Accident description
Last updated: 18 April 2014
Status:Final
Date:Wednesday 3 February 1993
Time:13:27 EST
Type:Lockheed L-100-20 Hercules
Operator:Lockheed
Registration: N130X
C/n / msn: 4412
First flight: 1971
Total airframe hrs:6708
Engines: 4 Allison 501-M71K
Crew:Fatalities: 7 / Occupants: 7
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 7 / Occupants: 7
Airplane damage: Destroyed
Airplane fate: Written off (damaged beyond repair)
Location:Marietta-Dobbins AFB, GA (MGE) (   United States of America) show on map
Phase: Taxi (TXI)
Nature:Test
Departure airport:Marietta-Dobbins AFB, GA (MGE/KMGE), United States of America
Destination airport:Marietta-Dobbins AFB, GA (MGE/KMGE), United States of America
Narrative:
The Lockheed engineering testbed was used to evaluate the fly-by-wire rudder actuator and the ground minimum control speed (VMCG). During the final high-speed ground test-run, the aircraft accidentally veered left and became airborne. The Hercules climbed to 250 feet and crashed.

PROBABLE CAUSE: "Disengagement of the rudder fly-by-wire flight control system resulting in a total loss of rudder control capability while conducting ground minimum control speed tests. The disengagement was a result of the inadequate design of the rudder's integrated actuator package by its manufacturer; the operator's insufficient system safety review failed to consider the consequences of the inadequate design to all operating regimes. A factor which contributed to the accident was the flight crew's lack of engineering flight test training."

Sources:
» Flight International 6-12.4.94(12)
» Air Safety Week 8.2.1993 (p. 4, 5)
» Flight International 10-16.2.93(6)
» ICAO Adrep Summary 1/95
» NTSB Safety Recommendation A-94-101
» Scramble 165


Photos

photo of Lockheed L-100-20 Hercules KAF-318
KAF-318 sold the plane to Lockheed in May 1983.
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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Marietta-Dobbins AFB, GA to Marietta-Dobbins AFB, GA as the crow flies is NAN km (NAN miles).

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