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747 authrottle fmc max alt message

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hey guys got a problem with pmdg fs9 747.i get a fmc message max 134 or sumtime like dat every 5 minutes. the autothrottle also disconnects and thevaircraft loses like 30knots. this happens every five minutes which makes d plane un flayable.when i check the vnav page on d fmc it says for example opt alt fl290 ,max alt fl330 but i willl get a fmc message sayin max alt 143 example followed by autothrottle disconnect and speed loss. it even happens when the joystick is disconnected. and i also select the option from d pmdg menu whichs control overide A/T. dont know wot else to do please help if u cancheers jarga

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