lumax
Well-known member
- Joined
- May 5, 2002
- Posts
- 206
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The performance required to fly an RNP route is generally specified in nautical miles, e.g. RNP 4 which implies that the total system error will be no greater than 4 NM for 95% of the time. The RNP specification requires that if the error exceeds or is likely to exceed twice the specified value (i.e. 8NM for RNP 4) then an alert must be generated. Since the deviation is likely to exceed the alerting deviation before the error can be rectified, route spacing must be sufficient to ensure that two aircraft deviating to the alert level toward one another will remain safely separated. RNP 4 thus supports 30 NM lateral or longitudinal spacing.
I've flown RNP approaches but I am not familiar with these terms. From what I could find on the web, RNP-5 and RNP-10 are used for en-route separation on oceanic routes.
Can anyone shed more light on this?
Do you have a good source for more info?
Thanks
I got a CPDLC response recently when I requested a climb that went something like this, "Unable, B77W 25 miles ahead." Had to look up the W to see that it stood for RNP 10.