The Air Force has released the cause of a QRF-4 unmanned drone crash at Tyndall Air Force Base last year.
The drone, assigned to the 53rd Weapons Evaluation Group at Tyndall, crashed into the runway about 8-seconds after take-off last July, then hit a barrier and exploded.
The crash destroyed the drone, a flare-dispensing pod and 120 flares, worth a total of 4-and-a-half million dollars.
An Air Force investigation board has found the drone's Attitude Heading Reference System, which controls the aircraft's up and down movement, sent incorrect inputs to the autopilot, causing the aircraft crash.
Tthey found the system was defective. Fortunately no one was hurt, but the crash shut-down Highway 98 for 24-hours.
Tyndall uses drones as aerial targets for weapons testing and training.