getting to grips with CAT II CAT III operations(57)

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. within one hour for twins . within two hours for quads . within the maximum approved diversion time for aircraft qualified for
ETOPS, but not more than 2 hours (JAR OPS). Above time is determined at the one engine inoperative speed.
7.2 LVTO with RVR between 400m and 150m
The minimum RVR in this range of value is a function of the aircraft category and of the runway equipment.
A300, A310, A319, A320, A321, A330-200, -300 and A340-200, -300 are in category C.
For this aircraft category, the JAR OPS gives the following minima.
Ground facilities  RVR 
Nil (day only)  500m 
Runway edge lighting and/or centerline marking (for night, edge and runway end lights are required)  250m 
Runway edge and centerline lighting  200m 
Runway edge and centerline lighting and multiple RVR information  150m 

Note:  The requested RVR value representative of the initial part of the takeoff run can be replaced by pilot assessment.
No operational approval is required to perform LVTO with these minima according to JAR OPS1.
7.3  LVTO with RVR between 150m and 125m
JAR OPS 1 has provision to further reduce the minimum RVR provided the Airline has obtained an operational approval to conduct LVTO with this minima.
Among the conditions which must be met, one is related to the aircraft type.
A visual segment of 90m is required from the cockpit during the takeoff run with the minimum RVR.
The visual segments for RVR 125m are given in the table below for each Airbus model:
Airbus model  Visual segment 
A300  105,5m 
A310  106m 
A319, A320 , A321  112,5m 
A330, A340  108,5m 

Consequently, all Airbus models have the capability to be operated with 125m RVR at takeoff.
Additional requirements are as follows:
.  Low Visibility Procedures are in force
.  High intensity runway centerline lights spaced 15m or less and high intensity edge fights spaced 60m or less are in operation
.  The 125m RVR value has been achieved for all of the relevant RVR reporting points
.  Flight crewmembers have satisfactorily completed training in a simulator approved for this procedure.
7.4 LTVO with RVR between 125m and 75m
JAR OPS 1 has provision to authorize takeoff with RVR between 125m and 75m provided the aircraft is equipped with an approved lateral guidance system and an operational approval has been obtained by the operator.
Such systems have been certified on Airbus Aircraft and have been installed in option:
WGD Windshield Guidance Display (A310, A300-600) HUD Head-Up Display (A330, A320, A319, A321) PVI ParaVisual Indicator (A320, A330, A340)
All these systems provide the pilot flying with a lateral guidance using LOC signal.
This kind of display allows the pilot to follow the guidance orders and to continue the monitoring of external visual cues (centerline lights).
　
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