What is the IAD/CAD frequency?

What is the IAD/CAD frequency?

• A. 121.5 MHz
• B. 243.0 MHz
• C. VHF 156.525
• D. 2187.5 kHz

Answer: (A)

The main idea here is recognizing the international emergency frequency used for distress and safety communications. The standard for such urgent calls is 121.5 MHz, which is widely monitored by search-and-rescue services and aircraft alike, making it the best choice for initiating a rapid alert or distress call in interagency dispatch scenarios. The other options align with different services or bands: 243.0 MHz is the UHF emergency frequency used by military personnel, not the civilian IAD/CAD context; 156.525 is a civilian VHF channel not designated as the primary distress frequency in this scenario; 2187.5 kHz sits in the MF maritime band and is used for maritime distress, not the aviation/interagency dispatch scenario at hand.

The main idea here is recognizing the international emergency frequency used for distress and safety communications. The standard for such urgent calls is 121.5 MHz, which is widely monitored by search-and-rescue services and aircraft alike, making it the best choice for initiating a rapid alert or distress call in interagency dispatch scenarios.

The other options align with different services or bands: 243.0 MHz is the UHF emergency frequency used by military personnel, not the civilian IAD/CAD context; 156.525 is a civilian VHF channel not designated as the primary distress frequency in this scenario; 2187.5 kHz sits in the MF maritime band and is used for maritime distress, not the aviation/interagency dispatch scenario at hand.