What is the designation of the test pilot training aircraft used by the United States Naval Test Pilot School?

The designation of the test pilot training aircraft used by the United States Naval Test Pilot School is the TH-57. This aircraft, a variant of the Bell 206 JetRanger, is primarily utilized for various aviation training purposes, including for test pilot training. The TH-57 is valued for its versatility and reliability, making it suitable for both instructional flights and evaluation tasks.

In the context of test pilot training, the TH-57 provides students with the necessary flying experience and skill development in a stable and well-known platform. It allows for testing different systems and maneuvering characteristics, which are integral to the curriculum of test pilot students who will later need to assess and validate new aircraft systems and designs.

Other options represent different aircraft but are not associated with the test pilot training curriculum at the Naval Test Pilot School. The TH-6B is a modern trainer variant, while the SH-60B/F are multi-mission helicopters used for naval operations. The T-39D/N/G, primarily used for jet training, does not fit the role of a helicopter-based test pilot training aircraft. Thus, the TH-57's specific application in test pilot training within the U.S. Naval framework underscores its correct designation as the training aircraft for this purpose.