# NTSB SEA86LA150: Piper J3C, N3667K, Kent, WA, June 22, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 22, 1986, 10:30 local (17:30 UTC)
- Place: Kent, WA
- Coordinates: 47.359706, -122.1007 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.3597&lon=-122.1007&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40426
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA150
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40426/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA150

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise
  - engine assembly,crankshaft - disintegrated (cause)
- Forced landing, landing
- Gear collapsed, landing - roll
  - terrain condition - none suitable (cause)
  - terrain condition - rough/uneven (cause)

## Analysis

A FORCED LANDING WAS MADE AFTER A TOTAL LOSS OF POWER. LANDING WAS ACCOMPLISHED ONTO VERY ROUGH RISING TERRAIN. DURING LANDING ROLL THE LEFT MAIN GEAR COLLAPSED. INVESTIGATION REVEALED A BROKEN CRANKSHAFT. A TOP OVERHAUL HAD BEEN DONE LESS THAN 30 HOURS PRIOR AND A MAJOR OVERHAUL DONE LESS THAN 300 HOURS PRIOR.

## Aircraft

- Registration: N3667K (not matched to a registry record)
- Reported make and model: PIPER J3C
- Category: Airplane
- Serial number: 22358
- Airframe hours: 2120
- Engines: CONTINENTAL C-85-12 85 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Arthur R. Kenyon
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, May 26, 1986, 5 hours before
- Departed: WA77, ENUMCLAW, WA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 62; commercial; airplane ratings: single-engine land, single-engine sea; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 2,714 total, 2,642 in this make and model, 2,653 as pilot in command, 6 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 350° at 8 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 61 °F
- Altimeter: 30.00 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 19860622058119A](https://openairdocs.org/incident/19860622058119A), Jun 22, 1986: Piper J3C/, Kent, WA, Substantial damage. Engine lost oil pressure and power during cruise. Pilot made forced landing in rough terrain. Crankshaft broken.

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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