getting to grips with RNP AR Required Navigation Performance(28)

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The crew will insert the RNP for departure as REQUIRED ACCURacy on the MCDU PROG page. To avoid unsatisfactory FMS radio-update in case of loss of GPS PRIMARY the radio navaids will be deselected, as requested by the Airline documentation. 
7. RNP AR Operations and Training
Getting to grips with RNP AR

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7.2.2.2       BEFORE TAKEOFF
During taxi the flight crew will select the RNP P/B to display the L/DEV on PFD. The L/DEV indication will remain centered on ground.
Note: With some recent aircraft definition the L/DEV is automatically selected, no RNP P/B is installed.
TAWS/EGPWS terrain mode will be selected by both pilots unless weather radar is required
on one side.
The crew will check on FMA that the NAV mode is armed.
On the MCDU PROG page the crew will check that GPS PRIMARY is available and on the
GPS MONITOR page, that both GPS sensors are in NAV mode.

7.2.2.3      TAKEOFF AND CLIMB OUT
During take roll the L/DEV remains centered (-may be temporarily out of view between 50 and
90kt) . After takeoff when reaching 100ft the NAV mode engages and the PF  will call AP ON.
Both pilots will monitor the L/DEV.
The departure is quite standard, but as required by the departure flight path design, the crew
will monitor that the correct speed constraints are taken into consideration or will select the
appropriate speed on FCU to fly the RF legs. 
The aircraft clean up must be adapted to the speed constraints. 
Reaching the transition altitude, the L/DEV indication disappears.

7.2.3 LATERAL AND VERTICAL DEVIATION MONITORING
There is no automatic callout or alert when the L/DEV exceeds the budget allocated to ensure that containment is achieved.  The crew must continuously monitor the displayed L/DEV on PFD against the limit specified for a given RNP value.  This maximum lateral budget is associated to the RNP value entered as REQUIRED ACCURacy in  the MCDU. The maximum  L/DEV budget and its associated REQUIRED ACCURacy are defined for different RNP value in the table below.
MAX L/DEV 
0.2 – 0.3  0.2 – 0.3  2 DOT 
0.15 – 0.19  0.15 – 0.19  1.5 DOT 
0.1 – 0.14  0.1 – 0.14  1 DOT 

The operator must establish crew procedures to require the PNF to  make callout so that the
L/DEV limit is not exceeded unnoticed.
If an abnormal increase of the L/DEV is observed , the AP should be disconnected and crew
should take corrective actions. In approach  a GA should be initiated. 

7. RNP AR Operations and Training

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A discrepancy between PF and PNF L/DEV display may be the result of an FMS position
error.
If the wrong FMS cannot be identified immediately, a go around must be initiated unless
　
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