getting to grips with RNP AR Required Navigation Performance(26)

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7.1.3 NAVIGATION DATABASE CODING VALIDATION
The validation of the Navigation Data Base (NDB) coding is essential  for RNP AR operations.  When the RNP AR procedure is first introduced in the NDB or if any modification of the NDB affecting the concerned  RNP AR procedure coding is made, the procedure must be validated using a flight simulator or an equivalent training tool (MFTD) fitted with software representative of the aircraft FMGC.   This is an important aspect of the NDB integrity check even if the NDB is obtained from an “approved” supplier (DO-200A / ED-76 or AC 20-153).  As the RNP AR procedure needs to be coded in the airline’s FMS NDB to conduct the operational evaluation, it is the right time to perform this NDB validation.
7.1.4 NAVIGATION DATABASE CONTROL
Means to check that RNP AR (or SAAAR) procedures are not modified at each AIRAC cycles
need to be implemented. 
Usually automatic means are used to check that RNP AR procedure coding was not modified
compared to the original validated procedure.
The operator must in addition implement a process to ensure that the FMS are loaded with up
to date NDB.
The flight crew, as usual will also verify that the NDB is up-to-date.

7. RNP AR Operations and Training
Getting to grips with RNP AR

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7.1.5 TAWS TERRAIN DATABASE AND FLIGHT PATH ADEQUACY
The instrument procedure design for RNP AR (SAAAR) operations must be assessed for the absence of nuisance warnings and cautions when flying on the nominal flight path. This assessment should be part of the operational evaluation of the procedure including simulator tests and as necessary a verification during demonstration flight(s). Nuisance alerts can be minimized through: 
-Adaptation of the Terrain Data Base,
-
 Redesign of the instrument procedure,

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 Inclusion of appropriate speed constraints.

7.2. RNP AR (SAAAR) OPERATIONAL PROCEDURES
We will review in this chapter the main steps in the preparation and the conduct of RNP AR operations. This review is generic, and the reader should keep in mind that adaptations may be required as RNP AR operation is, as per definition, specific to each destination.
7.2.1 FLIGHT PREPARATION
In addition to the usual preparation, which is done before any flight, the following topics need to be addressed:
.  
The aircraft RNP AR certification status and the required equipment to start an RNP AR procedure

.  
The GPS PRIMARY availability at the ETA or ETD 

.  
The navigation database is up-to-date and the RNP AR procedures planned to be flown are authorized by the airline.

.  
The weather forecast are compatible with the minima listed for the approved RNP value.

7.2.1.1     REQUIRED EQUIPMENT
The list of required equipment should be established during the operational evaluation and the approval process, considering the available operational mitigation means for each individual procedure. The following list of equipment should be considered to start an RNP AR procedure in a demanding environment:
　
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