Private Pilot Flight Training and Instruction Flight Training Article Library | Back To 4VFR.COM Repairs The main difference between a 100-hour inspection and annual inspection is that the airframe and power plant mechanic can sign off the 100 hour but the annual sign-off requires inspection authorization. While an in-flight operational check may not be required it is very worthwhile. The pilot making the flight should sign the logbooks. Minor FAR 43.9(a) compliance Work done, date completed, certificate type/number, signature. TT (total time) not required FAR 43.9 requires that the person performing preventive maintenance must record the work in the maintenance records. The record must contain a description of the work, the date of the work, the name of the person doing the work, and approval or disapproval the aircraft for return to service. Major Return to service by FAR 65.95 Repair stations FAR 145 for propellers, instruments and avionics Discrepancies Need not be listed in logbook but separate discrepancy list must be signed off Written by Gene Whitt Flight Training Article Library | Back To 4VFR.COM