What frequency should be on COM2 when ACARS is working normally?

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Multiple Choice

What frequency should be on COM2 when ACARS is working normally?

Explanation:
Guard and emergency monitoring on COM2 uses 121.5 MHz, the universal distress and guard frequency. When ACARS is working normally, you still keep COM2 tuned to 121.5 so you can immediately hear any distress calls or rescue coordination, even if the primary data/link channel is in use or unavailable. The other frequencies are used for different voice or data channels and do not provide the same reliable safety backup as the guard frequency.

Guard and emergency monitoring on COM2 uses 121.5 MHz, the universal distress and guard frequency. When ACARS is working normally, you still keep COM2 tuned to 121.5 so you can immediately hear any distress calls or rescue coordination, even if the primary data/link channel is in use or unavailable. The other frequencies are used for different voice or data channels and do not provide the same reliable safety backup as the guard frequency.

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