Published Report (DOT/FAA/CT-94-36)

TABLE 6.
EVADING FLIGHT SIMULATOR CPA DATA
4.2.2 Independent Variables.
The effects of blunder angle (10, 20, or 30 degrees), runway
spacing (5280 ft or 7600 ft), and blundering aircraft response
status (on or off) on the average CPA were examined.
As expected, 30 degree blunders resulted in controllers
maintaining less aircraft separation than 10 or 20 degree
blunders. Secondly, blunders that did not respond resulted in
controllers maintaining less aircraft separation. Finally,
blunders initiated between the runways spaced 5280 ft apart (17R
and 17L) resulted in less separation.
As expected, the CPA data confirmed that 30 degree, no-response
blunders were a worst-case situation. Therefore, the aircraft
separation data from 30 degree, no response blunders into flight
simulators were examined in greater detail. The distribution of
CPA's for these blunders is presented in figure 5.
Thirty degree, no-response blunders into flight simulators
produced conflicts with CPA's that ranged from 280 ft to 10,357
ft. The mean separation for these blunders was 3388.9 ft (s.d. =
1490.5 ft).
4.2.3 CPA Lower Distribution Analysis.
Analyses were conducted on the lower tail of the distribution
resulting from 30 degree, no-response blunders into flight
simulators. There were 13 conflicts in which the CPA came within
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