# NTSB SEA83LA195: Mooney M20-F, N3525X, Seattle, WA, September 3, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 3, 1983, 12:20 local (19:20 UTC)
- Place: Seattle, WA
- Coordinates: 47.649181, -122.399238 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.6492&lon=-122.3992&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 39767
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA83LA195
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39767/pdf
- Page: https://openairdocs.org/ntsb/SEA83LA195

## Sequence of events

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

- Loss of engine power, cruise - normal
  - reason for occurrence undetermined (cause)
- Ditching, landing - flare/touchdown

## Analysis

THE PLT STATED HE EXPERIENCED A COMPLETE POWER LOSS WHILE FLYING OVER PUGET SOUND AT 700 FT. THE ACFT SANK & WAS NOT RECOVERED.

## Aircraft

- Registration: [N3525X](https://openairdocs.org/deregistered/N3525X-2012-10-04), registration cancelled 2012-10-04, S/N 670062, built 1966 (OpenAirDocs)
- Reported make and model: MOONEY M20-F
- Registry model: [Mooney M20F](https://openairdocs.org/model/mooney-m20f) (registry code 5870214) (OpenAirDocs)
- Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 670062
- Airframe hours: 2700
- Engines: LYCOMING IO-360-A1A 200 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Registered owner: William W. Stephan
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, December 1, 1982
- Departed: YVR, VANCOUVER
- Destination: BFI, SEATTLE, WA
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 1,104 total, 1,000 in this make and model, 1,004 as pilot in command, 10 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 7 knots
- Visibility: 10 statute miles
- Lowest ceiling: 1,500 ft broken
- Temperature: 66 °F, dew point 55 °F
- Altimeter: 30.00 inHg
- Observed at: BFI, 12 nm away

## Other investigations on N3525X (2)

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.

- [NTSB OAK72DVM22](https://openairdocs.org/ntsb/OAK72DVM22), Jan 24, 1972: Mooney M21F (N3525X), Salinas, CA, substantial damage
- [NTSB OAK71DVG80](https://openairdocs.org/ntsb/OAK71DVG80), May 16, 1971: Mooney M20F (N3525X), Pope Valley, CA, substantial damage

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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