| Level Bust Statistics
Last Updated:
21 July 2010
Updates to the causal factors here The Scale of the Problem:
Level Busts & Losses of Separation by Year
NATS figures for 2004 to end of June 2010
Click to enlarge
Source: NATS Division of Safety Click here for an
explanation of the SSE Scheme
Level Busts reported
by NATS January 2006 to December 2008
| Category |
Level
Busts |
Percent of
UK Levelbust |
Percent of
UK Flights |
| Air
Transport |
1075 |
76.73% |
92.96% |
|
Private (non AOC) |
275 |
19.63% |
6.12% |
| Military |
51 |
3.64% |
0.92% |
| Total* |
1401 |
|
|
* Figures here don't tally with those in the
regions table which includes only those airlines present in the
league table
Biz jets continue to represent a
disproportionately high percentage of Level Bust reports.
Source of the data above is the UK Flight Database (UKFDB)
which contains flight planned data from a flight plan processing
system and actual flight details from a radar data processing system.
Aircraft which do not file a flight plan are not counted in the data.
Level Busts January 2006 to December 2008 by Region of Operator
| Region |
Level
Busts |
% of
Levelbusts |
% of
Flights |
| Asia |
65 |
7.17% |
2.54% |
|
Europe |
322 |
35.5% |
21.24% |
| Ireland |
101 |
11.13% |
15.08% |
| North
America |
73 |
8.05% |
5.95% |
| UK |
342 |
37.71% |
55.16% |
| Total |
907 |
|
|
Figures above are taken from the NATS level
bust league table, only events involving the airlines included in
the league table are included above therefore the total figure is
not equal to the total number of events in the year
12 Month Rolling Total to
April 2010
Click
to enlarge
Source: NATS Division of Safety
SSE Explanation here
The graph above shows that since Jan 08 level bust reports have
remained more or less steady at about 450 – 460 reports in the 12
month rolling total. Although this has been against a background of
traffic growth (until the recent downturn), the persistence of this error type confirms the need
for our continued focus on level busts.
This data has been taken directly from the
STAR database and has only been validated from 2004 onwards, however
from previous level bust data we can be confident that the
data presents a fair representation of the historical trend.
A detailed review of the reported level busts in 2004 and
2005 was undertaken in March 2006 following the highest number of
reported events in a single month in February. The summary of the work is that
we believe that in 2004 level busts increased (and so did the reporting of
them); however in 2005 the increase appears to be due to improved reporting by
controllers and pilots. However, even if the increase is due to better reporting
there are still too many level busts in the UK.
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