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

From: Andrey Serbinenko ]

Posted At: Sunday, August 06, 2006 10:36 PM

Posted To: rec.aviation.ifr

Conversation: CAT IIIC minimums

Subject: CAT IIIC minimums



..



Can you give us a particular plate or approach to reference please?





Okay, I have an answer and a reference (highlights are mine).



The lowest authorized ILS minimums, with all required ground and
airborne systems components operative, are



.. Category I - Decision Height (DH) 200 feet and Runway Visual Range
(RVR) 2,400 feet (with touchdown zone and centerline lighting, RVR 1800
feet),

.. Category II - DH 100 feet and RVR 1,200 feet,

.. Category IIIa - No DH or DH below 100 feet and RVR not less than 700
feet,

.. Category IIIb - No DH or DH below 50 feet and RVR less than 700 feet
but not less than 150 feet, and

.. Category IIIc - No DH and no RVR limitation.



NOTE: Special authorization and equipment are required for Category II
and III.



I found the above on page 5-49 of the Instrument Procedures Handbook at
http://www.faa.gov/library/manuals/a...cedures_handbo
ok/



So contrary to what others have suggested, the NA does not mean "not
authorized"; rather, it means "not applicable". There is "No DH and no
RVR limitation" for the CAT IIIc approach. Category IIIc conditions has
visibility insufficient for taxi operations according to the text on
page 5-48.



There is no CAT IIIc approach into JFK for runway 4R which is why it is
not listed on the plate.



There is a CAT IIIc approach into Newark; the NA is under the visibility
requirement.