That's kind of because the WS-15 now not the same engine as the one envisioned when the program started. Y'know, restarting an aeroengine program from scratch kinda doesn't really scream "on schedule."The WS15 project has been going on for more than 30 years, and it has not yet been successfully put into service. This is indeed pessimistic. The same is true for the WS10H
It’s pretty much in service. Just not perhaps at the production run rate they originally planned for this year (which is still *much* higher than whatever production run rate was initially expected when the program first started).The WS15 project has been going on for more than 30 years, and it has not yet been successfully put into service. This is indeed pessimistic. The same is true for the WS10H