EASA documentation and guidelines here:
easa.europa.eu/community/topics/all-weather-operations-0
PDFs at the bottom of the page.
3.6.3 CAT III
The new AMC2 SPA.LVO.100(b) ‘CAT III operations’ transposes the requirements for CAT III operations from the
existing AMC5 SPA.LVO.100. The equipment requirements and operating procedures have been moved to
SPA.LVO.105 and the aerodrome requirements to SPA.LVO.110.
The subdivisions of category III have been removed. The lowest DH values to be used for particular aircraft
installations will be described in the AFM. The reference to the type of roll-out systems used is included to allow
the determination of the appropriate RVR value based on the pilot’s need to be able to control the roll-out (the
certification requirements are described in CS-AWO). GM2 SPA.LVO.100(b) offers additional information about
which systems are required for certain DHs.
The lowest RVR for a DH between 50 and 100 ft (previously CAT IIIA) will be 175 m (previously 200 m) to be
aligned with the new ICAO standard for CAT IIIA. The provision for an RVR of 150 m for aircraft certificated as
‘super fail-passive’ is removed. 175 m will now be required for DHs down to 50 ft. It is understood that this
provision was applicable to a single aircraft type that is no longer in production.
As the equipment of super fail-passive has been demonstrated as suitable for use down to 150 m, operators
with such aircraft could consider applying for an AltMoC.
The minimum RVR for DH below 50 is 125 m in the current rules, based on a fail-passive roll-out system; this has
been retained but based on input from an aircraft manufacturer, a provision has been inserted to allow a
minimum RVR of 75 m where this has been demonstrated during the equipment certification process.
The new ICAO (Annex 6) definition: Category III (Cat III): a decision height lower than 30 m (100 ft) or no decision
height and an RVR less than 300 m or no RVR limitation; AWO Manual will talk about fail-passive and fail-
operational CAT III and the associated values similar to the European rules.