# NTSB Accident ATL93MA055
> **LOCKHEED L382E-44K-20** · 1993-02-03 · MARIETTA, GA, USA · FATL
## Event
- **NTSB number:** ATL93MA055
- **Event ID:** 20001211X11781
- **Type:** Accident
- **Date:** 1993-02-03
- **Location:** MARIETTA, GA, USA
## Injuries
- **Highest injury:** FATL
- **Fatal:** 7
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 7
## Aircraft
- **Make:** LOCKHEED
- **Model:** L382E-44K-20
- **Registration:** N130X
- **FAR Part:** 091
- **Engines:** 4
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## 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.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ATL93MA055) · AI Analytics · CC0 1.0*