

- Registration: [N4188S](https://openairdocs.org/aircraft/N4188S), registered now, S/N TH-620, built 1975 (OpenAirDocs)
- Reported make and model: BEECH 58
- Registry model: [Beech 58](https://openairdocs.org/model/beech-58) (registry code 1152740) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: TH-620
- Airframe hours: 5192
- Engines: CONTINENTAL IO-520C 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Beco Aviation, Inc.
- Registered owner: Beco Aviation, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, December 2, 1991, 150 hours before
- Departed: MYAM, MARSH HARBOUR, OF
- Destination: FPR, FORT PIERCE, FL
- Flight plan: IFR
- Airport: PBI, Palm Beach International, runway 13, 6,930 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 4,500 total, 2,000 in this make and model, 4,000 as pilot in command, 167 in the last 90 days, 53 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 73 °F, dew point 57 °F
- Altimeter: 30.00 inHg
- Observed at: PBI, 1 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 19920112001909A](https://openairdocs.org/incident/19920112001909A), Jan 12, 1992: Beech 58, West Palm Beach, FL, Substantial damage. Unable to extend gear,diverted and landed gear up. Gear motor and transmission gears worn and teeth missing.

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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