getting to grips with CAT II CAT III operations(18)

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TASK SHARING
CM1 and CM2 task sharing must be clearly defined in the Airline Operations Manual. The task sharing proposed here below is one example of how to conduct a CAT II/III approach. Whatever the Airline policy, the AFM procedures must be observed.
For the Airbus Training Center the recommended task sharing for a CAT II / CAT III approach is that CM1 is PF and CM2 is PNF. The workload is distributed in such a way that the PF primary tasks are supervising and decision making, and the PNF primary task is monitoring operation of the automatic system.
In summary the tasks are shared as follows:
All CAT II and CAT III operations  CM1  --- has hands on controls and thrust levers throughout the approach, landing or go-around; makes FCU selections (if any); takes manual control in the event of AP disconnection ; 
- monitors flight instruments. 

Approaching DH:
-starts to look for visual references, progressivelyincreasing external scanning as DH is approached. If no DH procedure is used, the PF will nevertheless look for visual references.
At or before DH (if his decision is to continue): -calls "LANDING" ; -scans mostly head-up to monitor the flight path and flare
(in CAT II or CAT III A) or the position on the runway (in
CAT IIIB) by visual references;
-monitors thrust reduction or for A320/A330/A340, at "RETARD" call-out, sets thrust levers to idle ;
-selects and controls reverse thrust;
-disengages autopilot when taxi speed is reached.
CM2 -monitors flight instruments head-down throughout approach, go-around or landing until rollout is completed; -calls any deviation or failure warning ; -calls barometric heights as required, and monitors auto call-out or calls radio heights including "100 above" ; -monitors FMA and calls mode changes as required.
At DH (identified by aural and visual warning):
-if decision is not announced by CM1, calls "MINIMUM"; -if no response from CM1, initiates a go-around.
CAT III CM1  - if no failure by AH, calls "LANDING"; 
operations without  - monitors flare by flight instruments; 
DH  - monitors lateral guidance during flare by yaw bar on PDF ; 
- monitors automatic ground roll by scanning alternately instruments and external references. 

All CAT II and CAT III operations
IF DECISION IS TO GO AROUND: CM1 -calls "GO-AROUND – FLAPS"; -initiates go-around by setting thrust levers to TOGA (or triggering GO levers for A300/A310); -monitors rotation on PFD; -checks positive climb (V/S and RA); -commands configuration changes.
CM2 -Standard Operating Procedures
VISUAL REFERENCES
Operations with DH
It should be stressed that the DH is the lower limit of the decision zone during which, in limiting conditions, the CM1 will be assessing the visual references. CM1 should come to this zone prepared for a go around but with no pre-established judgement. CM1 should make a decision according to the quality of the approach and the way the visual references develop as DH is approached.
　
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