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Occurrence Categories
In order to assist in the identification of particular safety issues, one or multiple occurrence categories were as‑
signed to Aerial Work Helicopter accidents involving EASA MS and is shown in Table 20. This was done using the
CICTT occurrence categories, which are listed in Appendix 1.
Figure 29 shows the distribution of accidents and serious incidents per occurrence category. In general, the num‑
bers in 2014 were lower than the average of the preceding decade. As with Aerial Work Fixed Wing, low altitude
operations (LALT) also features as a risk area within Aerial Work Helicopter, again due to the unusual nature of
some of the activities in the different operational sectors. This analysis by occurrence category provides a basic
overview of the risk areas attached to Aerial Work Helicopters, however a more detailed analysis of the different
sectors will be carried out to enable the development of sector‑specific safety risk portfolios.
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Table 20:
Aerial work occurrences, accidents and serious incidents per occurrence category
Occurrence Category
Accidents and SIs
2004-2013 average
2014
LALT: Low altitude operations
9.3
3
LOC‑I: Loss of control - inflight
7.0
4
EXTL: External load related occurrences
4.2
2
SCF‑PP: Powerplant failure or malfunction
3.9
1
OTHR: Other
3.1
1
SCF‑NP: System/component failure or malfunction [non‑powerplant]
2.0
1
F‑POST: Fire/smoke (post‑impact)
2.0
0
FUEL: Fuel related
1.4
0
CTOL: Collision with obstacle(s) during take‑off and landing
1.2
1
ARC: Abnormal runway contact
1.0
2
LOC‑G: Loss of control - ground
1.1
0
CFIT: Controlled flight into or toward terrain
0.9
0
UNK: Unknown or undetermined
0.6
1
AMAN: Abrupt maneuvre
0.6
0
TURB: Turbulence encounter
0.6
0
MAC: Airprox/ACAS alert/loss of separation/(near) midair collisions
0.4
0
RAMP: Ground Handling
0.2
1
GCOL: Ground Collision
0.3
0
UIMC: Unintended flight in IMC
0.2
0
WSTRW: Windshear or thunderstorm.
0.1
1
ADRM: Aerodrome
0.1
0
BIRD: Birdstrike
0.1
0
ICE: Icing
0.1
0
USOS: Undershoot/overshoot
0.1
0