ATL91LA113

NTSB accident investigation · Rockwell S-2R · Camilla, GA · June 17, 1991

Accident · No injuriesLimited investigationFinal report
Date
June 17, 1991, 08:30 local (12:30 UTC)
Place
Camilla, GA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N8549VRockwell S-2R
Weather
Visual (VMC) · Day
Status
Completed · report March 31, 1993
Report
Approved by Office Director
FAA report
19910617022189A
Case key
8421

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

Restricted exhaust valve movement, low cylinder compression, and fouling of the engine spark plugs, which resulted in the loss of engine power. Factors were the improper servicing of the aircraft, and the use of an improper fuel grade.

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 engine power(total) - mech failure/malfTakeoff - initial climb
Maintenance,service of aircraft/equipment - improperCompany/operator managementFactor
Fluid,fuel grade - improperFactor
Engine assembly,valve,exhaust - movement restrictedCause
Engine assembly,cylinder - low compressionCause
Ignition system,spark plug - fouledCause
Forced landingDescent - emergency
In flight collision with terrain/waterDescent - emergency
Object - tree(s)

Analysis

The pilot reported that shortly after takeoff, the engine shuddered violently, then quit. The airplane was force landed straight ahead, and was substantially damaged by the ensuing collision with trees. Post-crash inspection of the engine revealed that the spark plugs were badly carbon fouled. No compression was observed on the number one cylinder, and compression on the remaining cylinders was only 'fair.' Disassembly of the number one cylinder revealed that the exhaust valve and seat were partially burned. A hammer was required to remove the valve from the cylinder. The piston was badly carboned. A mechanic reported that the operator was using automotive gasoline in this airplane, without an STC for its use.

Aircraft

Registration
N8549V
Reported as
Rockwell S-2R
Category
Airplane
Serial number
2309
Airframe hours
4,464
Engine
P&W R-1340-AN1, 550 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Maxwell Aviation, Inc.
Registered owner
Maxwell Aviation, Inc.
Last inspection
Annual · July 18, 1990 · 273 hours before
Airport
CXU · Mitchell County, runway 8, 4,005 × 60 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
57
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter
Medical
Class 2, Unknown
Flight hours
12,000 total · 5,000 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
220° at 4 knots
Visibility
6 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 70 °F
Altimeter
29.00 inHg
Observed at
ABY, 20 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.