# NTSB DEN07IA144: Nunn KR2, N996P, Pueblo, CO, August 24, 2007

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: August 24, 2007, 14:22 local (20:22 UTC)
- Place: Pueblo, CO
- Coordinates: 38.289165, -104.496391
- Nearby events: https://openairdocs.org/map.md?lat=38.2892&lon=-104.4964&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 29, 2007
- Report: Approved by Office Director
- Parties: FAA Flight Standards District Office
- NTSB case key (mKey): 66512
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN07IA144
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/66512/pdf
- Page: https://openairdocs.org/ntsb/DEN07IA144

## Probable cause

The pilot's failure to maintain directional control and his inadequate compensation for wind conditions .  A contributing factor in this accident was the crosswind.

## Sequence of events

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

- On ground/water encounter with weather, takeoff
  - weather condition - crosswind (contributing factor)
- Loss of control - on ground/water, takeoff
  - directional control - not maintained, pilot in command (cause)
  - compensation for wind conditions - inadequate, pilot in command (cause)
  - aircraft performance,crosswind capability - exceeded
- On ground/water encounter with terrain/water, takeoff
  - terrain condition - runway

## Analysis

The pilot was taking off on runway 08L.  The reported wind was from 140 degrees at 10 knots, with gusts to 15 knots.  He encountered a crosswind and the airplane went off the left side of the runway.  The pilot was asked for the airplane's maximum crosswind component.  He said he didn't know because this was an amateur-built airplane with a special airworthiness certificate in the experimental category.  His airplane has a gross weight of  1,000 pounds.  By comparison, a Cessna 152, according to the Cessna Aircraft Company, has a gross weight of 1,670 pounds and a maximum crosswind component of 12 knots.

## Factual narrative

The pilot was taking off on runway 08L.  The reported wind was from 140 degrees at 10 knots, with gusts to 15 knots.  He encountered a crosswind and the airplane went off the left side of the runway.  The propeller was shattered, the right wheel was sheared off the landing gear, and the left wing tip was scraped.

The pilot was asked for the airplane's maximum crosswind component.  The pilot said he didn't know because this was an amateur-built airplane with a special airworthiness certificate in the experimental category.  His airplane has a gross weight of  1,000 pounds.  By comparison, a Cessna 152, according to the Cessna Aircraft Company, has a gross weight of 1,670 pounds and a maximum crosswind component of 12 knots.

## Aircraft

- Registration: N996P (not matched to a registry record)
- Reported make and model: Nunn KR2
- Category: Airplane, amateur-built
- Serial number: KR 2801
- Airframe hours: 26
- Engines: Chevrolot Corvair 84 horsepower reciprocating
- Damage: Minor damage
- Flight: Flight test, Part 91
- Registered owner: Paul R. Nunn
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Condition, May 1, 2007
- Departed: PUB, Pueblo, CO
- Destination: PUB
- Airport: PUB, Peublo Memorial, runway 09L, 10,496 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 62; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review August 1, 2007; seat: single; flight hours: 3,170 total, 26 in this make and model, 3,031 as pilot in command, 13 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 140° at 10 knots, gusting 15
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 81 °F, dew point 55 °F
- Altimeter: 29.97 inHg
- Observed at: PUB

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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