The -500 could be dispatched with the ACS inoperative. The input rod to the outboard ailerons servo could be lengthened by removing two bolts, extending the rod and replacing the bolts into two new holes. Complete instructions for the procedure were on a plastic lamaniated card carried in the F.E. desk drawer.
Yup...however, a rather large takeoff weight penalty was imposed, as I recall.
Having said this...never had the system fail.
Worked to perfection.
Ahhhh, Lockheed