A109SP AP P FAIL
 

Hi

maybe any of you know system better , if 1 AP P FAIL shortly after TO maybe be caused by battery condition not very well ? why am I asking ,
because every time when we connect GPU before flight in BATT charge mode for about an hour , message didn't pop up after takeoff , but if we not recharge BATT before flight than almost every time it will pop-up after takeoff . For me that make no sense because when engines are running power supply is good enough from generators but this is fact and was tested several times that's why I'm looking any relation between battery condition and auto flight system

Regards

That is a strange one - maybe if you could check the generator loads just before take-off in the 2 different situations, and see if there is a significant difference? It may be ( like you seem to be thinking) that if there is a very high generator load whilst charging the battery, then the AP is sensitive to any very small voltage drop.