AFM RNP value in OPS approved RNP normal conditions TBD by the Airline
The airline has to conduct a Flight Operational Safety Assessment (FOSA) to determine, in the specific environment of the intended operation , the level of RNP adequate to cope with the abnormal conditions (engine failure, system failures).
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3. The RNP Concept
Getting to grips with RNP AR
The EASA objective is to facilitate the operational approval looking after the operational readiness during the RNP certification of the aircraft.
OPS evaluation
Airworthiness Evaluation
AFM RNP values for
HMI evaluation
normal and
Crew work load
abnormal
Contingency
conditions
procedures
To be used for
Failures conditions
OPS approval
The Flight Manual provides approved data for RNP in normal and abnormal conditions. The RNP values in abnormal conditions with the associated training requirements can be used by the airline to significantly reduce or replace the need to perform a FOSA.
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4. Certified RNP capability
4. CERTIFIED RNP CAPABILITY
4.1. THE “BASIC” RNP CERTIFICATION BASED ON MASPS ED75/DO236
For Airbus aircraft with GPS, the compliance to the performance requirements of the MASPS ED75/DO236 have been demonstrated as specified in the AFM for the following typical RNP values.
AP OFF, FD ON AP ON
Terminal Area 0.51 NM 0.5 NM
Approach 0.3 NM 0.3 NM
For this initial basic RNP certification, the FTE was not determined in flight. Instead the default FTE values accepted without demonstration by DO208 (Minimum Operational Performance Standards for Airborne Supplemental Navigation Equipment Using Global Positioning System) were used.
The NSE measured in flight tests and the above default FTE values were used in the equation (1) to demonstrate that the TSE is lower than the RNP value given in the AFM.
For aircraft without GPS, only the accuracy performance criteria of MASPS ED-75/DO-236 have been demonstrated. No RNP capability has been claimed in the AFM, albeit the FMS can provide a certain level of integrity, due to series of reasonableness checking before being accepted for FMS position up-dating.
GPS is the only Navigation sensor enabling the rigorous demonstration of containment integrity, so both basic RNP and RNP AR require Navigation solutions based exclusively on GPS.
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4. Certified RNP Capability
Getting to grips with RNP AR
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