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Occurrence Category Taxonomy

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Article Information
Category: ICAO ADREP ICAO ADREP
Content source: ICAO ICAO
Content control: ICAO ICAO

Definition

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).

Terms

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.

ADREP occurrence category taxonomy terms
Primary (15)
Term Acronym
Abnormal runway contact ARC
Birdstrike BIRD
Controlled flight into or toward terrain CFIT
Collision with obstacle(s) during take-off and landing CTOL
Fire/smoke (non-impact) F-NI
Ground Collision GCOL
Loss of control - inflight LOC-I
Airprox/ ACAS alert/ loss of separation/ (near) midair collisions MAC
Ground Handling RAMP
Runway excursion RE
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
Undershoot/overshoot USOS
Secondary (18)
ATM/CNS ATM
Loss of control - ground LOC-G
Turbulence encounter TURB
Fuel related FUEL
Aerodrome ADRM
Low altitude operations LALT
Fire/smoke (post-impact) F-POST
Windshear or thunderstorm WSTRW
Icing ICE
Evacuation EVAC
Security related SEC
Cabin safety events CABIN
Abrupt manoeuvre AMAN
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

Relations with other taxonomies

IATA maintains a taxonomy for accidents. The terms used inside that taxonomy can be mapped to the primary terms of the ADREP occurrence category taxonomy, bearing in mind that the ADREP occurrence category taxonomy also covers incidents, whereas the IATA taxonomy only concerns end states meaning accidents.
Multiple categories of one taxonomy sometimes match one category of the other taxonomy, but still allow comparison.

ADREP versus IATA accident taxonomy
ADREP Term (15) IATA Term (11)
Controlled flight into or toward terrain Controlled flight into Terrain
Abnormal runway contact Gear-up landing / Gear Collapse
Hard Landing
Tail Strike
Ground Collision Ground damage
Ground Handling
Birdstrike In-flight damage
Fire/smoke (non-impact)
Collision with obstacle(s) during take-off and landing
System/component failure or malfunction [non-powerplant]
Powerplant failure or malfunction
Loss of control - inflight Loss of Control In-Flight
Airprox/ ACAS alert/ loss of separation/ (near) midair collisions Mid-air collision
Runway - wildlife presence Runway collision
Runway incursion - vehicle, aircraft or person
Runway excursion Runway excursion
Undershoot/overshoot Undershoot

Rules

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".

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