# NTSB SEA86LA057: Cessna 172, N739UW, Renton, WA, February 12, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 12, 1986, 15:25 local (23:25 UTC)
- Place: Renton, WA
- Coordinates: 47.399902, -122.189102 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.3999&lon=-122.1891&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40354
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA057
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40354/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA057

## 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
  - directional control - not maintained, pilot in command (cause)
- On ground/water collision with object, takeoff - roll/run
  - object - vehicle
  - object - building(nonresidential)

## Analysis

THE PILOT FAILED TO MAINTAIN DIRECTIONAL CONTROL DURING TAKEOFF. ALTHOUGH A CROSSWIND FROM THE LEFT WAS PRESENT THE PILOT LOST CONTROL FOR UNKNOWN REASONS TO THE LEFT, CROSSING THE TAXIWAY AND THEN STRIKING A PARKED VEHICLE AND BUILDING. NO MECHANICAL REASON FOR CONTROL LOSS COULD BE FOUND.

## Aircraft

- Registration: [N739UW](https://openairdocs.org/deregistered/N739UW-1989-09-12), registration cancelled 1989-09-12, S/N 17270826 (OpenAirDocs)
- Reported make and model: CESSNA 172
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (registry code 2072434) (OpenAirDocs)
- Category: Airplane
- Serial number: 17270826
- Engines: LYCOMING O-320-H2AD 160 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Norman Grier
- Airworthiness certificate: Standard, Normal
- Departed: RTN, RENTON, WA
- Destination: S36, KENT, WA
- Airport: RTN, Renton Muni, runway 33, 5,379 × 200 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; student; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 1 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 320° at 15 knots, gusting 21
- Visibility: 90 statute miles
- Lowest ceiling: none
- Temperature: 45 °F
- Altimeter: 29.00 inHg
- Observed at: RTN

## 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 19860212002829A](https://openairdocs.org/incident/19860212002829A), Feb 12, 1986: Cessna 172N, Renton, WA, Substantial damage. Directional control was lost on takeoff roll. Aircraft struck a building and a parked truck.

## Other investigations on N739UW (1)

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 SEA85LA005](https://openairdocs.org/ntsb/SEA85LA005), Oct 7, 1984: Cessna 172N (N739UW), Ashford, WA, 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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