Bill Bob
Posts: 49
Joined: Sat Apr 07, 2001 9:54 pm

Radar Vectors

Fri Sep 21, 2001 9:35 am

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
 
timz
Posts: 6116
Joined: Fri Sep 17, 1999 7:43 am

RE: Radar Vectors

Fri Sep 21, 2001 10:42 am

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.
 
Bill Bob
Posts: 49
Joined: Sat Apr 07, 2001 9:54 pm

Timz

Fri Sep 21, 2001 11:24 am

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
 
Ziggy
Posts: 173
Joined: Thu Jun 21, 2001 11:07 am

RE: Timz

Fri Sep 21, 2001 12:21 pm

What you read off the Compass is the magnetic heading. I.E. does not include wind correction.  Smile
 
Ralgha
Posts: 1589
Joined: Tue Nov 09, 1999 6:20 pm

RE: Timz

Fri Sep 21, 2001 3:06 pm

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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timz
Posts: 6116
Joined: Fri Sep 17, 1999 7:43 am

RE: Radar Vectors

Sat Sep 22, 2001 4:45 am

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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