CNN article on problems in Air Travel, as seen by FAA

Airbus writes:

Well, airports themselves don't fly, but concerning approach paths, how about
the fact that non-overlay GPS approaches use different paths from other
existing approaches. Does that make it more clear?

What's clear is that GPS cannot come close to matching the precision of ILS.
Augmentation systems essentially reproduce many of the disadvantages (and
advantages) of ILS.

Mxsmanic wrote:
Airbus writes:

Well, airports themselves don't fly, but concerning approach paths, how about
the fact that non-overlay GPS approaches use different paths from other
existing approaches. Does that make it more clear?

What's clear is that GPS cannot come close to matching the precision of ILS.
Augmentation systems essentially reproduce many of the disadvantages (and
advantages) of ILS.

Such as?

--
Jim Pennino

Remove .spam.sux to reply.

writes:

Such as?

Such as the need for local transmitters at every airport. LAAS requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is to be
fully replaced.

Mxsmanic wrote:
writes:

Such as?

Such as the need for local transmitters at every airport. LAAS requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is to be
fully replaced.
Perhaps you should use some of your vaunted research skills to see what
the accuracy of WAAS is. It's better then a ILS and the WAaS approachs
have the same minimums as the ILS approachs.

john writes:

Perhaps you should use some of your vaunted research skills to see what
the accuracy of WAAS is. It's better then a ILS and the WAaS approachs
have the same minimums as the ILS approachs.

I have indeed done the research. The whole reason for LAAS is that WAAS isn't
good enough to replace ILS entirely. WAAS can match some Category I
performance. LAAS will be needed to get to Category III, and since you need
Cat IIIc to replace ILS, WAAS certainly isn't going to do it, and LAAS
probably won't do it for a while yet.

If you think that WAAS is better than ILS, you need to tell the government
about it right away, so they can save billions of dollars of development costs
on LAAS.

Mxsmanic wrote:
writes:

Such as?

Such as the need for local transmitters at every airport. LAAS requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is to be
fully replaced.

What about multipath?

--
Jim Pennino

Remove .spam.sux to reply.

wrote:
Mxsmanic wrote:
writes:

Such as?

Such as the need for local transmitters at every airport. LAAS requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is to be
fully replaced.

What about multipath?



LAAS uses one frequency to upload the corrections necessary
for CAT 2 and 3. IAW, one VHF uplink.

Jam it or lose it and you lost all your CAT 2 or 3

Single Thread is not good

WhoGivesAFig? wrote:
wrote:
Mxsmanic wrote:
writes:

Such as?

Such as the need for local transmitters at every airport. LAAS
requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is
to be
fully replaced.

What about multipath?



LAAS uses one frequency to upload the corrections necessary for CAT 2
and 3. IAW, one VHF uplink.

Jam it or lose it and you lost all your CAT 2 or 3

Single Thread is not good


Look at this link

Notice the VHF uplink

JUST ONE

Not good

http://en.wikipedia.org/wiki/Local_A...ntation_System

Maybe a LAAS and a JPALS as a backup may be a good
redundancy plan??

I say it must be done that way if you remove the ILS systems

WhoGivesAFig? wrote:
wrote:
Mxsmanic wrote:
writes:

Such as?

Such as the need for local transmitters at every airport. LAAS requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is to be
fully replaced.

What about multipath?



LAAS uses one frequency to upload the corrections necessary
for CAT 2 and 3. IAW, one VHF uplink.

Jam it or lose it and you lost all your CAT 2 or 3

Single Thread is not good

So, if you don't have LAAS and the ILS goes tits up, what's the backup?


--
Jim Pennino

Remove .spam.sux to reply.

wrote:
WhoGivesAFig? wrote:
wrote:
Mxsmanic wrote:
writes:
Such as?
Such as the need for local transmitters at every airport. LAAS requires this,
and since WAAS cannot match ILS precision, LAAS is required if ILS is to be
fully replaced.
What about multipath?



LAAS uses one frequency to upload the corrections necessary
for CAT 2 and 3. IAW, one VHF uplink.

Jam it or lose it and you lost all your CAT 2 or 3

Single Thread is not good

So, if you don't have LAAS and the ILS goes tits up, what's the backup?



My vote would be JPALS. The LAAS version of TACAN