Offsetting from SIDs / STARs
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Join Date: Feb 2006
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Offsetting from SIDs / STARs
Hi Everyone,
It is my understanding that to ensure separation from terrain and other routes, you must adhere to SID / STAR routes within the tolerances of whichever RNP you are operating under, unless cleared for the deviation due to weather.
However today (like many other times here in China) ATC instructed me to offset 2 miles right just as I was about to start the STAR. One airport we frequent always tells us to offset 15 miles left for the STAR. In both cases the SID is the same route as the STAR and by offsetting they essentially get a two way street.
So - is this legal? How accurately do we really have to fly SIDs / STARs?
Thanks
It is my understanding that to ensure separation from terrain and other routes, you must adhere to SID / STAR routes within the tolerances of whichever RNP you are operating under, unless cleared for the deviation due to weather.
However today (like many other times here in China) ATC instructed me to offset 2 miles right just as I was about to start the STAR. One airport we frequent always tells us to offset 15 miles left for the STAR. In both cases the SID is the same route as the STAR and by offsetting they essentially get a two way street.
So - is this legal? How accurately do we really have to fly SIDs / STARs?
Thanks
Join Date: Mar 2005
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If above the MSA, and if you have the required terminal RNP (1, I guess) then it is not much different than a "fly direct to..."
however, they should clarify if you have to respect any altitude constraints
however, they should clarify if you have to respect any altitude constraints
Join Date: Dec 2006
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Knowing nothing about Chinese air law, I can only say it is clearly against ICAO provisions. According to 16.5.2 of PANS-ATM, SLOP shall only be authorized in en-route oceanic or remote continental airspace.
According to 16.5.2 of PANS-ATM, SLOP shall only be authorized in en-route oceanic or remote continental airspace.
Pilot initiated SLOPs are entirely different.
Last edited by Capt Chambo; 27th Jun 2011 at 23:46.
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WW,
First off, there are very, I mean very few RNP SID's in China...
That said, the box has the ability to fly on offset RNP track and maintain RNP.
A 15 nm offset is not RNP...the 'poor mans' RNP relies on vectors, and this may be the case in your example....
First off, there are very, I mean very few RNP SID's in China...
That said, the box has the ability to fly on offset RNP track and maintain RNP.
A 15 nm offset is not RNP...the 'poor mans' RNP relies on vectors, and this may be the case in your example....
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"XZY123, offset 3 mires reft, rima side."