> This condition is caused by a software counter internal to the GCUs that will overflow after 248 days of continuous power. We are issuing this AD to prevent loss of all AC electrical power, which could result in loss of control of the airplane.
> A simple guess suggests the the problem is a signed 32-bit overflow as 231 is the number of seconds in 248 days multiplied by 100, i.e. a counter in hundredths of of a second.
> This condition is caused by a software counter internal to the GCUs that will overflow after 248 days of continuous power. We are issuing this AD to prevent loss of all AC electrical power, which could result in loss of control of the airplane.
> A simple guess suggests the the problem is a signed 32-bit overflow as 231 is the number of seconds in 248 days multiplied by 100, i.e. a counter in hundredths of of a second.