# NTSB CHI83FA139: Beech 58, N6838S, Miwaulkee, WI, March 16, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: March 15, 1983, 22:45 local (Mar 16, 1983, 04:45 UTC)
- Place: Miwaulkee, WI
- Coordinates: 42.980144, -87.900939 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.9801&lon=-87.9009&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 11984
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI83FA139
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/11984/pdf
- Page: https://openairdocs.org/ntsb/CHI83FA139

## Sequence of events

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

- In flight collision with terrain/water, landing - flare/touchdown
  - landing gear,normal retraction/extension assembly - failure,total (cause)
  - landing gear,emergency extension assembly - inoperative (contributing factor)
  - gear extension - not possible, pilot in command (contributing factor)
  - wheels up landing - performed, pilot in command (contributing factor)

## Analysis

THE PLT REPORTED THAT HE NOTED A FAIRLY LOUD SOUND AS THE LANDING GEAR LOCKED IN THE UP POSITION. LATER, HE WAS UNABLE TO EXTEND THE GEAR WITH EITHER THE NORMAL OR EMERGENCY SYSTEMS. THE CIRCUIT BREAKER WOULD POP EACH TIME HE TRIED THE NORMAL SYSTEM. THE EMERGENCY GEAR HANDCRANK WOULD NOT ENGAGE TO EXTEND THE GEAR MANUALLY. THE ACFT WAS LANDED WITH THE GEAR RETRACTED. AN INVESTIGATION REVEALED THAT A BUSHING, PN 35-810077-3, IN THE LANDING GEAR ACTUATOR HAD FAILED. THIS ALLOWED A WORM GEAR IN THE ACTUATOR TO MOVE AND JAM THE REDUCTION GEAR. THIS ALSO PREVENTED THE HANDCRANK FROM ENGAGING.

## Aircraft

- Registration: N6838S (not matched to a registry record)
- Reported make and model: BEECH 58
- Category: Airplane
- Serial number: TH720
- Airframe hours: 3374
- Engines: CONTINENTAL IO-520-C 260 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Registered owner: Pci Transportation,Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 17, 1983, 30 hours before
- Departed: ATW, APPLETON, WI
- Destination: MKE, MILWAUKEE, WI
- Flight plan: IFR
- Airport: MKE, Mitchell

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 23; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 1,515 total, 130 in this make and model, 305 as pilot in command, 120 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 60° at 10 knots
- Visibility: 12 statute miles
- Temperature: 36 °F, dew point 28 °F
- Altimeter: 30.00 inHg
- Observed at: GRB, 20 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 19830315009299A](https://openairdocs.org/incident/19830315009299A), Mar 15, 1983: Beech 58, Milwaukee, WI, Substantial damage. Aircraft was landed gear up. Emergency manual gear system would not lower gear, p/n 9581101711

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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