# NTSB ATL86FEK02: Green Pietenpol, N899MG, Mt. Vernon, OH, May 31, 1986

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: May 31, 1986, 18:00 local (22:00 UTC)
- Place: Mt. Vernon, OH
- Coordinates: 40.390544, -82.469345 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.3905&lon=-82.4693&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 6981
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL86FEK02
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/6981/pdf
- Page: https://openairdocs.org/ntsb/ATL86FEK02

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - mech failure/malf, takeoff - initial climb
  - operation with known deficiencies in equipment - intentional, pilot in command (contributing factor)
  - fuel system,carburetor - incorrect (cause)
  - mixture - improper (cause)
  - flight/nav instruments,airspeed indicator - false indication (contributing factor)
- Loss of control - in flight, descent - emergency
  - airspeed - not possible, pilot in command (cause)
  - stall/spin
- In flight collision with terrain/water, descent - 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](https://openairdocs.org/deregistered/N899MG-2013-06-18), registration cancelled 2013-06-18, S/N 285-40-5574, built 1985 (OpenAirDocs)
- Reported make and model: GREEN PIETENPOL
- Registry model: [Green Melvin A PIETENPOL AC-1](https://openairdocs.org/model/green-melvin-a-pietenpol-ac-1) (registry code 7040396) (OpenAirDocs)
- Registry engine: [Ford CONVERSION](https://openairdocs.org/engine/ford-conversion) (registry code 26701, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 1
- Engines: 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

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; 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 (OpenAirDocs).

- [Accident 19860531020269A](https://openairdocs.org/incident/19860531020269A), May 31, 1986: Amtrpl AIRCAMPER, Mount Vernon, OH, Substantial damage. Pitot tube not extended FAR enough forward of wing leading edge. Gave low airspeed reading. Spun to ground impact.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.