# NTSB SEA82DA031: Cessna 172N, N4787E, Redmond, WA, February 28, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: February 28, 1982, 10:18 local (18:18 UTC)
- Place: Redmond, WA
- Coordinates: 47.679153, -122.120368 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.6792&lon=-122.1204&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report February 28, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72362
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA82DA031
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72362/pdf
- Page: https://openairdocs.org/ntsb/SEA82DA031

## Analysis

THE STUDENT AND INSTRUCTOR WERE PRACTICING WATER LANDINGS ON LAKE SAMMAMISH NEAR REDMOND, WA. THE WINDS WERE INITIALLY CALM. ON THE SECOND LANDING, IT WAS NOTED THAT THE WIND BEGAN TO PICK UP. REPORTEDLY, WIND SHEAR WAS ENCOUNTERED DURING FINAL APPROACH FOR THE THIRD LANDING. A HIGH SINK RATE DEVELOPED AND THE PLANE LANDED HARD. THE FRONT OF THE LEFT FLOAT SPLIT OPEN AND FILLED WITH WATER. THE AIRCRAFT SLOWLY ROLLED OVER AND SANK.

## Sequence of events

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

- Hard landing, landing - flare/touchdown
  - weather condition - unfavorable wind (contributing factor)
  - compensation for wind conditions - improper, dual student (cause)
  - supervision - inadequate, pilot in command(cfi) (cause)
  - landing gear,float assembly - failure,partial

## Aircraft

- Registration: [N4787E](https://openairdocs.org/aircraft/N4787E), registered now, S/N 17271652, built 1978 (OpenAirDocs)
- Reported make and model: CESSNA 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (registry code 2072434) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 17271652
- Airframe hours: 1989
- Engines: LYCOMING O-320-H2AD 160 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Kenmore Air Harbor, Incorporat
- Registered owner: Kenmore Air Harbor, Incorporat
- Departed: S60, KENMORE, WA
- Destination: S60, KENMORE, WA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 34; commercial, flight instructor; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 1,480 total, 425 in this make and model, 1,210 as pilot in command, 90 in the last 90 days, 30 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 60 statute miles
- Temperature: 108 °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 19820228001219A](https://openairdocs.org/incident/19820228001219A), Feb 28, 1982: Cessna 172N, Redmond, WA, Substantial damage. Pilot made hard landing causing float to split and sink, rolling aircraft over.

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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