Appendix A — Guidance on
classification of Failure Conditions.
ED Decision 2019/011/R
The following table provides guidance for the classification of failure conditions, based on a generic assessment of the risks related to the execution of the flight procedure as defined in the ICAO navigation specification.
As it is not possible for EASA to consider specific aspects of a particular design or particular mitigations, EASA will consider the outcome of a functional hazard assessment (FHA) applied to the specific design. If no FHA is provided, the higher of the classification is applied.
|
Type of
operation |
Continuity
/ Integrity |
Classification
of Failure Conditions |
|
RNP 11, RNP 2, RNP 4, RNP 0.3 |
Continuity (Loss) |
Major |
|
Integrity (Erroneous) |
Major |
|
|
Advanced RNP, RNP APCH |
Continuity (Loss) |
Major2,3 |
|
Integrity (Erroneous) |
Major/Hazardous2 |
|
|
RNP AR APCH, RNP AR DP (RNP ≥ 0.3 NM) |
Continuity (Loss) |
Major/Hazardous3 |
|
Integrity (Erroneous) |
Major/Hazardous |
|
|
RNP AR APCH (RNP < 0.3 NM) |
Continuity (Loss) |
Hazardous3 |
|
Integrity (Erroneous) |
Hazardous |
1 In the RNP 1 navigation specification of the PBN Manual, the loss of function is classified as ‘minor’. Due to EASA’s decision to group all the basic requirements for lateral navigation together in Subsection 2 and not to grant specific approval for each separate navigation specification, but for the entire bundle, the failure condition has been set to ‘major’. Applicants that intend to apply for RNP 1 approval only with an intended classification of the loss of function as ‘minor’ are encouraged to consult EASA as early in the process as possible to discuss the applicable certification criteria.
2 The loss of function during the missed approach may be classified as a ‘minor’ failure condition and the integrity may be ‘major’.
3 The loss of VNAV during the final approach may be classified as a ‘minor’ failure condition, provided that lateral navigation is not affected.
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