FAR 43.11(a)(b) Type, description, date, total time, signature, certificate type and number; approval or disapproval for return to service Advisory Directives (Ads) compliance (work, inspection, repair) completed and signed off
Routine
100 hour, minor alterations. A & P sign off required
Required
Annual or progressive, major alteration AI sign off required and compliance with ADs.
Manufacturer's
Not in FARs but require A & P signoff