To review two or three pages of status messages: The PNF should release the STS pushbutton for less than two seconds, then press and hold it again.
A double ECAM screen configuration can be recovered using the ECAM/ND switching selector:
? If the Captain is the PNF, the switch should be set to "CPT".
? If the First Officer is the PNF, the switch should be set to "F/O".
The applicable ND screen will then display the second ECAM image. DMC FAILURES
In case all of the ECAM DMC channels fail, each flight crewmember may display the engine standby page on their respective ND (generated by the DMCs’ EFIS channel).
ECP FAILURE
In the case of an ECP failure, the CLR, RCL, STS, ALL and EMER CANCEL keys will continue to operate, because they are hardwired to the FWC/DMC. Therefore, the "ALL" key can be used to scroll all SD pages and display the desired one (by releasing the key, when the desired SD page appears).
FLUCTUATING CAUTION
Any fluctuating caution can be deleted with the EMER CANCEL pushbutton. When pressed, the EMER CANCEL pushbutton deletes both the aural alert, and the caution for the remainder of the flight. This is indicated on the STATUS page, by the "CANCELLED CAUTION" title. Any caution messages that have been inhibited via the EMER CANCEL pushbutton can be recalled by pressing and holding the RCL key for more than three seconds.
The EMER CANCEL pushbutton inhibits any aural warning that is associated with a red warning, but does not affect the warning itself.
USE OF SUMMARIES
Applicable to: ALL
1 GENERAL
Summaries consist of QRH procedures, and are designed to assist the flight crew to manage applicable actions, in the event of an EMER ELEC CONFIG or a dual hydraulic failure.
In any case, ECAM actions should be applied first (actions and STATUS review). The PNF should refer to the applicable QRH summary, only after announcing: "ECAM ACTIONS COMPLETED".
When a failure occurs, and after performing the ECAM actions, the PNF should refer to the "ACTUAL LANDING DISTANCES WITH FAILURE WITHOUT REV" table of the summary, to determine the new landing distance.
 

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

As mentioned, the distances provided in the summary do not take into account the credit of the reverse thrust. However, if necessary, the flight crew can still compute an ACTUAL LANDING DISTANCE WITH REV by referring to the QRH part 2.
Then, the PNF should check in the "CRUISE" section of the summary if an "APPR COR" appears in the VAPP formula.
Two different cases are possible:
‐ There is no "APPR COR", and the decision to divert or not can be taken considering the landing distance (with failure) already computed,
‐ There is an "APPR COR". In this case, the PNF should refer to the VAPP computation method (QRH part 2) in order to determine whether an "Additional Factor" is applicable. The decision to divert, or not, should be taken considering the resulting landing distance with failure.
　
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