Which type of chock has been used until the receipt of NWC-5 for H-2 helicopters?

The type of chock that has been used until the receipt of NWC-5 for H-2 helicopters is the NWC-3. This chock is designed specifically for the configurations and requirements of H-2 helicopters, ensuring that they are safely and securely positioned during operations.

It is important to note that the NWC-3 chock provides the necessary support to prevent movement, reflecting the engineering considerations necessary for handling these aircraft. The transition to NWC-5 indicates an evolution in the design or specifications for chocks used with H-2 helicopters, typically aimed at enhancing safety or functionality.

Understanding the context of the various chocks, such as NWC-1, NWC-4, and NWC-6, reveals that each has its specific design purposes and may be suited for different types of aircraft or operational conditions. However, in the specific context of H-2 helicopters prior to NWC-5, the NWC-3 had been the standard utilized.