119 

Federal Aviation Administration, DOT 

Pt. 60, App. A 

modules are executed sequentially in the 
host computer. The flight controls input can 
occur at any time in the iteration, but these 
data will not be processed before the start of 
the new iteration. For example, a flight sim-
ulator running at 60 Hz may have a dif-
ference of as much as 16.67 msec between test 
results. This does not mean that the test has 
failed. Instead, the difference is attributed to 
variations in input processing. In some con-
ditions, the host simulator and the visual 

system do not run at the same iteration rate, 
so the output of the host computer to the 
visual system will not always be syn-
chronized. 

m. The transport delay test should account 

for both daylight and night modes of oper-
ation of the visual system. In both cases, the 
tolerances prescribed in Table A1A must be 
met and the motion response should occur 
before the end of the first video scan con-
taining new information. 

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