DEN06LA099

NTSB accident investigation · Aeronca 7AC · Parker, CO · July 15, 2006

Accident · Serious injuriesLimited investigationFinal report
Date
July 15, 2006, 07:50 local (13:50 UTC)
Place
Parker, CO
Injuries
2 serious
Damage
Destroyed
Phase of flight
Initial climb
Aircraft
N85086Aeronca 7AC
Weather
Visual (VMC) · Day
Status
Completed · report January 31, 2007
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20060715014389A
Case key
64127

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 flight instructor's failure to maintain airspeed while maneuvering resulting in an inadvertent stall and subsequent impact with terrain. Contributing factors were the high density altitude, rising terrain, and improper in-flight planning.

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 - in flightTakeoff - initial climb
Weather condition - high density altitudeFactor
In-flight planning/decision - improperPilot in command(cfi)Factor
Terrain condition - risingFactor
Remedial action - attemptedPilot in command(cfi)
Airspeed - not maintainedPilot in command(cfi)Cause
Stall - inadvertentPilot in command(cfi)
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - ground

Analysis

Prior to takeoff, the flight instructor and student discussed the direction of takeoff before the flight, and they elected to takeoff on runway 22, since the tailwind component was too strong for runway 4. They also discussed "a go/no go location on the strip where [they] would abort if not off the ground by that point." The instructor reported "the run-up was normal and everything seemed in order." The takeoff was normal and the airplane was airborne before the decision point. The airplane was "climbing out upslope, everything seemed normal as the student flew, until he said he might need some help." The instructor reported the airplane had stopped climbing and "the ridge was getting closer." Subsequently, they attempted a shallow bank at a direction 90 degrees from their original course. At that point, " the left wing dipped and we lost control." The instructor reported "we were slow and not very high, so there was not much momentum built up before we struck first the left wing tip, followed by the right wing and airplane." He also reported the engine had been operating normally throughout the flight, and there were no anomalies noted with the handling of the airplane. The calculated density altitude near the airport at the time of the accident was 8,675 feet.

Factual narrative

On July 15, 2006, approximately 0750 mountain daylight time, an Aeronca 7AC single-engine airplane, N85086, was destroyed when it impacted terrain following a loss of control during initial takeoff climb from Everitt Airport (1CO8), Parker, Colorado. The flight instructor and student sustained serious injuries. The airplane was registered to and operated by a private individual. Visual meteorological conditions prevailed, and a flight plan was not filed for the Title 14 Code of Federal Regulations Part 91 instructional flight. The local flight was originating at the time of the accident.

According to the flight instructor and student, they discussed the direction of take-off before the flight and elected to take-off on runway 22, since the tailwind component was too strong for runway 4. They also discussed "a go/no go location on the strip [where] we would abort if not off the ground by that point." The instructor reported "the run-up was normal and everything seemed in order." The take-off was normal and the airplane was airborne before the decision point. They stated the airplane was "climbing out upslope, everything seemed normal as the student flew, until he said he might need some help." The instructor reported the airplane had stopped climbing and "the ridge was getting closer." Subsequently, they attempted a shallow bank at a direction 90 degrees from their original course. At that point, " the left wing dipped and we lost control." The instructor reported "we were slow and not very high, so there was not much momentum built up before we struck first the left wing tip, followed by the right wing and airplane." He also reported the engine had been operating normally throughout the flight, and there were no anomalies noted with the handling of the airplane.

At 0753, the Centennial Airport (APA), Denver, Colorado, automated surface observing system (ASOS), located approximately 15 miles northwest of the accident site, reported the wind from 220 degrees at 11 knots, few clouds at 12,000 feet, temperature 26 degrees Celsius, dew point 6 degrees Celsius, and an altimeter setting of 30.30 degrees. The calculated density altitude at APA was 8,675 feet.

Examination of the airplane, conducted by a Federal Aviation Administration inspector, revealed the forward fuselage was crushed up and aft. The leading edges of both wings were crushed aft. The engine was partially separated from the airframe, and both propeller blades were bent aft. Flight control continuity was established to all flight control surfaces.

Aircraft

Registration
N85086
Reported as
Aeronca 7AC
Category
Airplane
Serial number
7AC-3815
Airframe hours
3,297
Engine
Continental A65-8F, 65 horsepower, reciprocating
Damage
Destroyed
Flight
Instructional · Part 91
Registered owner
Sandra J. Whelchel
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 1, 2005 · 44 hours before
Departed
1CO8 · Parker, CO
Destination
1CO8 · Parker, CO
Airport
1CO8 · Everitt, runway 22, 2,200 × 100 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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Flight instructor
Age
51
Injuries
Serious
Certificates
Flight instructor, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
October 1, 2004
Seat
Rear
Flight hours
2,821 total · 52 in this make and model · 2,762 as pilot in command · 30 in the last 90 days · 9 in the last 30 days
Role
Student pilot
Age
32
Injuries
Serious
Certificate
Student
Medical
Class 3, With waivers/limitations
Seat
Front
Flight hours
46 total · 44 in this make and model · 12 in the last 90 days · 4 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
220° at 11 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 43 °F
Altimeter
30.29 inHg
Observed at
APA, 10 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.