IEEE - Aerospace and Electronic Systems - August 2023 - 6
Airbus A32x Versus Boeing 737 Safety Occurrences
Figure 3.
Timeline and comparison for relevant Boeing and Airbus aircraft. Notes (): Maximum seating is as certified, A321NEO range is XLR,
MAX is 7, 8, 9, and 10 in order, with the 8 and 9 having the same range.
data, this is described by the cross-sectional component,
the two aircraft manufacturers, and several key variables.
Each of these variables, occurrence type, occurrence category,
phase of flight, injury level, and number of fatalities,
has two or more nominal values. The distribution of these
values in terms of their counts across a variable is then
compared, either to some expected distribution (a goodness
of fit test) or between cross-sectional elements (a test
of independence), where the samples between Airbus and
Boeing are tested for their independence, the appropriate
chi-squared test was utilized [23]. This involved counting
the relevant number of occurrences with each value, in
each variable, for each manufacturer. The distribution of
each variable was then compared between the manufacturers.
It should be noted that Boeing has higher counts,
and as such, data presentation utilizes the relative proportion,
noting the total count of each, such that the distribution
of proportions can be directly compared visually. The
relative proportions between Airbus and Boeing occurrences
were compared to an expected distribution based
on the total of all Airbus and Boeing occurrences, a goodness
of fit test was utilized [24]. This was used for the
number of fatalities (the count), where Airbus and Boeing
became the nominal values. Two expected distributions
were tested; an even split relative to the total number of 1)
occurrences and 2) accidents. This was selected as Boeing
being utilized more in terms of operations, will unfairly
have a higher number of fatalities. The data presentation
here utilized the observed count relative to the expected
proportion, because each manufacturer is being compared
Figure 4.
Proportions of all safety occurrences coded by the type of occurrence.
Total counts: Airbus ¼ 2826, Boeing ¼ 2593.
6
Figure 5.
Proportions of all safety occurrences coded by ICAO occurrence
category. Total counts: Airbus ¼ 843, Boeing ¼ 943.
IEEE A&E SYSTEMS MAGAZINE
AUGUST 2023
IEEE - Aerospace and Electronic Systems - August 2023
Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - August 2023
Contents
IEEE - Aerospace and Electronic Systems - August 2023 - Cover1
IEEE - Aerospace and Electronic Systems - August 2023 - Cover2
IEEE - Aerospace and Electronic Systems - August 2023 - Contents
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IEEE - Aerospace and Electronic Systems - August 2023 - Cover3
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