# NTSB LAX06CA090: Quicksilver MX II Sprint, Bouse, AZ, January 14, 2006

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Data collection · Final report
- Date: January 14, 2006, 09:36 local (16:36 UTC)
- Place: Bouse, AZ
- Coordinates: 33.931388, -113.995834
- Nearby events: https://openairdocs.org/map.md?lat=33.9314&lon=-113.9958&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 minor
- Status: Completed, report May 30, 2006
- Report: Approved by Office Director
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 63108
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX06CA090
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/63108/pdf
- Page: https://openairdocs.org/ntsb/LAX06CA090

## Probable cause

Loss of engine power after takeoff due to engine overheating and piston seizure.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, approach - vfr pattern - downwind
  - engine assembly,piston - overtemperature (cause)
  - engine assembly,piston - seized (cause)
- Forced landing, emergency descent/landing
- In flight collision with object, emergency descent/landing
  - object - tree(s)

## Analysis

An unregistered two seat ultralight airplane experienced a loss of engine power and impacted a tree.  The airplane took off and entered a downwind leg for the airstrip about 200 feet above ground level (agl).  When the airplane was about midfield on the downwind, the engine lost power.  The aircraft descended and impacted a tree nose first.   Examination of the engine revealed indications of over temperature and seizure of the left piston.

## Factual narrative

On January 14, 2006, about 0936 mountain standard time, an unregistered Quicksilver MX II Sprint airplane collided with a tree near Bouse, Arizona, following a loss of engine power.  The pilot/owner was operating the airplane under the provisions of 14 CFR Part 91.  The private pilot was seriously injured; the airplane was substantially damaged.  The local personal flight departed Bouse airstrip at an unknown time.  Visual meteorological conditions prevailed, and no flight plan had been filed.  The approximate global positioning system (GPS) coordinates of the primary wreckage were 33 degrees 56 minutes north latitude and 114 degrees 0 minutes west longitude.

An eyewitness stated that the airplane took off and entered a downwind leg at about 200 foot above ground level (agl).  Halfway down the downwind leg, the engine quit.  The aircraft descended and impacted a tree nose first.

A mechanic experienced with ultralight type two-stroke engines (not a licensed Airframe and Powerplant Mechanic) examined the engine from the accident airplane.  The mechanic reported that the engine could be rotated by hand, and he measured compression in the left cylinder as 115 psi and 145 psi in the right cylinder.  He said that 145 psi would be considered a normal cylinder compression reading.  The left cylinder had aluminum stuck to the inside of the cylinder wall on both the intake side and exhaust side.  The sparkplug electrodes were light gray or almost white in color, and carbon deposits or buildup was observed on both.  The piston domes did not have a good wash pattern and had carbon buildup on the faces.  The air filter was barely serviceable.  There was oil residue around the exhaust port.  The mechanic said that the aluminum deposits inside the left cylinder indicates that the piston seized, probably from overheating, which stopped the engine.

## Aircraft

- Registration: UNREG (not matched to a registry record)
- Reported make and model: Quicksilver MX II Sprint
- Category: Airplane, amateur-built
- Serial number: Unknown
- Engines: Rotax 503 reciprocating
- Damage: Minor damage
- Flight: Personal, Part 91
- Registered owner: Otis E Hopkins
- Airworthiness certificate: Special, Experimental (Special)
- Departed: Bouse, AZ
- Destination: Bouse, AZ
- Airport: NONE, Bouse, runway 35, 2,000 × 60 ft, gravel

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 73; injuries: serious; flight hours: 0 total, 0 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 59 °F, dew point 23 °F
- Altimeter: 29.95 inHg
- Observed at: KHII, 40 nm away

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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