and brownout conditions have contributed to the vast majority of them, . The dangerous visibility restriction that occurs due to dust or sand being thrown into the air due to rotor downwash interacting with sediment or sand on the ground during takeoff and landing leaves a pilot unable to see nearby objects and outside visual references. These references are used to control the aircraft and judge the helicopters position near the ground (Key, 1999). Loss of these visual references leads to spatial…
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