# NTSB NYC87LA198: Lake LA-250, N1403W, Alton Bay, NH, July 6, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 6, 1987, 10:00 local (14:00 UTC)
- Place: Alton Bay, NH
- Location: 43.4687° N, 71.2320° W: Placed by OpenAirDocs: center of Alton Bay, NH, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.4687&lon=-71.2320&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 16, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 30692
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC87LA198
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30692/pdf
- Page: https://openairdocs.org/ntsb/NYC87LA198

## 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
  - directional control - not maintained, pilot in command (cause)
  - ground loop/swerve - inadvertent, pilot in command (cause)
  - nacelle/pylon,attachment - overload (contributing factor)
  - nacelle/pylon,attachment - separation (contributing factor)
- Nose over, takeoff - aborted

## Analysis

THE LAKE RENEGADE 250 WAS MAKING A WATER TAKEOFF WHEN IT STARTED A SHARP LEFT TURN. THE AIRCRAFT STOPPED IN THE WATER AND THE PILOT EXITED WITHOUT INJURIES PRIOR TO THE AIRCRAFT TURNING OVER. EXAMINATION OF THE AIRCRAFT SHOWED THAT THE ENGINE PYLON HAD SEPARATED FROM THE FUSELAGE AND WAS ATTACHED ONLY BY THE RIGHT FLYING WIRE. THE OWNER HAD THE FAILED PARTS EXAMINED BY A INDEPENDENT LABORATORY AND THEY SAID THAT THERE WAS EVIDENCE OF A PRE-EXISTING FAILURE. WHEN THE PARTS WERE EXAMINED BY THE SAFETY BOARD'S METALLURGICAL LABORATORY, THEY WERE UNABLE TO SUPPORT THE RESULTS OF THE FIRST EXAMINATION AND CONCLUDED THE CAUSE OF THE FAILURE WAS OVERLOAD.

## Aircraft

- Registration: [N1403W](https://openairdocs.org/deregistered/N1403W-2012-12-07), registration cancelled 2012-12-07, S/N 33, built 1985 (OpenAirDocs)
- Reported make and model: LAKE LA-250
- Registry model: [Aerofab LAKE LA-250](https://openairdocs.org/model/aerofab-lake-la-250) (registry code 5110321) (OpenAirDocs)
- Registry engine: [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series) (registry code 41530, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 33
- Airframe hours: 226
- Engines: LYCOMING IO-540-C4B5 250 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Robert E. Gayner
- Airworthiness certificate: Standard, Normal
- Last inspection: Unknown, February 22, 1987
- Destination: BED, BEDFORD, MA
- Airport: Lake Winnipesaukee

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 46; private; airplane ratings: single-engine sea, single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 252 total, 226 in this make and model, 162 as pilot in command, 22 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point -0 °F

## 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 19870706034069A](https://openairdocs.org/incident/19870706034069A), Jul 6, 1987: Conaer LA4200, Alton Bay, NH, Substantial damage. Engine pylon failed during water takeoff. Engine came loose and amphibian rolled over. Seperation shows overload.

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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