ATL86FEK02

NTSB accident investigation · Green Pietenpol · Mt. Vernon, OH · May 31, 1986

Accident · Serious injuriesFinal report
Date
May 31, 1986, 18:00 local (22:00 UTC)
Place
Mt. Vernon, OH
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N899MGGreen Pietenpol
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19860531020269A
Case key
6981

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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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(partial) - mech failure/malfTakeoff - initial climb
Operation with known deficiencies in equipment - intentionalPilot in commandFactor
Fuel system,carburetor - incorrectCause
Mixture - improperCause
Flight/nav instruments,airspeed indicator - false indicationFactor
Loss of control - in flightDescent - emergency
Airspeed - not possiblePilot in commandCause
Stall/spin
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The acft stalled and entered a spin to ground impact during the initial takeoff climb. The plt reported that during the takeoff and climb the airspeed indicator did not exceed 40 mph. He also stated the acft did not appear to be traveling very fast. He then initiated a rudder turn back toward the arpt. After the turn the acft entered the stall. Post accident inspection disclosed the two front exhaust stacks and spark plugs were covered with black soot. The #3 cylinderspark plug and plug gasket were also soot covered. The plt reported black smoke was emitted from the exhaust stacks during high speed taxi runs just prior to this takeoff. The pitot system was not blocked and the pitot tube extended 1 1/2 to 2 inches from the center of the wing leading edge radius.

Aircraft

Registration
N899MG
Reported as
Green Pietenpol
Category
Airplane, amateur-built
Serial number
1
Engine
Ford MODEL A, 50 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Melvin A. Green
Airworthiness certificate
Special, Experimental (Special)
Departed
6G4 · Mount Vernon, OH

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
40
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Rear
Flight hours
122 total · 1 in this make and model · 88 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
310° at 4 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point -0 °F
Altimeter
29.00 inHg
Observed at
CMH, 32 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.