If the INREQ is cancelled, who must transmit a message?

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Multiple Choice

If the INREQ is cancelled, who must transmit a message?

The key idea is that whoever started the INREQ controls its lifecycle. When the INREQ is cancelled, that same originator must transmit the cancellation so everyone receiving the INREQ knows it’s no longer active. This ensures all parties stop actions tied to the request and prevents confusion from lingering inquiries. The destination station would simply act on messages it receives; they don’t initiate cancellation. The RCC handles SAR coordination and message flow, but they don’t originate the cancellation unless directed by the original author. The flight plan originator may or may not be the same as the INREQ originator, but the rule is that the INREQ originator is the one responsible for cancelling it.

The key idea is that whoever started the INREQ controls its lifecycle. When the INREQ is cancelled, that same originator must transmit the cancellation so everyone receiving the INREQ knows it’s no longer active. This ensures all parties stop actions tied to the request and prevents confusion from lingering inquiries.

The destination station would simply act on messages it receives; they don’t initiate cancellation. The RCC handles SAR coordination and message flow, but they don’t originate the cancellation unless directed by the original author. The flight plan originator may or may not be the same as the INREQ originator, but the rule is that the INREQ originator is the one responsible for cancelling it.

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