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a) CAT II Operations
In CAT II operations the conditions required at DH to continue the approach are that the visual references should be adequate to monitor the continued approach and landing, and that the flight path should be acceptable. If both these conditions are not satisfied, it is mandatory to initiate a go around.
The visual references required at DH in CAT II operations to continue the approach may be any of the following:
. a segment of the approach light system,
. the runway threshold,
. the touchdown zone.

b) CAT III Operations
In CAT III operations with DH, the condition required at DH is that there should be visual references, which confirm that the aircraft is over the touchdown zone. Go around is mandatory if the visual references do not confirm this.
CAT III without DH
For this category of operation, the decision to continue does not depend on visualreferences, even though a minimum RVR is specified (see OPERATING MINIMA). It is nevertheless good airmanship to confirm aircraft position with available visual references. However, the decision depends only on the operational status of the aircraft and ground equipment. If a failure occurs prior to reaching the AH, a go-around will be made. A go around must nevertheless be performed if the autoland warning is triggered below AH.
LOSS OF VISUAL REFERENCES
A. Operations with DH - before touchdown
If the decision to continue has been made and the visual references subsequentlybecome insufficient (for the appropriate category), or the flight path deviates unacceptably, a go-around must be initiated (a go around initiated below the MABH, whether auto or manual, may result in ground contact).
NOTE: If the touchdown occurs after GA is engaged the AP remains engaged in
that mode, and ATHR remains in TOGA. Ground spoilers and auto-brake
are inhibited.
B. Operations with and without DH - after touchdown
If the visual references are lost after touchdown, a go-around should not be attempted.
The rollout should be continued with AP in ROLLOUT mode down to taxi speed.
FLIGHT PARAMETERS DEVIATION CALLS

PARAMETERS  IF DEVIATION EXCEEDS  CALL REQUIRED 
IAS  + 10kt - 5kt  "SPEED" 
RATE OF DESCENT  -1000ft/min  "SINKRATE" 
PITCH ATTITUDE  10° nose up 0°(A330/340), - 2.5° (A320/321)  "PITCH" 
BANK ANGLE  7°  "BANK" 
LOCALIZER  EXCESS  1/4 DOT (PFD)  "LOCALIZER" 
GLIDE SLOPE  DEVIATION WARNING  1 DOT (PFD)  "GLIDESLOPE" 

These calls would normally be made by the PNF and acknowledged by the PF. However, any crewmember that sees a deviation outside the above limits should make the appropriate call.
If any of these limits are exceeded approaching DH, a go-around should be considered.
　
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