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If DME is available, the cone of confusion entry boundary is estimated based on distance to transmitter and altitude or VOR TO/FROM transition. When over the VOR station, VOR will follow a course change of up to 120°. The cone of confusion exit boundary is based on altitude, airspeed and time. If DME information is not available, the cone of confusion boundaries are determined by level of beam noise or VOR TO/FROM transition. When in VOR over station, the flight director roll commands are limited to ± 24° and roll rate commands are 7°/sec. The over station sensor (OSS) monitors entry into zone of confusion and removes radio deviation from the roll command. OSS . is used to detect erratic radio signals encountered in the area aboveCONE OF CONFUSION VOR transmitter. OSS1 monitors beam deviation and will occur when: OSS has occured.
The period of time elapsed is calculated using true speed and altitude.
The higher the altitude, the longer it takes to get through cone of diffusion.
The higher the airspeed, the faster the airplane will be through the cone.
VOR track has occured, plus 3 seconds of elapsed time.
Distance to station is less than 1/4 of the altitude and DME present, or lateral deviation is greater than 1 dot and rate of deviation is greater than 25 feet/sec and DME is not present. OSS2 . ensures beam deviation is useable and will occur when:
Beam rate is less than 25 feet/sec.
Active. “VOR”will flash for approximately 5 seconds, when active. AUTOMATIC FLIGHT CONTROL SYSTEM
VOR MODE INTERCEPT
SELECTED HEADING CHANGE VOR MODE TRACK
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