Which reporting accuracy is specified for ETA reporting when outside radar?

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Multiple Choice

Which reporting accuracy is specified for ETA reporting when outside radar?

Explanation:
ETAs reported when you’re outside radar are specified to be within plus or minus 3 minutes. This margin recognizes the greater uncertainty you have when you’re not being tracked by radar, since you can’t be observed as precisely as you can inside radar coverage. With radar, ETAs can be tighter—often within about one minute—because ATC can monitor your actual progress more accurately. A tolerance of plus or minus 5 minutes would be too imprecise for effective sequencing and spacing, and saying no ETA is required contradicts standard practice for operations outside radar. So, plus or minus 3 minutes is the correct specification.

ETAs reported when you’re outside radar are specified to be within plus or minus 3 minutes. This margin recognizes the greater uncertainty you have when you’re not being tracked by radar, since you can’t be observed as precisely as you can inside radar coverage. With radar, ETAs can be tighter—often within about one minute—because ATC can monitor your actual progress more accurately. A tolerance of plus or minus 5 minutes would be too imprecise for effective sequencing and spacing, and saying no ETA is required contradicts standard practice for operations outside radar. So, plus or minus 3 minutes is the correct specification.

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