Incompatibility between airframe and engine related tasks in the maintenance programme.

A properly developed maintenance programme should not contain inconsistencies in the performance of tasks required for airframe and engine continuing airworthiness.

One of the characteristics of a proper maintenance programme is its adaptation to operating times and shutdowns in order to carry out scheduled maintenance without impairing continued airworthiness.

In the EASA environment the engine TC Holder must establish the engine ICAs. Each TC Holder must do the ICAs that correspond to him, so there should be no incompatibilities between airframe and engine ICAs, and in case of doubt, the instructions of both TC Holders (or the most critical one) should be complied with, unless the airframe TC Holder demonstrates that EASA has authorised otherwise.

In NON-EASA environments, aircraft can be found without an engine TC, in which the engine TC was considered as just another piece of equipment when certifying the aircraft type, so each case would have to be analysed.