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is not available, the estimate is updated based on true airspeed and course error.
Capture and tracking will occur, provided that:
· The intersept angle is less than 60°. The optimum intercept angle should be less than 45°. If
greater than 45°, course cut limiting may occur to limit steering commands to 45° which
forces flight path to get to radial sooner to prevent overshooting beam center, and
· the bank angles required do not exceed the roll limits.
FD roll commands are limited to ± 24° when in VOR capture and roll rate commands are 5.5°/sec.
When VOR track is active, FD roll commands are ± 14° and roll rate commands 4°/sec.
If selected VOR is retuned
to another VOR frequency while in VOR capture, track or over station,
VOR mode cancels and rearms
automatically.
When the airplane is passing over the VOR transmitter (cone of confusion), VOR mode will fly
towards selected course reference (overstation
passage). If selected course is unchanged prior to
entry into cone of confusion, previously computed wind correction is applied and VOR mode will
not command a turn towards selected course pointer. Changes of course pointer setting when
overstation
will cause a change in course hold reference.
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 above
VOR transmitter.
OSS1 monitors beam deviation and will occur when:
OSS has occured.
A calculated period of time has elapsed since last TO/FROM transition.
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:
OSS1 has occured, plus 3 seconds.
Beam deviation is less than 1 dot.
Beam rate is less than 25 feet/sec.
OSS
OSS 1 OSS 2
CONE OF CONFUSION
GF0410_040
HDG
VOR Armed.
VOR
Active. “VOR” will flash for approximately 5 seconds, when active.
AUTOMATIC FLIGHT CONTROL SYSTEM
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
04−10−15
LATERAL NAVIGATION MODES (CONT'D)
Very High Frequency OmniDirectional
Range (VOR) Mode (Cont’d)
VOR MODE CAPTURE
SELECTED
COURSE
090°
SELECTED
VOR STATION
TYPICAL CAPTURE POINT
2 DOTS
VOR MODE INTERCEPT
HDG
030
AP1
20 20
HDG ALT
VOR
SELECTED
HEADING
030°
20 20
VOR AP1 ALT
VOR MODE TRACK
CRS
090
LOC1 30.0 NM
SRP
SELECTED RADIAL (270°)
VOR1
HDG
030
CRS
090
25.0 NM
SRP
VOR1
SELECTED
VOR STATION
SELECTED
COURSE
090°
HDG
030
CRS
090
21.0NM
SRP
VOR1
SELECTED
COURSE
090°
SELECTED
VOR STATION
INITIAL
HEADING
CHANGE
SELECTED
HEADING
030°
NOTE
During course cut limiting, typically the roll command will
make an initial heading change, level out and fly towards
the beam, then make a second heading change to line up
on the centre of the radial.
SECOND
HEADING
CHANGE
VOR AP1 ALT
3
N
6
33
E
W
24
21
s
15
30
12
N
6
33
E
W
24
21
s
15
30
12
3
N
6
33
E
W
24
21
s
15
30
12
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