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Sadde 6 Arrival  
User currently offlineModesto2 From United States of America, joined Jul 2000, 2789 posts, RR: 5
Posted (13 years 7 months 2 weeks 4 days 22 hours ago) and read 3400 times:

Correct me if I'm wrong, but the arrival chart for Sadde 6 shows SMO 068 radial. However, ATC clears aircraft on the 070 radial. Why is there a discrepancy? Thanks.

8 replies: All unread, jump to last
 
User currently offlineRalgha From United States of America, joined Nov 1999, 1614 posts, RR: 6
Reply 1, posted (13 years 7 months 2 weeks 4 days 21 hours ago) and read 3353 times:

ATC doesn't have to follow a STAR, a STAR is there to ease workload on ATC if they choose to use it. Often they will use it, but they will also often modify it facilitate the traffic flowl. 


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User currently offlineTimz From United States of America, joined Sep 1999, 6800 posts, RR: 7
Reply 2, posted (13 years 7 months 2 weeks 4 days 19 hours ago) and read 3343 times:

...don't they actually clear them to depart SMO heading 070? (You recall that's not the same as the 070 radial.)

User currently offlineAAR90 From United States of America, joined Jan 2000, 3466 posts, RR: 47
Reply 3, posted (13 years 7 months 2 weeks 4 days 17 hours ago) and read 3342 times:

>...don't they actually clear them to depart SMO heading 070?

Correct. Why? I don't know... ATC just does it.



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User currently offlineModesto2 From United States of America, joined Jul 2000, 2789 posts, RR: 5
Reply 4, posted (13 years 7 months 2 weeks 4 days 1 hour ago) and read 3322 times:

Could you please explain the difference between 070 radial and a 070 heading? Thanks!

User currently offlineRalgha From United States of America, joined Nov 1999, 1614 posts, RR: 6
Reply 5, posted (13 years 7 months 2 weeks 3 days 18 hours ago) and read 3321 times:

Heading 070 means turn until your heading indicator shows you facing 70 degrees magnetic. Different types of airplanes use different types of heading indicators, but they all show magnetic headings.

Radial 070 is a bit more complicated. I'll assume that you don't know much about VOR stations in the following explanation, if you do know much about it, overlook what you already know 

A VOR station is basically a radio transmitter. A typical station, physically, is a low, round building, with a large cone shaped antenna sticking up out of the center, and a series of small antennas around the top perimeter of the building.

VOR stands for VHF Omnidirectional Range. The VOR station projects (transmits) straight line courses (radials) in all directions. Imagine a bicycle wheel, the VOR station is the hub, and the radials are the spokes (though in reality there are infinatly many radials).

For navigation purposes, we are only concerned with the radials that correspond to whole degrees, and we number them starting with 1, which is the radial that goes away from the VOR in the direction that is 1 degree east of magnetic north. We then number each radial according to it's corresponding degree value (from magnetic north).

Therefore, radial 070 is the radial that has a direction 70 degrees east of magnetic north, starting at the VOR station and proceeding away from it.

Hope this makes sense and is helpful  



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User currently offlineTimz From United States of America, joined Sep 1999, 6800 posts, RR: 7
Reply 6, posted (13 years 7 months 2 weeks 3 days 17 hours ago) and read 3311 times:

Like he said, "070 heading" means the aircraft is pointed 70 degrees east of magnetic north. If there's no crosswind the aircraft will track the 070 radial, but if there is it won't.

User currently offlineN766AS From , joined Dec 1969, posts, RR:
Reply 7, posted (13 years 7 months 2 weeks 3 days 15 hours ago) and read 3305 times:

My understanding is that ATC doesn't usually direct an aircraft to fly an odd heading (as opposed to a rounded heading, i.e. 160), such as 068. They just round it up to 070... For short distances, two degrees won't make much of a difference anyway.

User currently offlineTimz From United States of America, joined Sep 1999, 6800 posts, RR: 7
Reply 8, posted (13 years 7 months 2 weeks 3 days ago) and read 3298 times:

... I guess it's pretty common for the STAR to show a final track along a radial and the controllers to assign a heading instead. You recall that Modesto arrivals into SFO are invariably told to depart CEDES heading 230 or whatever, and HADLY arrivals usually depart HADLY heading 360, etc.

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