The AN/APR-39AC (V) is associated with detecting Pulse Wave threats annotated by which system?

• A. Infrared threat library
• B. Pulse Wave (PW) threats as annotated by the appropriate MDS
• C. Spectral radar risk map
• D. Visual threat catalog

Answer: (B)

Pulse Wave threats are identified by the Mission Data System’s threat annotations. The AN/APR-39AC (V) uses its threat library, but for Pulse Wave threats the signatures and recommended responses come from the aircraft’s specific Mission Data System configuration. This lets the APR-39 categorize a detected pulse-wave emission as a PW threat and cue the crew with the correct actions. Other options describe data sources for different sensor modalities or general risk mappings, which don’t apply to PW threat annotation for this system. So PW threats are annotated by the appropriate MDS.