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Radar Vectors  
User currently offlineBill bob From United States of America, joined Apr 2001, 49 posts, RR: 0
Posted (12 years 10 months 2 weeks 3 days 21 hours ago) and read 2165 times:

What special equipment do you need to accept a radar vector? Heard on scanner, atc said go direct to xyz, pilot said they were unable but equipped for radar vector to xyz.? Thanks

5 replies: All unread, jump to last
 
User currently offlineTimz From United States of America, joined Sep 1999, 6798 posts, RR: 7
Reply 1, posted (12 years 10 months 2 weeks 3 days 20 hours ago) and read 2130 times:

I'm no expert, but I think the pilot was just asking for a magnetic compass heading. If the plane is not equipped to navigate itself to any specified lat-lon (as all newer airliners are) then they can just fly the suggested heading (or a later improved heading) until they're in radio range of the VOR (?) that ATC has cleared them to.

User currently offlineBill bob From United States of America, joined Apr 2001, 49 posts, RR: 0
Reply 2, posted (12 years 10 months 2 weeks 3 days 20 hours ago) and read 2114 times:

Ok thanks, is that magnetic compass heading the one that is close to the windscreen near the top in most aircraft? Is it also called a "true course" or "true heading"? I seem to be confused on that. thanks

User currently offlineZiggy From United States of America, joined Jun 2001, 178 posts, RR: 0
Reply 3, posted (12 years 10 months 2 weeks 3 days 19 hours ago) and read 2104 times:

What you read off the Compass is the magnetic heading. I.E. does not include wind correction.  Smile

User currently offlineRalgha From United States of America, joined Nov 1999, 1614 posts, RR: 6
Reply 4, posted (12 years 10 months 2 weeks 3 days 16 hours ago) and read 2088 times:

Equipment required for radar vectors (though not by FARs):

* Transponder
* Mag. Compass
* Altimiter

True heading is the direction the aircraft is facing measured from true north.

True course is the direction the aircraft is traveling measured from true north.

Magnetic heading is the direction the aircraft is facing measured from magnetic north.

Magnetic course is the direction the aircraft is traveling measured from magnetic north.



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User currently offlineTimz From United States of America, joined Sep 1999, 6798 posts, RR: 7
Reply 5, posted (12 years 10 months 2 weeks 3 days 2 hours ago) and read 2072 times:

Whenever ATC tells the pilot "Turn right zero six zero" they mean turn to a magnetic heading of 60 degrees. And as far as I know that's any pilot-- airliner or C172.

It's not unusual to be cleared direct to a VOR that's several hundred miles away, and (for instance) some (many? most?) 727s don't have the modern nav systems to automatically fly directly to a VOR beyond radio range. So ATC makes a guess at the initial magnetic heading and says something like "Fly heading zero six zero until receiving [the VOR] then proceed direct." Since ATC doesn't know the winds aloft no one can expect the guess to be perfect, so as the flight continues ATC might tell them to turn five or ten degrees to correct.


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