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Occurrence Category Taxonomy
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The ADREP Occurrence category taxonomy is a set of terms used by ICAO to categorize aircraft accidents and incidents and allow safety trend analysis on these categories. The ADREP Occurrence category taxonomy is part of the ICAO accident reporting system (ADREP).
The terms of this taxonomy are grouped into primary and secondary terms. Every occurrence should have attached a single primary occurrence category but may be attached in addition multiple secondary terms. For accidents, the primary term can be considered as the end state in comparison with the IATA taxonomy.
|Abnormal runway contact||ARC|
|Controlled flight into or toward terrain||CFIT|
|Collision with obstacle(s) during take-off and landing||CTOL|
|Loss of control - inflight||LOC-I|
|Airprox/ ACAS alert/ loss of separation/ (near) midair collisions||MAC|
|Runway - wildlife presence||RI-A|
|Runway incursion - vehicle, aircraft or person||RI-VAP|
|System/component failure or malfunction [non-powerplant]||SCF-NP|
|Powerplant failure or malfunction||SCF-PP|
|Loss of control - ground||LOC-G|
|Low altitude operations||LALT|
|Windshear or thunderstorm||WSTRW|
|Cabin safety events||CABIN|
|Loss of lifting conditions en-route||LOLI|
|Unintended flight in IMC||UIMC|
|Glider towing related events||GTOW|
|External load related occurrences||EXTL|
|Unknown or undetermined||UNK|
There are currently no rules set within this taxonomy or in relation with other ADREP taxonomies.
However, by the end of 2010 and following an analysis of the current ADREP data, ICAO may add rules to make the primary occurrence category mandatory and unique for occurences where the occurrence class is "accident".