CEN13CA315

NTSB accident investigation · Cub Crafters CCK · Cookson, OK · June 3, 2013

Accident · No injuriesData collectionFinal report
Date
June 3, 2013, 13:00 local (18:00 UTC)
Place
Cookson, OK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N319MACub Crafters CCK
Defining event
Approach-VFR pattern final: Fuel contamination
Weather
Visual (VMC) · Day
Status
Completed · report July 23, 2013
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Flight Standards District Office
FAA report
20130603010489A
Case key
87090

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

A total loss of engine power due to water contamination in the fuel. Contributing to the accident was the pilot's failure to check the fuel during the preflight, and failure to check the fuel storage tank’s fuel filter/water separator.

Findings · 4

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.

Fluids: fuelAircraft › Fluids/misc hardware · Fluid conditionDennis Stephen CUB CRAFTERS INC CCK: 1 caseAll aircraft: 1,695 casesProbable cause
Fuel system: fuel storageAircraft › Aircraft systems · Not inspectedDennis Stephen CUB CRAFTERS INC CCK: 1 caseAll aircraft: 60 casesProbable cause
Fluids: fuelAircraft › Fluids/misc hardware · Inadequate inspectionDennis Stephen CUB CRAFTERS INC CCK: 1 caseAll aircraft: 1,695 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 engine lost power during the approach for landing and the restart attempt was unsuccessful. The pilot attempted to make a forced landing on a narrow gravel road. The left wing struck the top of a tree; the airplane spun around and impacted the ground. The wings received substantial damage. Post-accident examination revealed water in the fuel, in the carburetor, and in the storage supply tank. The pilot surmised that the water was likely due to recent heavy rain showers. He admitted he failed to check the fuel when he preflighted the airplane, and overlooked checking the fuel storage tank’s fuel filter/water separator.

Factual narrative

The pilot reported that as he made a teardrop turn towards the airport, the engine lost power. Shortly thereafter, it resumed developing power. The engine lost power and resumed developing power on two more occasions. The engine lost power a fourth time but did not regain power. The pilot switched the fuel selector from both tanks to one tank, and turned on the backup ignition. The engine would not resume operation. The pilot realized he did not have enough airspeed or altitude to glide to the runway so elected to make a forced landing on a narrow gravel road. As he approached the road, the left wing struck the top of a tree, spinning the airplane around. The pilot said the airplane made a hard impact with the ground. The left wing leading edge sustained compression damage, and the main landing gear was spread apart. Post-accident examination revealed water in the fuel. The carburetor was opened and a “substantial” amount of water was drained. Water was also found in the pilot's fuel storage tank. The pilot surmised that the water was likely due to recent heavy rain showers. The pilot admitted he failed to check the fuel when he preflighted the airplane, and he overlooked checking the fuel storage tank’s fuel filter/water separator.

Aircraft

Registration
N319MA
Reported as
Cub Crafters CCK
Category
Airplane, amateur-built
Serial number
CCK-1865-0019
Airframe hours
62
Engine
Cub Crafters CC340, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Dennis R. Stephen
Registered owner
Dennis R. Stephen
Airworthiness certificate
Special, Experimental light sport (Special)
Last inspection
Condition · December 22, 2012 · 62 hours before
Departed
44M · Cookson, OK
Destination
44M · Cookson, OK
Airport
44M · Tenkiller Lake, runway 05, 2,600 × 75 ft, grass/turf

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
68
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
February 1, 2013
Seat
Front
Flight hours
2,000 total · 62 in this make and model · 24 in the last 90 days · 8 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
77 °F, dew point 57 °F
Altimeter
29.96 inHg
Observed at
KTQH, 14 nm away

Docket · 2

The files NTSB released with the investigation on June 14, 2013, on NTSB’s docket system: statements, records, photos and specialists’ reports. 405 KB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.