After climbing through about 13000 feet my FMC will tell me that my maximum flight level is 15800 feet (sometimes it will give me maximum flight levels round about 16000 feet). So I continue to fly but at about 15000 feet my flight simulator closes. This happens everytime I fly the pmdg 747-400. In my FMC I have entered my correct flight level which is usaully above 30,000 feet and the whole aircraft is started up following the noarmal procedures checklist.
Anybody know the nature of this problem and how it can be solved? Help would be greatly appreciated
