Hi, I have used pmdg737 version for a while, recently got the pmdg 747 version and upgraded it to latest patch.However, now 737 version is crashing fs9. Any ideas??Mark

Hi Mark,If things crash "out of the blue", re-installing the aircraft is the best and easiest solution. Doing that often cures weird gremlins that somehow creep into your system.Cheers,Bryan

You were right ! everything now working, however can you explain when to use the improved climb option on the departure briefing page. I couldnt find an explanation in the manual. I know the bleeds may need to be switched off at high altitude, but the climb option has me confused.Regards,Mark

It's just a bleeds-off takeoff for improved takeoff/climb performance.Cheers,Bryan