# NTSB MIA83FA227: Stol UC-1, N9510U, Lake Hamilton, FL, September 10, 1983

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: September 10, 1983, 13:00 local (17:00 UTC)
- Place: Lake Hamilton, FL
- Coordinates: 28.03997, -81.620063 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=28.0400&lon=-81.6201&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal, 1 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 30807
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA83FA227
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30807/pdf
- Page: https://openairdocs.org/ntsb/MIA83FA227

## Sequence of events

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

- Loss of control - in flight, landing - flare/touchdown
  - supervision - inadequate, pilot in command(cfi) (cause)
  - flare - improper, dual student (cause)
  - stall - inadvertent, dual student (cause)
  - lack of total experience in type of aircraft, dual student (contributing factor)
- In flight collision with terrain/water, landing - flare/touchdown
  - misc eqpt/furnishings,shoulder harness - other

## Analysis

THE STUDENT WAS A COMMERCIAL PLT WITH RATINGS IN SINGLE & MULTI-ENG LAND & SINGLE ENG SEA ACFT. HE WAS ON HIS 1ST FLT IN THIS MAKE & MODEL OF ACFT TO RECEVE INSTRUCTION FOR A MULTI-ENG SEA RATING. AFTER INSTRUCTING WATER LANDINGS WITH FLAPS, THE INSTRUCTOR TOLD THE STUDENT TO MAKE A NO-FLAP LANDING ON THE WATER. ACCORDING TO THE STUDENT, THE LANDING APCH LOOKED NORMAL. WHEN HE RETARDED THE THROTTLES TO IDLE IN THE FLARE, HIS INSTRUCTOR SAID SOMETHING IN A LOUD VOICE. THEREAFTER, HE FOUND HIMSELF UNDER WATER. AFTER DISCONNECTING HS SEAT BELT, HE CAME TO THE SURFACE & WAS EVENTUALLY PICKED UP BY PERSONNEL IN A BOAT. THE STUDENT THOUGHT A DOOR MIGHT HAVE COME OPEN, BUT HE DID NOT KNOW. MOST OF THE WRECKAGE WAS RECOVERED.  THE COCKPIT DOORS WERE NOT RECOVERED, BUT THERE WAS EVIDENCE THAT THEY HAD SEPARATED DURING IMPACT. MAJOR IMPACT DAMAGE TO THE ACFT WAS IN THE NOSE & COCKPIT AREA. NO PREIMPACT FAILURE WAS FOUND. THE 1250 EDT WIND AT LAKELAND, FL (7 MI WEST) WAS CALM. NO SHOULDER HARNESS INSTALLED, CFI FATALLY INJURED.

## Aircraft

- Registration: [N9510U](https://openairdocs.org/deregistered/N9510U-2014-11-24), registration cancelled 2014-11-24, S/N 019 (OpenAirDocs)
- Reported make and model: STOL AIRCRAFT UC-1
- Registry model: [Stol UC-1](https://openairdocs.org/model/stol-uc-1) (registry code 8640202) (OpenAirDocs)
- Category: Airplane
- Serial number: 019
- Airframe hours: 1400
- Engines: LYCOMING IO-360-B1D 180 horsepower reciprocating
- Damage: Destroyed
- Flight: Instructional, Part 91
- Registered owner: Jack Brown'S Seaplane Base Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, June 22, 1983, 101 hours before
- Departed: GIF, WINTER HAVEN, FL

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 62; flight instructor, commercial; airplane ratings: single-engine land, multi-engine sea, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: right; toxicology performed; flight hours: 13,623 total, 657 in this make and model, 134 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 10 statute miles
- Lowest ceiling: 3,000 ft broken
- Temperature: 88 °F, dew point 73 °F
- Altimeter: 30.00 inHg
- Observed at: LAL, 7 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 19830910047869A](https://openairdocs.org/incident/19830910047869A), Sep 10, 1983: Stolac UC1, Lake Hamilton, FL, Destroyed. Report indicates amphibian struck water nose down on final as a cabin door hinged from the front came open.

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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