# NTSB SEA86LA076: Beech 18, N926T, Seattle, WA, March 11, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 10, 1986, 20:06 local (Mar 11, 1986, 04:06 UTC)
- Place: Seattle, WA
- Coordinates: 47.439689, -122.279129 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.4397&lon=-122.2791&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40366
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA076
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40366/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA076

## 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
  - proper alignment - not maintained, pilot in command (cause)
- On ground/water encounter with terrain/water, takeoff - roll/run
  - ground loop/swerve - inadvertent, pilot in command (cause)

## Analysis

THE PILOT LOST CONTROL OF THE AIRCRAFT ON TAKEOFF AND A SUBSEQUENT GROUNDLOOP OCCURRED. ALTHOUGH THE PILOT HAS A DC-3 TYPE RATING, HE HAD ONLY 20 HOURS IN THIS AIRCRAFT.

## Aircraft

- Registration: N926T (not matched to a registry record)
- Reported make and model: BEECH 18
- Category: Airplane
- Serial number: BA711
- Airframe hours: 3074
- Engines: P&W PT6-27 680 horsepower turbo prop
- Damage: Substantial damage
- Flight: Part 135
- Operator: Methow Aviation
- Airworthiness certificate: Standard, Normal
- Destination: BOI, BOISE, ID
- Flight plan: IFR
- Airport: SEA, Seattle-Tacoma Inter'L, runway 16, 11,900 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 4,178 total, 20 in this make and model, 4,008 as pilot in command, 203 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 120° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 54 °F, dew point 37 °F
- Altimeter: 29.00 inHg
- Observed at: SEA

## 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 19860310006419A](https://openairdocs.org/incident/19860310006419A), Mar 10, 1986: Beech STC18BEECH, Seattle, WA, Substantial damage. Lost directional control after tail was lifted from runway on takeoff. Ground looped, collapsing right main gear.

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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