Which of the following is NOT a Pre-Departure Inspection (PDI) for the ELT C?

The correct choice indicates that a fully charged battery is NOT a Pre-Departure Inspection (PDI) for the ELT C. In the context of emergency locator transmitters (ELTs), while ensuring that the equipment functions properly is essential, checking the battery status might not be explicitly included in the PDI checklist, which focuses on more immediate operational aspects.

A stop switch in place, an aerial in the stowed position, and proper stowage are critical components of ensuring the ELT is ready for deployment, as they relate directly to the physical readiness and safety protocols associated with the device. These elements help ensure that the ELT can be activated quickly and effectively in case of an emergency. Thus, while the battery being fully charged is undoubtedly important to the overall operation of the ELT, it typically falls under routine maintenance checks rather than the immediate PDI that relates to pre-flight safety readiness.