Which aircraft types do not require GPU support straps?

The correct choice identifies the aircraft types that do not require Ground Power Unit (GPU) support straps. The 787 AFT Receptacle and the 737 are designed with specific structural and engineering features that allow them to connect to ground power units without needing the additional support that straps would provide.

The 787, in particular, has a sophisticated electrical system that mitigates concerns surrounding stability when connected to ground power, allowing for safe and secure operations without the need for extra support. Similarly, the 737 is designed for ease of servicing and handling, which includes its power connection capabilities.

In contrast, the other aircraft types listed may have different requirements or specifications when it comes to the grounding and stabilization of their connections to external power sources. Aircraft like the 767, 777, and 747 may have structural factors that necessitate the use of GPU support straps to ensure a stable and secure connection while on the ground. This illustrates the importance of understanding specific aircraft systems and their operational logistics in fleet service practices.