LAX08LA263

NTSB accident investigation · Smith Stewart S51D · Oxnard, CA · August 9, 2008

Accident · Serious injuriesLimited investigationFinal report
Date
August 9, 2008, 15:14 local (22:14 UTC)
Place
Oxnard, CA
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N51VSSmith Stewart S51D
Defining event
Approach-VFR pattern final: Loss of engine power (partial)
Weather
Visual (VMC) · Day
Status
Completed · report May 12, 2009
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20080809845539A
Case key
68664

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The loss of engine power for an undetermined reason.

Findings · 2

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

AircraftAircraft › Aircraft power plant · FailureSmith Owen I STEWART S51D: 1 caseAll aircraft: 151 casesProbable cause
Not determinedNot determined › Not determined · Unknown/Not determinedSmith Owen I STEWART S51D: 1 caseAll aircraft: 2,247 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reported that the flight was made at a cruise altitude of 9,500 feet mean sea level (msl). As he neared his destination, he descended to 2,500 feet msl at low power with the mixture enrichened progressively. He entered the traffic pattern for runway 25 on the right base leg as instructed by the tower local controller. After turning final, the pilot increased power and the engine began to run rough. According to the pilot, "the engine was producing little or no power and descent rate was in excess of 2,500 feet per minute." He switched from the right to the left ignition module, which resulted in a momentary increase in power. After a few seconds, the engine again stopped producing power, and he executed an approach to a baseball field. The airplane impacted the chain link fence backstop of the baseball field and then struck a school bus barn. The wing separated from the fuselage. A Federal Aviation Administration inspector examined the wreckage of the airplane and reported that the airplane was powered by a Chevrolet V-8 engine. The reason for the loss of engine power was not determined.

Factual narrative

On August 9, 2008, about 1514 Pacific daylight time, a Smith Stewart S51D, amateur built experimental airplane, N51VS, experienced a loss of engine power while on approach to land at Oxnard Airport, Oxnard, California. During the subsequent forced landing, the airplane sustained substantial damage when it collided with a fence and building. The private pilot, who was the owner and builder of the airplane, received serious injuries. Visual meteorological conditions prevailed for the 14 Code of Federal Regulations Part 91 personal cross-country flight, and no flight plan was filed. The flight departed from Tehachapi, California, at 1415, with an intended destination of Oxnard.

The pilot reported that the flight was made at a cruise altitude of 9,500 feet mean sea level (msl). As he neared his destination, he descended to 2,500 feet msl at low power with the mixture enrichened progressively. He entered the traffic pattern for runway 25 on the right base leg as instructed by the tower local controller. After turning final, the pilot increased power and the engine began to run rough. According to the pilot, "the engine was producing little or no power and descent rate was in excess of 2,500 feet per minute." He switched from the right to the left ignition module, which resulted in a momentary increase in power. After a few seconds, the engine again stopped producing power, and he executed an approach to a baseball field.

Oxnard Fire Department personnel reported that the airplane impacted the chain link fence backstop of the baseball field and then struck a school bus barn. The wing separated from the fuselage and fuel was observed leaking from the wing.

A Federal Aviation Administration inspector examined the wreckage of the airplane and reported that the airplane was powered by a Chevrolet V-8 engine. The reason for the loss of engine power was not determined.

Aircraft

Registration
N51VS
Reported as
Smith Stewart S51D
Category
Airplane, amateur-built
Serial number
162
Airframe hours
125
Engine
Chevrolet V-8, 495 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · April 5, 2008
Departed
TSP · Tehachapi, CA
Destination
OXR · Oxnard, CA
Airport
OXR · Oxnard, runway 25, 5,953 × 100 ft, asphalt

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
62
Injuries
Serious
Certificate
Private
Airplane ratings
Multi-engine land, Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
June 28, 2007
Seat
Front
Flight hours
2,400 total · 130 in this make and model · 2,350 as pilot in command · 33 in the last 90 days · 7 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
250° at 11 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
70 °F, dew point 57 °F
Altimeter
29.95 inHg
Observed at
OXR, 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.

Other investigations on N51VS · 1

Matched to the same aircraft by N-number and date.