Change over point.
Thread Starter
Joined: May 2008
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From: Switzerland
NOtso
That's the problem I don't have any clue what is it! I met this question on my test it goes like-the establishment of change over points should be limited to route segment of how many NM?
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
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From: UK
For those of more limited experience (where's you bin hidin', NSF? 
) ,Change Over Point (COP) is a point on a leg (airway etc) where the reference navigation system is changed eg between 2 VORs of equal DOC on an airway - some say half-way, some differ. As long as you change!
As far as the test question goes - I have not got a clue! I have a vestigial memory of 51nm, however. Anyone recall? Something to do with airway width and VOR errors?
Rather frighteningly, in the rather trying 'absence' of LNAV
, I had to teach a QUALIFIED/RATED co-pilot how to fly an airway not so long back. 'How you do that' she said?
- isn't that Fridays, whether you need to or not? Obviously not been on a Harrier deployment...................................
) ,Change Over Point (COP) is a point on a leg (airway etc) where the reference navigation system is changed eg between 2 VORs of equal DOC on an airway - some say half-way, some differ. As long as you change!As far as the test question goes - I have not got a clue! I have a vestigial memory of 51nm, however. Anyone recall? Something to do with airway width and VOR errors?
Rather frighteningly, in the rather trying 'absence' of LNAV
, I had to teach a QUALIFIED/RATED co-pilot how to fly an airway not so long back. 'How you do that' she said?
when you change over your undies for clean ones
Last edited by BOAC; 18th May 2008 at 21:58.
Joined: May 2000
Posts: 3,204
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From: Seattle
Half way between the VORs, unless a COP is published on the airway. For a high altitude route it will normally be published if the segment is >260 NM -- twice the "service volume" range of an 'H' rated VOR.
See FAA AIM 1-1-8 and 5-3-6.
See FAA AIM 1-1-8 and 5-3-6.
Joined: Mar 2000
Posts: 8,571
Likes: 3
From: Arizona USA
Change over points, with respect to VOR navigation, are normally determined by the type of VOR transmitter installation, and the terrain over which the airways lies...mountains, etc.
Many variables involved.
Change over points are normally printed on the specific aeronautical chart, and where they do not exist, changing to the next VOR station should be accomplished at the half-way point.
Pretty basic stuff.
Many variables involved.
Change over points are normally printed on the specific aeronautical chart, and where they do not exist, changing to the next VOR station should be accomplished at the half-way point.
Pretty basic stuff.
Joined: Dec 2006
Aviation Qualifications: CPL
Posts: 433
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From: Hamburg
alj87,
ICAO Annex 2 defines what a changeover point is:
ICAO Annex 2 defines what a changeover point is:
Changeover point. The point at which an aircraft navigating
on an ATS route segment defined by reference to very high
frequency omnidirectional radio ranges is expected to transfer
its primary navigational reference from the facility
behind the aircraft to the next facility ahead of the aircraft.
Note.— Changeover points are established to provide the
optimum balance in respect of signal strength and quality
between facilities at all levels to be used and to ensure a common
source of azimuth guidance for all aircraft operating
along the same portion of a route segment.
on an ATS route segment defined by reference to very high
frequency omnidirectional radio ranges is expected to transfer
its primary navigational reference from the facility
behind the aircraft to the next facility ahead of the aircraft.
Note.— Changeover points are established to provide the
optimum balance in respect of signal strength and quality
between facilities at all levels to be used and to ensure a common
source of azimuth guidance for all aircraft operating
along the same portion of a route segment.
