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Some selectors or pushbuttons (including the ENG MASTER switch, FIRE pushbutton, IR, IDG and, in general, all guarded switches) must be completely crosschecked by both the PF and PNF, before they are moved or selected, to prevent the flight crew from inadvertently performing irreversible actions.
To avoid mistakes in identifying the switches, Airbus’ overhead panels are designed to be uncluttered. When the ECAM requires action on overhead panel pushbuttons or switches, the correct system panel can be identified by referring to the white name of the system on the
side of each panel. Before performing any action, the PNF should keep this sequence in mind: "System, then procedure/selector, then action" (e.g. "air, crossbleed, close"). This approach, and announcing an intended selection before action, enables the PNF to keep the PF aware of the progress of the procedure.
 

  OPERATIONAL PHILOSOPHY
ECAM
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

It is important to remember that, if a system fails, the associated FAULT light on the system pushbutton (located on the overhead panel) will come on in amber, and enable correct identification.
When selecting a system switch or pushbutton, the PNF should check the SD to verify that the selected action has occurred (e.g. closing the crossbleed valve should change the indications that appear on the SD).
Crew Coordination
 
 

  OPERATIONAL PHILOSOPHY
ECAM
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

1. The PNF should review the overhead panel and/or associated SD to analyze and confirm the failure, prior to taking any action, and should bear in mind that the sensors used for the SD may be different from the sensors that trigger the failure.
2. In case of a failure during takeoff or go-around, ECAM actions should be delayed until the aircraft reaches approximately 400 ft, and is stabilized on a safe trajectory. This is an appropriate compromise between stabilizing the aircraft and delaying action.
3. When the ECAM displays several failures, the sequence (action, then request and confirmation, before clearance) should be repeated for each failure. When all necessary actions are completed, amber messages and red titles will no longer appear on the E/WD.
4. When the ECAM displays several system pages, the sequence (request and confirmation before clearance) should be repeated for each system page.
5. The PF may call out "STOP ECAM" at any time, if other specific actions must be performed (normal C/L, or performing a computer reset). When the action is completed, the PF must call out: "CONTINUE ECAM".
6. When slats are extended, the SD automatically displays the STATUS, unless if the page is empty. The STS should be carefully reviewed, and the required procedure applied.
7. When ECAM actions have been completed, and the ECAM status has been reviewed, the PNF may refer to the FCOM procedure for supplementary information, if time permits. However, in critical situations the flight should not be prolonged only to consult the FCOM.
　
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