Actually the type of pilot license is required, somewhere there is an advisory circular about this. Ie c@n use pp for private, cp for commercial, and of course atp. Ex. Owner/pilot CP #1234567
AC No: 43-12A
(3) If the work has been performed satisfactorily,“...the signature, certificate number, and kind of certificate held by the person approving the work” (§ 43.9(a)(4)). When preventive maintenance is performed as authorized in § 43.3(g), (h), and (i), the certificate may be indicated in a manner which would be clear to the reader (e.g., PP, CP, or ATP might be used to indicate private, commercial, or airline transport pilot, respectively). The certificate number is that number displayed on the certificate being exercised. Affixing a signature to the entry, which describes the work accomplished, constitutes approval for return to service.
NOTE: Section 43.9(a)(3) is not applicable when preventive maintenance is performed by the holder of a pilot’s certificate because owners/pilots are not authorized to approve work accomplished by others. The only person who