Pratt & Whitney 发动机 PW1519G PW1521G PW1521G-3 PW1521GA PW1524G PW1524G-3 PW1525G PW1525G-3 PW1919G PW1921G PW1922G PW1923G PW1923G-A PW4077D PW4084D PW4090 PW4164 PW4164-1D PW4164C PW4164C-1D PW4164C-B PW4168 PW4168-1D PW4168A PW4168A-1D PW4170