How frequently should PMS check 6641/005 M-9R be carried out?

The correct choice indicates that PMS check 6641/005 M-9R should be carried out once a month or as required. This frequency is essential for maintaining operational readiness and ensuring that equipment remains in good working condition. Regular checks help to identify any potential issues early, thus preventing more significant problems down the line.

Monthly checks align with standard maintenance practices that advocate for consistent and routine evaluation of equipment and systems. This practice helps to ensure that all necessary updates, repairs, or replacements can be efficiently managed within the operational schedule, contributing to overall mission success and readiness.