Date: | Wednesday 3 February 1993 |
Time: | 13:27 |
Type: | Lockheed L-100-20 Hercules |
Owner/operator: | Lockheed |
Registration: | N130X |
MSN: | 4412 |
Year of manufacture: | 1971 |
Total airframe hrs: | 6708 hours |
Engine model: | Allison 501-M71K |
Fatalities: | Fatalities: 7 / Occupants: 7 |
Aircraft damage: | Destroyed, written off |
Category: | Accident |
Location: | Marietta-Dobbins AFB, GA (MGE) -
United States of America
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Phase: | Taxi |
Nature: | Test |
Departure airport: | Marietta-Dobbins AFB, GA (MGE/KMGE) |
Destination airport: | Marietta-Dobbins AFB, GA (MGE/KMGE) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
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."
Accident investigation:
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Investigating agency: | NTSB |
Report number: | ATL93MA055 |
Status: | Investigation completed |
Duration: | 1 year 1 month |
Download report: | Final report |
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Sources:
Flight International 6-12 April 1994 (12)
Air Safety Week 8 February 1993 (p. 4, 5)
Flight International 10-16 February 1993 (6)
ICAO Adrep Summary 1/95
NTSB Safety Recommendation A-94-101
Scramble 165
Location
Images:
photo (c) via Werner Fischdick; Cambridge Airport (CBG); March 1976
Revision history:
Date/time | Contributor | Updates |