TB 55-1520-243-50-1 ULTRASONIC INSPECTION OF 540-011 SERIES MAIN ROTOR BLADES, UH-1 UH-1M, AH-1G, TH-1G AND AH-1S HELICOPTERS. TB 1-1520-243-20-25 OIL DEBRIS DETECTION SYS, CLEAN UP MSG, AH-1 & UH-1 SERIES AIRCRAFT.
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