more bitching about the IFR written - CDI left/right versus north/south/etc

C J Campbell wrote:
"G. Sylvester" wrote in message
...

A month or two ago there was a thread about CDI indicating north/south
vs. left/right in particular on front course and back course LOC.
I'm studying for the IFR written and not in a single place
does the FAA use north/south.


What in heck are you referring to? The CDI refers only to right or left of
the course indicated by the OBS and the TO/FROM window. You have to know how
to use the CDI when it appears to be reverse sensing.

The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is defined
as looking inward on the front course. It's only when the pilot's left and
right is reversed (as they are looking inward on the back course) that things
are "reversed."

On Thu, 06 Jan 2005 11:52:39 -0500, Ron Natalie
wrote:

The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is defined
as looking inward on the front course. It's only when the pilot's left and
right is reversed (as they are looking inward on the back course) that things
are "reversed."


This is not true. The OBS ring has no effect on the needle, but it
certainly has meaning.

If the OBS ring is set to the inbound (only) localizer course, it can
be interpreted exactly as the equivalent VOR course.

wrote:
On Thu, 06 Jan 2005 11:52:39 -0500, Ron Natalie
wrote:


The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is defined
as looking inward on the front course. It's only when the pilot's left and
right is reversed (as they are looking inward on the back course) that things
are "reversed."



This is not true. The OBS ring has no effect on the needle, but it
certainly has meaning.

If the OBS ring is set to the inbound (only) localizer course, it can
be interpreted exactly as the equivalent VOR course.

You can make the same interpretations no matter what the OBS is set to.
It is necessary and sufficient to know what the inbound course is.

The only time the selector is useful is on a HSI.

GPS indicators can reverse sense also.

wrote in
:

On Thu, 06 Jan 2005 11:52:39 -0500, Ron Natalie
wrote:

The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is
defined as looking inward on the front course. It's only when the
pilot's left and right is reversed (as they are looking inward on the
back course) that things are "reversed."


This is not true. The OBS ring has no effect on the needle, but it
certainly has meaning.

If the OBS ring is set to the inbound (only) localizer course, it can
be interpreted exactly as the equivalent VOR course.


Exactly. Glad to see someone else using a more sensible interpretation.

"Ron Natalie" wrote in message
m...
C J Campbell wrote:
"G. Sylvester" wrote in message
...

A month or two ago there was a thread about CDI indicating north/south
vs. left/right in particular on front course and back course LOC.
I'm studying for the IFR written and not in a single place
does the FAA use north/south.


What in heck are you referring to? The CDI refers only to right or left
of
the course indicated by the OBS and the TO/FROM window. You have to know
how
to use the CDI when it appears to be reverse sensing.

The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is defined
as looking inward on the front course. It's only when the pilot's left
and
right is reversed (as they are looking inward on the back course) that
things
are "reversed."

That is all true.

On Thu, 6 Jan 2005 12:43:20 -0800, "C J Campbell"
wrote:


"Ron Natalie" wrote in message
om...
C J Campbell wrote:
"G. Sylvester" wrote in message
...

A month or two ago there was a thread about CDI indicating north/south
vs. left/right in particular on front course and back course LOC.
I'm studying for the IFR written and not in a single place
does the FAA use north/south.


What in heck are you referring to? The CDI refers only to right or left
of
the course indicated by the OBS and the TO/FROM window. You have to know
how
to use the CDI when it appears to be reverse sensing.

The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is defined
as looking inward on the front course. It's only when the pilot's left
and
right is reversed (as they are looking inward on the back course) that
things
are "reversed."

That is all true.



Almost.

The OBS has much meaning to a CDI when using a localizer course, if
you just know how to interpret said meaning.

wrote in message
...

The OBS has no meaning to a CDI when using a localizer.
It's left or right of the localizer beam where "left and right" is
defined
as looking inward on the front course. It's only when the pilot's
left
and
right is reversed (as they are looking inward on the back course) that
things
are "reversed."

That is all true.



Almost.

The OBS has much meaning to a CDI when using a localizer course, if
you just know how to interpret said meaning.

It has no meaning to the CDI, which after all is an inanimate object. If you
are properly trained it should have some meaning for you.