# NTSB NYC86LA090: Beech S35, N5629K, Laconia, NH, March 22, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: March 22, 1986, 17:30 local (22:30 UTC)
- Place: Laconia, NH
- Location: 43.5765° N, 71.4823° W: Placed by OpenAirDocs: center of Laconia, NH, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.5765&lon=-71.4823&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 30313
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC86LA090
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30313/pdf
- Page: https://openairdocs.org/ntsb/NYC86LA090

## 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 - normal
  - engine assembly,crankshaft - fatigue (cause)
  - engine assembly,crankshaft - failure,total (cause)
  - fluid,oil - leak
  - window,flight compartment window/windshield - other
  - visual lookout - reduced
- Forced landing, descent - emergency
- In flight collision with object, landing - flare/touchdown
  - object - tree(s) (contributing factor)

## Analysis

DURING CRUISE FLT, THE ACFT ENG FAILED & OIL COVERED THE WINDSHIELD & SIDE WINDOWS. SUBSEQUENTLY, THE ACFT CRASH LANDED INTO WOODED TERRAIN WHILE IN A WINGS LEVEL ATTITUDE AT LOW SPEED. TESTS SHOWED THE ENG CRANKSHAFT HAD FAILED FROM FATIGUE. THE FATIGUE CRACK ORIGINATED AT A SUBSURFACE LOCATION.

## Aircraft

- Registration: [N5629K](https://openairdocs.org/deregistered/N5629K-1989-07-27), registration cancelled 1989-07-27, S/N D7388 (OpenAirDocs)
- Reported make and model: BEECH S35
- Registry model: [Beech S35](https://openairdocs.org/model/beech-s35) (registry code 1151532) (OpenAirDocs)
- Category: Airplane
- Serial number: D-7388
- Airframe hours: 3977
- Engines: CONTINENTAL IO-520 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Omega Aviation, Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 28, 1986
- Departed: 8B2, TWIN MOUNTAIN, NH
- Destination: BED, BEDFORD, MA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 69; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 1,450 total, 1,200 as pilot in command, 18 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 28 °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 19860322007469A](https://openairdocs.org/incident/19860322007469A), Mar 22, 1986: Beech S35, Laconia, NH, Substantial damage. The engine failed, covering the windshield with oil. The aircraft struck trees. Metal fatigue of the crankshaft.

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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