DEN06LA003

NTSB accident investigation · Aeronca 7AC · Berthoud, CO · October 9, 2005

Accident · No injuriesLimited investigationFinal report
Date
October 8, 2005, 19:20 local (Oct 9, 2005, 01:20 UTC)
Place
Berthoud, CO
Injuries
1 uninjured
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N84580Aeronca 7AC
Weather
Visual (VMC) · Day
Status
Completed · report March 28, 2006
Report
Approved by Office Director
Parties
Casper Flight Standards Field Office
FAA report
20051008026459A
Case key
62640

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

On this page

Probable cause

the pilot's improper in-flight decision making which resulted in loss of engine power due to fuel exhaustion. Contributing factors are the transmission wires and the metal pole.

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 powerCruise
Fluid,fuel - exhaustionCause
In-flight planning/decision - improperPilot in commandCause
Forced landingEmergency descent/landing
In flight collision with objectEmergency descent/landing
Object - wire,transmissionFactor
Object - poleFactor

Analysis

The Continental C-65 engine had been removed, and the airplane was equipped with a Lycoming O-235-C1 engine, rated at 115 horsepower at 2,600 rpm. According to the pilot, he filled his fuel tanks (13 gallons each wing) and took off. He made four touch-and-go landings at his private airstrip, then flew north "to see the aspens." On the return leg, the engine "sputtered." He enriched the mixture and the engine ran smoothly. Shortly thereafter, the engine sputtered again. The fuel gauges indicated between 1/4 and 1/2 full. He rocked the wings and the engine ran smoothly again. Finally, after flying for 2-1/2 hours, the engine completely lost power. Unable to reach his airstrip, the pilot elected to land on a county road. The airplane struck telephone wires and a steel post alongside the road, tearing off the left wing. The pilot told a sheriff's deputy that he ran out of fuel. According to the salvage crew that retrieved the airplane, they drained 2-1/2 gallons of fuel from the right tank. The pilot said there should have been another 2-1/2 gallons of fuel in the left tank. The engine was later functionally tested to full power.

Factual narrative

On October 8, 2005, approximately 1920 mountain daylight time, an Aeronca 7AC, N84580, operated and piloted by a private pilot, was destroyed when it struck telephone lines and impacted terrain following a loss of engine power near Berthoud, Colorado. Visual meteorological conditions prevailed at the time of the accident. The local personal flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The pilot sustained no injuries. The flight originated from a private airstrip near Berthoud approximately 1700.

The Continental C-65 engine had been removed, and the airplane was equipped with a Lycoming O-235-C1 engine, rated at 115 horsepower at 2,600 rpm. According to the pilot, he filled his fuel tanks (13 gallons each wing) and took off. He made four touch-and-go landings at his airstrip, then flew north to the Laramie, Wyoming, area "to see the aspens." On his return leg as he approached the Red Feathers Lakes area, the engine "sputtered." He enriched the mixture and the engine ran smoothly. As he approached Longmont, Colorado, the engine sputtered again. He said the fuel gauges indicated between 1/4 and 1/2 full. He rocked the wings and the engine ran smoothly again. As he approached Berthoud, the engine lost power. The pilot said he had been aloft for 2-1/2 hours. Unable to reach his airstrip, the pilot elected to land on Road 23E, just south of Road 4 in Larimer County. The airplane struck telephone wires and a steel post alongside the road, tearing off the left wing. The pilot told a Larimer County sheriff's deputy that he ran out of fuel. According to the salvage crew that retrieved the airplane, they drained 2-1/2 gallons of fuel from the right tank. The pilot said there should have been another 2-1/2 gallons of fuel in the left tank.

On November 17, 2005, the engine (s/n 2024-15) was functionally tested at the facilities of Beegles Aircraft Service in Greeley, Colorado. Prior to the test, it was noted that the gascolator was empty. A maximum of 2,200 rpm was achieved, and there was a 75 rpm drop when each magneto was tested. Fuel flowed normally from the forward wing supply line, but would not flow from the aft supply line. Examination disclosed that the aft supply line was pinched inside the fuselage in an area of impact damage.

Aircraft

Registration
N84580
Reported as
Aeronca 7AC
Category
Airplane
Serial number
5494768
Engine
Lycoming O-235-C1, 100 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Registered owner
Masonville Trucking
Airworthiness certificate
Standard, Normal
Departed
Berthoud, CO
Destination
Berthoud, CO

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
52
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Last flight review
October 1, 2003
Seat
Front
Flight hours
22 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
20° at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
66 °F, dew point 30 °F
Altimeter
29.67 inHg
Observed at
FNL

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 N84580 · 1

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