getting to grips with CAT II CAT III operations(56)

6.4.5  AUTOMATIC LANDINGS IN CAT I OR BETTER WEATHER CONDITIONS
During the operational demonstration period or for training, automatic landings canbe performed on runways not promulgated for CAT II / CAT III operation or without enforcing Low Visibility Procedures. This can be done on a selected number of runways in addition to those qualified for CAT II / CAT III operations.
The airline has checked the suitability of these selected runways for automatic landings.
Criteria to qualify crews for automatic landings in CAT I or better weather conditions have been established.
Special procedures have been developed for this kind of operation and are published in the operation manual.
6.5 OPERATING MINIMA
6.5.1 CAT II AUTOMATIC APPROACH
The DH is determined as the higher of:
. the published OCH,
. the minimum DH applicable to the flight crew,
. 100ft.

The minimum RVR is a function of the DH and is indicated in the table below.
DH  RVR 
100-120ft  300m 
120-140ft  400m 
140 ft and above  450m 

Touchdown transmissiometer must indicate a RVR above the listed minimum.
The visual segment associated with DH = 100ft and RVR 300m has been evaluated to be 170m.
6.5.2 CAT III AUTOMATIC APPROACH AND LANDING
CAT III A WITH 50ft DU For CAT III A operations, the minima are: . minimum DH 50ft
. minimum RVR 200m Touchdown transmissiometer must indicate a RVR above listed minimum. The visual segment associated with DH=50ft and RVR 200m has been evaluated to
be 120m.
Procedures recommend the use of both APs, but if one is not operative, CAT III SINGLE can be performed with the same minima. If roll-out cannot be used or is inoperative, CAT III A automatic approach and
landings can still be conducted provided that the AP is disconnected at touch down.
CAT III B automatic approach and landing
For CAT III B operations the minima are:
The minimum DH is 17 ft.

The minimum RVR is 100 m.

For CAT III operations the RVR indicated by both touchdown and mid- runway transmissometers must be above the applicable minima. The visual segment associated with DH=17ft and RVR 100m has been evaluated to
be 60m.
CHAPTER 7
7. LOW VISIBILITY TAKEOFF (LVTO)
7.1 GENERAL
7.2 LVTO with RVR between 400m & 150 m
7.3 LVTO with RVR between 150m & 125 m
7.4 LVTO with RVR between 125m & 75 m
7.1 GENERAL
Takeoff with RVR less than 400m is considered as LVTO by JAR OPS 1.
The maximum RVR at Takeoff is quite independent of the aircraft type and aircraft equipment except for very low RVR.
The Takeoff minima is mainly determined by the airport installation (runway lighting system, RVR measurement system, ...).
When weather conditions are more severe than the landing minima, a takeoff alternate is normally required:
　
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