Hello all,using the PMDG B747-400 in FS9 I try to understand the FMC.But some topics in the FMC main menue are not described in the manual: SAT-M SAT-S ACMS CMCThese keys are not simulated, but I'm interesting what functions are this in a real cockpit?Because every arline can modify the FMC menue I think these display may belong to a specific airline company?Thank you in advance for answers.FlugFan

Hi,I checked the 747-400 AOM:SAT-M/SAT-S : Satellite communication systemACMS : Airplane Condition Monitoring SystemCMC : Central Maintenance Computer

Hallo Egbert,thank you for this information.Can you see the difference between "SAT-M" and "SAT-S" in the B747 AOM amd tell me shortly the function of satellite communication system?Is this for communication between pilots and airlane or technical support via satellite (similar like ACMS)?Thank you for your help.FlugFan