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deepfield

Departure Procedure Question

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Looking at the Seattle Four Departure I was a bit stumped by what this means.

 

TAKE-OFF RUNWAY 16L: Climb heading 164° and SEA R-161, thence maintain assigned altitude, expect radar vectors to assigned route

 

 

I understand it all but the SEA R-161 part. I know SEA is the Seattle VOR but what does R-161 mean? Flying the departure is also strange because after you clear the runway you immediately turn back and fly past the airport to pass over the SEA VOR.

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Depart on heading of 164 degrees to intercept the Seattle VOR (SEA VOR) 161 radial outbound.  Vectors on course will follow.

 

Its kind of a strange departure procedure because it means two takeoff runways at east and west side of the airport converge to the SEA 161 radial.  Departure procedures usually try to avoid that but I guess this procedure they space the departures.

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Depart on heading of 164 degrees to intercept the Seattle VOR (SEA VOR) 161 radial outbound.  Vectors on course will follow.

 

Its kind of a strange departure procedure because it means two takeoff runways at east and west side of the airport converge to the SEA 161 radial.  Departure procedures usually try to avoid that but I guess this procedure they space the departures.

 

Ah makes sense. I was thinking that's what it was. Thank you, Mark.

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