# NTSB SEA86LA116: Mooney M20C, N6494U, Twin Falls, ID, May 2, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: May 2, 1986, 09:55 local (16:55 UTC)
- Place: Twin Falls, ID
- Coordinates: 42.409992, -114.58995 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.4100&lon=-114.5900&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40399
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA116
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40399/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA116

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - weather condition - crosswind (contributing factor)
  - compensation for wind conditions - inadequate, pilot in command (cause)
  - directional control - not attained, pilot in command (cause)
- Loss of control - in flight, takeoff
  - aborted landing - performed, pilot in command
  - airspeed(vs) - not attained, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - stall/mush

## Analysis

DURING FINAL APCH THE ATCT ADVISED THE PLT OF A 17 KT X-WIND WITH GUSTS TO 22 KTS. THE PLT LANDED BUT WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL AND THE ACFT DEPARTED THE RWY INTO A GRASS AREA. THE PLT ATTEMPTED TO TAKEOFF AGAIN, THE WIND LIFTED UP THE WING AND THE ACFT TURNED DOWNWIND. THE ACFT SETTLED BACK TO THE GROUND NEXT TO THE RWY WHERE IT TRAVELED THROUGH FENCES BEFORE COMING TO A STOP.

## Aircraft

- Registration: [N6494U](https://openairdocs.org/deregistered/N6494U-1990-08-17), registration cancelled 1990-08-17, S/N 2241 (OpenAirDocs)
- Reported make and model: MOONEY M20C
- Registry model: [Mooney M20C](https://openairdocs.org/model/mooney-m20c) (registry code 5870208) (OpenAirDocs)
- Category: Airplane
- Serial number: 2241
- Airframe hours: 2241
- Engines: LYCOMING IO-360-A1A 180 horsepower reciprocating
- Damage: Destroyed
- Flight: Business, Part 91
- Registered owner: Twin Falls Flyers,Inc.
- Airworthiness certificate: Standard, Normal
- Departed: BOI, BOISE, ID
- Airport: TWF, Twin Falls, runway 25, 8,703 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 46; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 201 total, 18 in this make and model, 131 as pilot in command, 14 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 15 knots, gusting 25
- Visibility: 40 statute miles
- Lowest ceiling: 25,000 ft broken
- Temperature: 70 °F, dew point 39 °F
- Altimeter: 29.00 inHg
- Observed at: TWF, 1 nm away

## 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 19860502015619A](https://openairdocs.org/incident/19860502015619A), May 2, 1986: Mooney M20C, Twin Falls, ID, Destroyed. Went off the runway side after landing. Made a go around but let the wind bank the aircraft. Stalled into a pasture.

## Other investigations on N6494U (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 OAK77FVM08](https://openairdocs.org/ntsb/OAK77FVM08), Feb 15, 1977: Mooney MK20C (N6494U), Half Moon Bay, 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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