Commercial Fixed Wing
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Confusion; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy
Company Policy; Procedure
I decided to review OTS (Out of Service) on [our online system log] for status of [Program] Mod Evaluation visits at various stations.Apparently this aircraft may not have been scheduled for evaluation of the [Program] Modification because [Engineering Order X] is not applicable to it.While the applicability status of this particular [Engineering Order] revision is true; I questioned what other [Engineering Order] revisions might apply to this aircraft.According to [the log; the inspection] was accomplished at ZZZ [many months prior].By the basic criteria applied to other aircraft; Aircraft X may fit the criteria for evaluation of the [Program] Modification.Review of the OTS History reports indicated that this aircraft has not had said evaluation complied with at any [company] maintenance station.If this condition is true; this aircraft needs to be evaluated in the same manner as all other aircraft that were modified at ZZZ are being inspected.Apparently selection of the aircraft requiring evaluation of the [Program] Modification may have been based upon status of later [Engineering Order] revisions.[Engineering Order X] is an active revision.[Engineering Order] revisions [Y] and [Z] are marked as 'retired' and not viewable in the Currently Active [Engineering Order] search online.
Mechanic reported that aircraft may not have been evaluated as required due to confusing maintenance orders.