CAT IIIC minimums

-----Original Message-----

From: Gary Drescher ]

Posted At: Monday, August 07, 2006 8:13 AM

Posted To: rec.aviation.ifr

Conversation: CAT IIIC minimums

Subject: CAT IIIC minimums



"Jim Carter" wrote in message

news:001c01c6b9e5$41b26ee0$4001a8c0@omnibook6100.. .

The lowest authorized ILS minimums, with all required ground and
airborne

systems components operative, are

....

I found ... on page 5-49 of the Instrument Procedures Handbook at




http://www.faa.gov/library/manuals/a...ocedures_handb
oo

k/



....



No, NA means "not authorized". See


http://www.naco.faa.gov/content/naco..._IAP_Intro.pdf
,

p.

53. (Also, Jeppesen's Instrument/Commercial Manual, Appendix B, lists
NA

as

an abbreviation for "not authorized".)



The material you cited above is entirely consistent with the "not

authorized" meaning.





Gary,

I pulled up the pdf file you supplied as reference and had adobe
search for the "not authorized" phrase. There is only one instance found
under the Alternate Minimums paragraph on page 53: "If NA appears,
alternate minimums are not authorized due to unmonitored facility or
absence of weather reporting service." I did not reference Jeppesen
because they are not the authority for this information.



Could this be a case of NA meaning one thing for CAT IIIc and
something else for other purposes? It probably would have made more
sense if the visibility requirement was shown as not required or
inapplicable.



How could an approach be authorized if the visibility requirement
is "not authorized"?





There is no CAT IIIc approach into JFK for runway 4R



Sorry, can you say how you arrived at that conclusion?





There is no CAT IIIc minima listed on the plate even though there is CAT
IIIa and b.





which is why it is not listed on the plate.



Couldn't it be unlisted because there are no DA or RVR limitations to

list?



--Gary



No, then it would be an unpublished approach wouldn't it? The definition
of CAT IIIc is zero/zero (more explicit language is found in my original
reference). The approach would be listed on the JFK plate if it was
approved and published. The EWS plate lists all three approach minima.