There is no longer a reference to a maintenance log in the CFS 8000C Training Aid. There is a sample maintenance log in the 2008 5000C Training Aid at page 8-4. Maintenance log is referred to in the ATC Best Practices document 2014: "Inspection and maintenance documents shall be kept for each Approved Instrument, Approved Screening Device and accessory equipment in active use in the program. Documentation should include the results of all inspections and the maintenance history including records of parts replaced and approved modifications to hardware or software."