.  
In case of an abnormal condition: . Abnormal procedure down to STATUS; . Normal checklist ( as applicable ); and, . Resuming abnormal procedure.

These actions should be accomplished in accordance with the published task sharing, crew coordination principles and phraseology.
Critical or irreversible actions, such as selecting an engine fuel lever / master switch or a fuel isolation valve to OFF, should be accomplished by the PNF but require prior confirmation by the PF (i.e., confirmation loop).

Know your FMA guidance at all times
The FCU and FMS CDU and keyboard are the prime interfaces for the crew to communicate with aircraft systems (i.e., to arm modes or engage modes and to set targets).
The PFD (particularly the FMA and target symbols on speed scale and altitude scale) and ND are the prime interfaces for the aircraft to communicate with the crew, to confirm that the aircraft systems have correctly accepted the flight crew’s mode selections and target entries.
Any action on FCU or on FMS keyboard and line-select keys should be confirmed by cross-checking the corresponding annunciation or data on PFD and/or ND.
At all times, the PF and PNF should be aware of:
.  
Modes armed or engaged;

.  
Guidance targets set; and,

.  
Mode transitions or reversions.

Cross check the accuracy of the FMS with raw data
When within navaids coverage area, FMS navigation accuracy should be cross-checked against navaids raw-data (unless aircraft is GPS-equipped and GPS PRIMARY is available).
FMS navigation accuracy can be checked by:
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Entering a tuned VOR-DME in the bearing/distance ( BRG / DIST TO ) field of the appropriate FMS page;

.  
Comparing the resulting FMS DIST TO reading with the DME distance read on the RMI (or on ND, as applicable);

Operations Golden Rules
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AIRBUS INDUSTRIE
    Flight Operations Support
.  Checking the difference between FMS DIS TO and DME distance against the criteria applicable for the flight phase (as defined in SOPs).
If the required FMS navigation accuracy criteria are not achieved, revert from NAV mode to selected heading mode with reference to navaids raw-data.
Select PF ND to ARC or ROSE mode. If no map shift is observed, PNF may keep ND in MAP mode, with display of speed constraints and/or altitude constraints, for enhanced horizontal and vertical situational awareness.
One head up at all times
Significant changes to the FMS flight plan should be performed by PNF and cross-checked by PF, after transfer of controls, in order to maintain one head up at all times for supervising the progress of the flight and aircraft systems.
When things don’t go as expected, Take Over
If the aircraft does not follow the desired vertical flight path / lateral flight path or the selected targets, and time does not permit analyzing and solving the observed behavior, revert without delay from:
.  
FMS guidance to selected guidance; or from,

.  
Selected guidance to hand flying.

                                                                                       Getting to Grips with                                            Approach-and-Landing Accidents Reduction
　
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