FAA has issued airworthiness directive 2021-14-06 for all Pratt & Whitney PW1519Gs, PW1521Gs, PW1521G-3s, PW1521GAs, PW1524Gs, PW1524G-3s, PW1525Gs, PW1525G-3s, PW1919Gs, PW1921Gs, PW1922Gs, PW1923Gs and PW1923G-As, requiring initial and repetitive borescope inspections of low-pressure compressor rotor 1 and, depending on the results, replacement of the compressor, removal from service of certain electronic engine control full authority digital electronic control software and installation of a software version eligible for installation, and inspection after installation of the updated software if certain onboard maintenance message fault codes are displayed and meet specified criteria, effective Aug. 12, 2021.