Prompted By Discovery Of A Crack On A Main Rotor Blade
The FAA has issued an Emergency AD (2015-20-51) for Model UH-12-series helicopters, with a main rotor blade (MRB) fork, part number 52110-3, with a serial number 11502P through 11537P, or 11551P through 11579P, excluding 11577P, certificated in any category.