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4.10 CAT II / CAT III ILS approaches – Salient features:
CAT II/CAT III ILS approaches are carried out making use of automatic landing system. CAT II automatic approaches can be followed by a manual landing (although the standard operating procedure is to be use the autoland capability).
In CAT III weather conditions, automatic landing usually is mandatory.
Consequently, the terms “Visual reference” do not have the same meaning for CAT II and CAT III approaches.
For CAT II approaches, having visual references means being able to see to land (i.e. being able to land manually)
For CAT III approaches, having visual references means being able to see to verify the aircraft position.
For CAT III with No DH, no visual cue is specified but it is a recommended practice for the PF to look for visual references before touchdown; these visual cues are later used for monitoring the AP guidance during the rollout phase.
During automatic approach and landing, the flight path is fully monitored by the AP (autoland warning), and supervised by the PNF (excessive deviation callouts).
The PF can concentrate his/her attention on the acquisition of visual references; progressively increasing his/her external scanning as the DH is approached. When an approach is conducted close to the minimums, the time available for making the transition from instrument references to visual references is extremely short; the PF must therefore dedicate his/her primary attention to the acquisition of visual references.
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A-319
CONDITIONS: - FLAPS FULL PITCH ANGLE GLIDE PATH ( 0 ) A B TOUCHDOWN POINT C
-ILS ANTENNA AT 50 FT AT THRESHOLD 408 205 349m 1145 ft 114m 375 ft 235m 771 ft
- NO FLARE 503 30 291m 954 ft 100m 329 ft 191m 625 ft
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A-319
Chapter-4 DECISION HEIGHT AND VISUAL REFERENCES Page-32
A-320
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A-320
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A-321
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A-321
CAT III CAT II
H 15 ft (θ = 4.50) 50 ft (θ = 4.1) 100 ft (θ = 4.10)
VISUAL SEGMENT 60 m (197 ft) 120 m (394 ft)
A 36 ft 71 ft 121 ft
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