Which form is primarily used as the operational log for recording preventive maintenance checks and service entries for POL?

The correct form used as the operational log for recording preventive maintenance checks and service entries for Petroleum, Oil, and Lubricants (POL) is the NAVMC 10523. This particular form is explicitly designed for tracking maintenance activities, ensuring that all preventive measures are documented properly. It serves as an essential tool for equipment chiefs in maintaining accurate records of service performed and can be vital for scheduling future maintenance, ensuring compliance with maintenance standards, and enhancing the reliability of equipment.

The other forms listed are tailored for different purposes or types of maintenance documentation. Understanding the unique functions of each form can help personnel select the appropriate documentation for various maintenance tasks and operational logs. This specificity is crucial for efficient equipment management and operational readiness.