What is the main focus of phase inspection?

The main focus of phase inspection is indeed on sequential inspections performed at specific intervals. This type of inspection is designed to ensure that aircraft are maintained at regular intervals to adhere to safety and operational standards. In a phase inspection, different systems and components of the aircraft are checked during each phase, allowing maintenance personnel to manage the workload effectively and maintain aircraft readiness. This systematic approach helps identify potential issues before they lead to significant problems, thereby enhancing the overall safety and reliability of the aircraft.

In contrast to this systematic method, correcting discrepancies focuses more on addressing issues that arise during inspections rather than a proactive maintenance strategy. Daily operational checks pertain to verifying the aircraft's readiness for operations on a day-to-day basis, which is different from the more comprehensive and planned nature of phase inspections. The initial acceptance of aircraft relates to the process of evaluating a new or overhauled aircraft upon its delivery, which again differs from the ongoing maintenance and inspection strategy employed in phase inspections. Thus, the periodic and structured nature of phase inspections is what distinguishes it as the correct answer.