F-35s cleared to resume flight

F-35 Lightning IIs were cleared for flight Feb. 28 following a temporary suspension after a cracked engine blade was found in a test aircraft earlier in the month. After the crack was found, all F-35 engines were inspected and no additional cracks or signs of similar engine stress were found. A thorough series of tests on the blade concluded prolonged exposure to high-heat levels and other operational stressors on the engine were contributing factors. Today F-35s cleared to resume flight...