Broadcast on ___________ frequencies to advise aircraft of a change in the ATIS code/message.

• A. VHF only
• B. All appropriate
• C. HF only
• D. UHF only

Answer: (B)

The main idea is to ensure every aircraft in the area can receive the updated ATIS information by broadcasting it on every frequency that could reach them. ATIS changes are shared across all channels that serve the airspace, not just one band, so pilots on different systems don’t miss the update. In practice, that means transmitting on VHF for civilian aircraft, UHF for military aircraft, and HF where applicable (such as over oceans or in remote areas). By using all appropriate frequencies, you maximize the likelihood that every airborne user sees the new ATIS code/message, reducing confusion and maintaining safe and coordinated operations. Broadcasting on only one band risks some users not receiving the change.