# NTSB ANC83LA078: Cessna U206, N49HH, Twin Hills, AK, May 8, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 8, 1983, 08:00 local (16:00 UTC)
- Place: Twin Hills, AK
- Coordinates: 58.819824, -157.860336 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=58.8198&lon=-157.8603&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4116
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC83LA078
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4116/pdf
- Page: https://openairdocs.org/ntsb/ANC83LA078

## Sequence of events

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

- Loss of control - on ground/water, takeoff - roll/run
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)
  - self-induced pressure, pilot in command (contributing factor)
  - terrain condition - rough/uneven (contributing factor)
  - terrain condition - loose gravel/sandy (contributing factor)
  - directional control - not possible, pilot in command
  - ground loop/swerve - uncontrolled, pilot in command
- On ground/water encounter with terrain/water, takeoff

## Analysis

THE PLT WAS DISPATCHED TO A BEACH AREA TO PICK UP PASSENGERS. AFTER LANDING, THE PASSENGERS & BAGGAGE WERE LOADED & THE PLT ATTEMPTED TO TAKEOFF. THE TOP & BOTTOM OF THE BEACH AREA HAD SOME HUMPS OF GRAVEL THAT BLENDED INTO THE BEACH SAND. DURING THE TAKEOFF ROLL, THE DOWN BEACH WHEEL HIT A HUMP. THE ACFT BOUNCED IN THE AIR, SETTLED IN A YAW, ENCOUNTERED LOOSE GRAVEL & SUBSEQUENTLY WENT INTO THE WATER. REPORTEDLY, THERE WAS FIERCE COMPETITION AMONG AIR TAXI OPERATORS FOR LUCRATIVE BUSINESS IN THIS AREA. ALSO, THE BEACH CONDITIONS REPORTEDLY CHANGED WITH THE TIDES.

## Aircraft

- Registration: N49HH (not matched to a registry record)
- Reported make and model: CESSNA U206
- Category: Airplane
- Serial number: U20604477
- Airframe hours: 4850
- Engines: CONTINENTAL IO-520-L 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Registered owner: Yute Air Alaska
- Airworthiness certificate: Standard, Normal
- Destination: DLG, DILLINGHAM, AK
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 21; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 2,190 total, 2,090 as pilot in command, 210 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 43 °F, dew point 37 °F
- Altimeter: 29.00 inHg

## 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 19830508018339A](https://openairdocs.org/incident/19830508018339A), May 8, 1983: Cessna U206G, Twin Hills, AK, Substantial damage. During beach takeoff aircraft hit hump and became airborne prematurely. Aircraft came down in 4 feet of water.

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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