During an engine control system inspection, what should be checked about the threaded rod ends?

The focus of this question is on the importance of verifying thread engagement in threaded rod ends during an engine control system inspection. Checking the amount of thread engagement using inspection holes is critical since proper engagement ensures structural integrity and safe operation of the engine's control system.

When rod ends are not adequately engaged, it can lead to failure under the stresses experienced during operation. The use of inspection holes provides a direct visual or tactile method for the technician to assess whether the threads are fully engaged and can withstand operational forces without risk of loosening or separation.

Other options, while related to the maintenance and operation of the rod ends, do not specifically focus on the critical aspect of thread engagement which is essential for safety and reliability. Ensuring safety wire presence, while important for preventing fasteners from loosening, doesn't address the actual engagement quality. Similarly, checking thread counts or lubrication status is part of the broader maintenance routine but does not directly assess the integrity of the engagement critical for safe operation.