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This is the Incident Base for that period. Out of the
Incident Base, 127 unique events fell into categories A,
B, or C, or some combination of these categories. The
remaining 38 incidents did not fit any of the categories,
or there was insufficient data to classify them. These
are shown in the Inapplicable or Unknown row.
Because the number of Total Unique Incidents varies
from table to table, we decided to use the Incident Base
to calculate percent distributions for all data sets. By
calculating the percentages in this matter, we created a
common yardstick which can be used to compare the
data presented in the various charts.
Finally, all of the percentages shown were rounded to
whole numbers. In those cases where the number of
relevant incidents is very small (less than one-half of
one percent) the percentages round down to, and are
presented as, zero percent. Similarly, in those cases
where the number of reports in a category exceed 99.5
percent of the Incident Base, the result was rounded up
to, and is presented as, 100 percent.
Data Listing
Statistical Data Page
Year of Occurrence ................................ 28
Reporting Sources ................................. 29
Month of Occurrence ............................. 30
Weekday of Occurrence......................... 31
Time of Day of Occurrence .................... 32
Involved Facilities ................................... 33
Involved Airspaces ................................. 34
Anomalies (Top Level Categorization) ...... 35
Airborne Spatial Deviations & Conflicts 36
Ground Incidents .................................... 37
Non-Adherence to Rules & Reqmnts .... 38
Other Aircraft Anomalies ....................... 39
ATC Handling Anomalies ....................... 40
28 Issue Number 6
30,000
25,000
20,000
15,000
10,000
5,000
0
1987 1988 1989 1990 1991 1992 1993
Period of Occurrence Year Total Cumulative
Reported Incidents
1987
1988
1989
1990
1991
1992
1993
13,612
16,381
24,953
27,728
25,034
25,865
24,349
13,612
29,993
54,946
82,674
107,708
133,573
157,922 Incident Base
Reported Incidents
Year of Occurrence
Issue Number 6 29
70%
0%
Pilot/
Air Carrier
Reporters
Pilot/Air Carrier
Pilot/General Aviation
Pilot/Other
Controller
All Other
Total Unique Relevant
Incident Base
Pilot/
General Aviation
Pilot/
Other
Controller All Other
1993
1987 through 1993
60%
50%
40%
30%
20%
10%
Incidents % of Incident Base Incidents % of Incident Base
1993 1987 through 1993
Irrelevant or Unknown
15,215
6,953
843
1,214
242
24,310
24,349
39
100,538
44,942
5,465
6,552
1,039
157,765
157,922
157
64%
28%
3%
4%
1%
100%
100%
0%
62%
29%
3%
5%
1%
100%
100%
0%
Roughly 20 percent of these events were reported by more than one person, but the secondary
reporters were usually involved in the same incident, e.g., two pilots reporting the same NMAC.
Note:
Reported Incidents
Reporting Sources
30 Issue Number 6
0%
Jan
Month
January
Irrelevant or Unknown
15%
10%
5%
Incidents % of Incident Base Incidents % of Incident Base
1993 1987 through 1993
2,145
0
12,508
0
8%
0%
9%
0%
Incident Base 24,349 100% 157,922 100%
Total Unique Relevant 24,349 100% 157,922 100%
December 1,783 7% 12,330 8%
November 1,937 8% 12,979 8%
October 2,148 9% 13,877 9%
September 1,987 8% 12,851 8%
August 2,138 9% 14,161 9%
July 2,121 9% 13,934 9%
June 2,018 8% 13,531 9%
February 1,927 8% 12,041 8%
March 2,131 9% 13,693 9%
April 2,068 8% 12,892 8%
May 1,946 8% 13,125 8%
1993
1987 through 1993
Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
Reported Incidents
Month of Occurrence
Issue Number 6 31
Weekday
Monday
Incidents % of Incident Base Incidents % of Incident Base
1993 1987 through 1993
3,522 14% 22,251 14%
Saturday 3,010 12% 19,614 12%
Tuesday 3,491 14% 22,607 14%
Wednesday 3,689 15% 23,673 15%
Thursday 3,715 15% 24,259 15%
Friday 3,681 15% 24,443 15%
Irrelevant or Unknown 6 0% 208 0%
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