136 / 168
Annual Safety Review 2014
Internal Occurrence Reporting System
PAGE
134
´
´
Figure 54:
Number of IORS reports by aircraft category
0
500
1 000
1 500
2 000
2 500
3 000
Fixed wing -
Aeroplane
Rotorcraft -
Helicopter
No Category
Assigned
Fixed wing -
Glider
Fixed wing -
Other
Balloon
Fixed-wing
microlight
Rotorcraft -
Other
Airship
Number of Reports
Aircraft Category
Figure 54 shows the number of IORS reports by aircraft category. The dominance of fixed‑wing aeroplanes re‑
flects the relative proportion of such aircraft as the subject of reports submitted by organisations that report to
IORS. However, the precise proportions cannot be ascertained.
´
´
Figure 55:
Number of IORS reports by aircraft mass group
0
200
400
600
800
1 000
1 200
0-2 250 Kg
2 251
to
5 700 Kg
5 701
to
27 000 Kg
27 001
to
272 000 Kg
> 272 000 Kg
Unknown
Number of Reports
Aircraft Mass Group
Figure 55 shows the number of occurrences distributed by aircraft mass group, the largest number of occurrenc‑
es reported to IORS relate to aircraft in the 27001 – 272000 kg mass group, followed by 5701 – 27000 kg mass
group.