Which POA cannot be attached to a UH-60A/L/M cargo hook?

The 25K Apex Fitting without a spacer is not compatible with the UH-60A/L/M cargo hook because these helicopters have a specific weight rating and design requirement that necessitates the use of properly fitted equipment to ensure safe and effective operations. The configuration of the cargo hook on a UH-60A/L/M is designed to accommodate certain apex fittings and accessories, which must match the helicopter's load capabilities and operational safety standards.

In contrast, the other options provided — the polyester round sling, the 11K cargo hook reach pendant, and the 10K apex fitting with a spacer — are all designed to be compatible with the UH-60 cargo hook system. Each of these items aligns with the required specifications for load handling, weight ratings, and attachment mechanisms that ensure safe operations during sling load missions. This distinction highlights the importance of using appropriate equipment that meets the structural and operational requirements of the aircraft.