BOMBARDIER Primus 2000XP Pilot Training Manual page 21

P I L O T T R A I N I N G G U I D E
CONE OF CONFUSION
OSS
As VOR moves from ARMED to ACTIVE, the VOR will flash for approximately 5
seconds, when active.
For Training Purposes Only
Sept 04
AUTOMATIC FLIGHT CONTROL SYSTEM
OSS 1 OSS 2
OSS - is used to detect erratic radio signals
encountered in the area above VOR transmitter.
OSS1 monitors beam deviation and will occur when:
• OSS has occurred.
• A calculated period of time has elapsed since last
TO/FROM transition.
• The period of time elapsed is calculated using true
airspeed and altitude.
• The higher the altitude, the longer it takes to get
through cone of confusion.
• The higher the airspeed, the faster the airplane will
be through the cone.
• VOR track has occurred, 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:
• OSS1 has occurred, plus 3 seconds.
• Beam deviation is less than 1 dot.
• Beam rate is less than 25 feet/sec.
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