CAP 763

CAP 763 Aviation Safety Review 2005
Worldwide Fatal Accidents
3.14 Fatal accident rate involving eastern built aircraft
3.14.1 Eastern built aircraft (jets and turboprops combined) have generated 5% of flights
flown (and 6% of hours flown) by all jets and turboprops and were involved in 34% 4
of the fatal accidents. Figure 2.10 shows the fatal accident rates per million hours,
for eastern built aircraft, using a three year moving average, broken down by class of
aircraft.
Rate (per million hours)
12
10
8
6
4
2
Eastern built turboprops
All eastern built aircraft
Eastern built jets
0
1997 1998 1999 2000 2001 2002 2003 2004
3 year period ending :
Figure 2.10 Eastern built aircraft fatal accident rates
3.14.2 Within the eastern built aircraft subset, 61% of flights flown between 1995 and 2004
were performed by eastern built jets and 39% by eastern built turboprops. The
breakdown by hours flown between 1995 and 2004 shows that 67% were performed
by eastern built jets and 33% by eastern built turboprops. Over the same time period,
the breakdown between the fatal accidents is 36% involved eastern built jets and
64% involved eastern built turboprops.
3.14.3 The utilisation generated by eastern built aircraft is estimated to a greater extent than
that for the western built aircraft, therefore some caution should be applied to the
information relating to this class of aircraft.
3.14.4 A list of aircraft types considered to be 'eastern built aircraft' are listed in appendix 3.
3.15 Top five primary causal factors
3.15.1 Causal factors are events or items that the AAG judged to be directly instrumental in
the causal chain of events leading to the fatal accident. The causal factors used by
the AAG are listed in groups, such as 'Crew', and then sub-divided into specific
factors, such as 'Fatigue'. Where sufficient information allowed, a single primary
causal factor was allocated to an individual accident.
3.15.2 A primary causal factor was allocated to 85% of the jet and turboprop fatal accidents
that occurred between 1995 and 2004. In the remaining 15% of fatal accidents,
insufficient information was available to allocate a primary cause. The accidents were
analysed in terms of the higher level causal factor grouping. These groupings of
primary causal factors are shown in Figure 2.11.
4. One of the fatal accidents was a mid air collision involving an eastern built aircraft and a western built aircraft. Mid-air
collisions are normally considered as one accident but, when the accidents are broken down by class of aircraft, there
will be double counting if the individual components are summed back together.
8 August 2006
Chapter 2 Page 10