# NTSB FTW94LA010: Emmert Tierra II, N246RE, Yukon, OK, October 11, 1993

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: October 11, 1993, 17:13 local (22:13 UTC)
- Place: Yukon, OK
- Location: 35.5184° N, 97.7662° W: Placed by OpenAirDocs: center of Yukon, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.5184&lon=-97.7662&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed, report August 1, 1994
- Report: Approved by Office Director
- NTSB case key (mKey): 18951
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW94LA010
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18951/pdf
- Page: https://openairdocs.org/ntsb/FTW94LA010

## Probable cause

WAS AN INADVERTENT STALL. A FACTOR WAS THE GUSTY TAILWIND.

## Sequence of events

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

- Loss of control - in flight, takeoff - initial climb
  - weather condition - gusts (contributing factor)
  - weather condition - tailwind (contributing factor)
  - stall - inadvertent, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE PILOT TOOK OFF AND WAS TURNING LEFT CROSSWIND WHEN THE AIRPLANE SUDDENLY ROLLED FURTHER TO THE LEFT AND STALLED. THE PILOT WAS RECOVERING WHEN THE AIRPLANE STRUCK THE GROUND. THE PILOT'S OPINION WAS THAT A RIGHT QUARTERING TAILWIND GUST CAUSED THE AIRPLANE TO STALL.

## Factual narrative

On October 11, 1993, approximately 1713 central daylight time, an Emmert Tierra II, N246RE, was destroyed during an uncontrolled descent shortly after taking off from Clarence E. Page Airport, Yukon, Oklahoma.  The two pilots aboard received serious injuries.  Visual meteorological conditions prevailed for the personal flight.

The following is based on the Pilot/Operator report.  The pilot had just taken off from runway 17L and was turning left onto the crosswind leg when the airplane suddenly rolled further to the left, stalled, and spun approximately 150 degrees.  The pilot was able to arrest the spin and was in the process of recovering when the airplane struck the ground.  The pilot said he thought a right quartering gust of wind caused the airplane to stall.

## Aircraft

- Registration: [N246RE](https://openairdocs.org/deregistered/N246RE-1994-06-21), registration cancelled 1994-06-21, S/N 2467E (OpenAirDocs)
- Reported make and model: EMMERT TIERRA II
- Registry model: [Emmert Raymond TIERRA II](https://openairdocs.org/model/emmert-raymond-tierra-ii) (registry code 05676MU) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 2467E
- Airframe hours: 31
- Engines: Rotax 532 UL 64 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Emmert, Raymond L.
- Registered owner: Emmert, Raymond L.
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Unknown, October 31, 1992, 14 hours before
- Departed: F29, OKLAHOMA CITY, OK
- Airport: F29, Clarence E. Page, runway 17L, 3,502 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 1,270 total, 31 in this make and model, 1,250 as pilot in command, 4 in the last 90 days, 1 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 260° at 8 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 41 °F
- Altimeter: 30.00 inHg
- Observed at: PWA, 9 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 19931011044799A](https://openairdocs.org/incident/19931011044799A), Oct 11, 1993: Amtrte TIERRA2, Oklahoma City, OK, Destroyed. Stalled in climbing left turn after takeoff. Entered spin but recovered prior to impact. Blamed wind gust.

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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