Which elements are typically included in testing the launcher data link?

• A. Weather data feed only.
• B. Mechanical weight test.
• C. Visual inspection only, no data exchange.
• D. Data-link loopback or handshake tests, test engagement orders, and verification of data integrity and acknowledgement.

Answer: (D)

Testing the launcher data link centers on ensuring reliable two-way communication between the launcher and its control system, including how commands are sent, received, and acknowledged. The best choice covers data-link loopback or handshake tests to prove the transmitter and receiver can exchange signals and establish synchronization, test engagement orders to simulate real commands and confirm they are correctly encoded, transmitted, and interpreted, and verification of data integrity and acknowledgement to ensure messages arrive uncorrupted and that the receiver confirms receipt. Together, these elements verify end-to-end data transmission, timing, and reliability that are essential for safe and effective operation. Relying on a weather data feed, or performing only mechanical weight tests, or doing visual inspection with no data exchange, does not exercise the communications path and misses critical checks of data integrity, handshaking, and command acknowledgement.