Max approach angle for CATII/III
Would anyone be so kind as to confirm the maximum permitted glideslope angle for both CATII and CATIII approaches.
My local field has a 3.5 degree approach due to highish ground 1.5nm from the threshold. This was established back in the 80s after a runway extension and although the ground is no lower (or higher) than it was then, I am led to believe the CAA have now approved a reduction in the g/s to allow the ILS to be upgraded to CATII.
My conclusion from this is that (a) CATII/III not approved at 3.5 degrees, (b) CATII approved at somewhere between 3.0 and 3.49 degrees, but not CATIII. Interested to know whether there is any definitive guidance on this and, if the above hypothesis is correct, why CATIII is limited to 3 degrees.
Thanks