12 CAT III OPERATIONS (EU-OPS 1)
CAT III operations are subdivided as follows:
a.
CAT IIIA: decision height lower than 100ft and RVR not less than 200m,
b.
CAT IIIB: decision height lower than 100ft or no decision height and RVR less than 200m but not less than 75m.
DECISION HEIGHT
For operations in which a decision height is used, an operator must ensure that the decision height is not lower than:
–
the minimum decision height specified in the Aircraft Flight Manual or equivalent documents,
–
the minimum height to which the precision approach aid can be used without the required visual reference,
–
the decision height to which the flight crew is authorized to operate.
Operations with no decision height may only be conducted if:
–
the operation with no decision height is authorized in the Aircraft Flight Manual,
–
the approach aid and aerodrome facilities can support such operations,
–
the operator has an approval for CAT III operations with no decision height.
NOTE: In the case of a CAT III runway it may be assumed that operations with no decision height can be supported unless specifically restricted as published in the AIP or by NOTAM.
Whether an aerodrome is CAT III A or B mainly depends on the lightning system installed in particular taxi lights with red stop bars etc. That's why many aerodromes chose CAT III A certification only as it's cheaper yet still allows a fully automated approach, landing and rollout even with NO DH. Taxi is another story.
