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Guest jibbyq

Wierd AIR System Behaviour

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Guest jibbyq

Hi,During my first vatsim flight with the MD-11 I experienced some strange behavior with the AIR system. The AIR system was operating in automatic mode and after 15 minutes at cruise altitutde I received a master caution, AVNCS FAN OVRD alert and "Cabin Altitude" aural alert.I checked the AIR page on the SD to find that the system controller had turned off all 3 engine bleeds and all 3 packs. I switched the AIR system into manual mode, opened the Bleeds and started the Packs which allowed the cabin pressure to return to normal. If I rengaged automatic mode however the system would once again command the Packs to turn off and the Bleeds to close. I completed the flight therefore with AIR in manual mode.I was not flying with failures on at the time, any ideas what may have caused this behavior? Jibran

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