LAX99LA312

NTSB accident investigation · Rockwell S-2R · Acampo, CA · September 19, 1999

Accident · Minor injuriesLimited investigationFinal report
Date
September 19, 1999, 16:56 local (23:56 UTC)
Place
Acampo, CA
Injuries
1 minor
Damage
Destroyed
Phase of flight
Takeoff
Aircraft
N4168XRockwell S-2R
Weather
Visual (VMC) · Day
Status
Completed · report April 6, 2001
Report
Approved by Office Director
FAA report
19990919027809A
Case key
47433

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 pilot's failure to maintain runway alignment, which resulted in the aircraft encountering high vegetation, the loss of directional control, and collision with trees.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of control - on ground/waterTakeoff - roll/run
Terrain condition - high vegetation
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Proper alignment - not maintainedPilot in commandCause
In flight collision with objectTakeoff - initial climb
Object - tree(s)
Directional control - not maintainedPilot in command

Analysis

The private dirt strip is the size of a single lane road with vegetation, approximately 2 - 3 feet tall, and small trees on either side. On the takeoff roll, the left wheel and spreader became entangled in tall vegetation, which slewed the airplane to the left. The airplane became airborne and the left wing struck two trees.

Factual narrative

On September 19, 1999, at 1656 hours Pacific daylight time, a Rockwell S-2R, N4168X, collided with trees during takeoff from a private dirt airstrip near Acampo, California. The airplane, operated under the provisions of 14 CFR Part 91, was destroyed in a postimpact fire. The commercial pilot received minor injuries. Visual meteorological conditions existed for the local positioning flight, and no flight plan was filed. The flight was scheduled to terminate at the Lodi Airport, Lodi, California

An on-scene investigation by a Federal Aviation Administration (FAA) inspector revealed that the airstrip is approximately the size of a single lane road. Grass, shrubs, and weeds approximately 2- to 3-feet tall, are located on both sides of the runway, with a series of trees that run along a railroad track on the left side of the runway. The inspector reported that the aircraft and engine logbooks, located onboard the airplane, were destroyed by a postimpact fire.

The pilot stated in an interview with the FAA that he was moving his airplane to the Lodi airport because of the pending closure of the airstrip.

The pilot stated that on the takeoff roll the left main wheel and the spreader got caught on the vegetation. This slewed the airplane to the left and then the left wing end cap struck a small tree. Before the pilot could recover directional control, the left wing struck a second tree. He stated that approximately 3 feet of the left wing was torn from the airplane, which then pitched up, turned 180 degrees, and impacted railroad tracks approximately 40 yards from the second tree. The pilot stated that the airplane had not flown since January, but the engine was started every couple of weeks to keep it lubricated.

Witnesses to the accident stated that during the run-up no discrepancies were noted with the engine. They further reported that through the takeoff and accident sequence the engine sounded as if it was producing full power. Witnesses reported that during the takeoff roll the wings were level and it appeared that the spreader had become caught in the weeds. After the accident they assisted the pilot out of the airplane and noted smoke coming from the engine nacelle. They stated that there was an ensuing fire that spread from the engine nacelle downward and then up into the cockpit.

The pilot did not complete the NTSB Form 6120.1/2, Pilot/Operator Aircraft Accident Report, despite repeated attempts by Safety Board investigators to obtain the information.

Aircraft

Registration
N4168X
Reported as
Rockwell S-2R
Category
Airplane
Serial number
1937R
Engine
P&W R1340, 600 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Positioning · Part 91
Registered owner
William E. Chapman
Airworthiness certificate
Special, Restricted (Special)
Destination
1O3 · Lodi, CA
Airport
Pvt Dirt Airstrip

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
61
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Center
Flight hours
16,200 total

Weather

Conditions
Visual (VMC) · Day
Wind
330° at 11 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
77 °F, dew point 57 °F
Altimeter
29.00 inHg
Observed at
SKC, 40 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 N4168X · 1

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