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Accident description
Last updated: 20 November 2017
Status:Final
Date:Wednesday 3 February 1993
Time:13:27
Type:Silhouette image of generic C130 model; specific model in this crash may look slightly different
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)
Crash site elevation: 326 m (1070 feet) amsl
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:

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."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 1 months
Accident number: ATL93MA055
Download report: Summary report

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.
Add your photo of this accident or aircraft
 

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This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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