4.2. “UNLIMITED” RNP AR WITH FULL RNP AR CERTIFICATION
The RNP AR certified capability is stated in the AFM with a reference to a document called ACD (Airworthiness Compliance Document).
The ACD is not distributed automatically. The airlines, which envisage an RNP AR project will need to request it to Airbus.
The ACD has been developed in response to specific requests from the Airworthiness Authorities to provide all the assumptions, limitations and supporting information necessary to conduct safe of RNP AR operations.
4. Certified RNP capability
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The ACD includes the required aircraft definition for “unlimited” RNP AR operations.
The main modifications for RNP AR are:
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The L/DEV indication on PFD and the XTK error on ND with 2 digits after the dot ,
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The triple click audio warning in case of loss of NAV or FINAL APP modes (SA),
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The TAWS/EGPWS with peaks mode and capability to use GPS position alone if both FMGC are failed,
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NAV mode automatic re-engagement instead of GA TRACK upon GA initiation.
4.2.1. THE DEMONSTRATED RNP PERFORMANCE DURING CERTIFICATION
The ACD provides the RNP performance in normal and abnormal conditions achieved during flight and simulator tests.
For example the following performance was achieved with the SA Airbus aircraft in normal conditions (no failure):
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Demonstrated NSE: 0.04 NM 95%, NSE_CT * : 0.03 NM 95%
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Demonstrated FTE in FINAL APP mode: 0.07 NM 95%.
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Demonstrated TSE in FINAL APP mode: 0.08 NM 95%.
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Demonstrated FTE in NAV or APP NAV mode: 0.12 NM 95%
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Demonstrated TSE in NAV or APP NAV mode: 0.13 NM 95%
And the following performance has been demonstrated for the A330 in normal conditions (no failure):
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Demonstrated NSE_CT*: 0.01 NM 95%, NSE_AT*: 0.05 NM 95%
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Demonstrated FTE in FINAL APP mode: 0.04 NM 95%.
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In FINAL APP mode:
Demonstrated TSE_CT* = 0.04 NM and TSE_AT* = 0.06 NM 95%.
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Demonstrated FTE in NAV or APP NAV mode: 0.07 NM 95%
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In NAV or APP NAV mode:
Demonstrated TSE_CT* = 0.07 NM and TSE_AT* = 0.06 NM 95%
(*) CT: in cross-track direction, AT: in along-track direction
4. Certified RNP Capability
Getting to grips with RNP AR
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Typically the following RNP values have been demonstrated in normal conditions (no failure):
RNP AR AP ON AP OFF with FD
Normal operations NAV mode FINAL APP mode
RNP SA aircraft 0.17 0.1 0.3
RNP A330 0.1 * * 0.3 in missed approach until implementation of automatic NAV mode reengagement at GA initiation 0.3
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