Are aircraft separately certified for CAT III ops for +2500 feet elevation? Is it mandatory have separate certification for aircraft operating CAT III Operations on airports having elevation more than 2500 feet? If so do that aircraft are to carry any additional equipment?

One of our airline operator has submitted a list of their aircraft which are certified for CAT III operations at airports above 2500 feet elevation. We are yet to be equipped with CAT III, hence we would like to know if we have to have any additional ground systems to enable all aircraft to operate CAT III.
Yes. In certain jurisdictions.

Such as Europe, if it has not been demonstrated during flight testing.

This is covered in CS-AWOS / Subpart 1 (which covers Automatic Landing Systems).


  In accordance with CS–AWO 132, the effects of aerodrome conditions (e.g. elevation, ambient temperature, runway slope and ground profile under the approach path) are to be investigated and, if necessary, appropriate limitations derived for inclusion in the aeroplane Flight Manual. Guidance is given in paragraph 5.


Paragraph 5:


  Elevation and Temperature. The effects of aerodrome elevation and ambient temperature should be examined where operation is envisaged at aerodromes about 750 m (2 500 ft) or in temperatures greater than ISA + 15°C.


A performance demonstration would then be required (but not additional equipment).