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OSS 1
OSS
OSS 2
OSS
OSS1
OSS2
- is used to detect erratic radio signals
encountered in the area above VOR transmitter.
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.
- 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.
GX_02_017
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-20 For Training Purposes Only
Sept 04
LIM VOR AP1 ALT
SPD VOR VNAV
0.856M
VOR1
CRS
090
HDG
030
SRP
VOR 1
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
30.0NM
LIM HDG AP1 ALT
SPD VOR VNAV
0.856M
VOR1
CRS
090
HDG
030
SRP
VOR 1
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
30.0NM
LIM VOR AP1 ALT
SPD VOR VNAV
0.856M
VOR1
CRS
090
HDG
030
SRP
VOR 1
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
21.1NM
VOR MODE CAPTURE
VOR MODE INTERCEPT
SELECTED
COURSE
SELECTED
HEADING
Typical Capture Point
2 Dots
090°
030°
SELECTED RADIAL (270°)
SELECTED
COURSE
SELECTED
VOR STATION
090°
VOR MODE TRACK
SELECTED
COURSE
SELECTED
HEADING
SELECTED
VOR STATION
Second
Heading
Initial Change
Heading
Change
090°
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 center of the radial.
GX_02_018
For Training Purposes Only
Sept 04
2-21
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
Localizer (LOC) Mode
Localizer mode provides for automatic intercept, capture and tracking of the front
course localizer beam, to line up on the centerline of the runway in use.
Localizer capture and tracking commands are based on the distance-to-transmitter.
The FMS will output distance to tuned navaid or distance to destination, based on the
following conditions:
• If the FMS is used to autotune the LOC, the FMS will output the distance to the
tuned LOC transmitter
• If the FMS is tuned manually by LOC-ident on the CDU, the FMS will output the
distance to the tuned LOC transmitter, regardless of approach or flightplan
• If the LOC frequency is manually tuned with a LOC-frequency on the CDU, or if
tuned on the RMU, and the FMS will output distance to destination selected in the
flight plan
• If the LOC frequency is manually tuned with a LOC-frequency on the CDU, or if
tuned on the RMU, and the FMS does not have a destination selected, no distance
information will be output by the FMS. In this case, the AFCS will use estimated
distance
The AFCS priority for determining distance to LOC transmitter is:
• Distance-to-station (DME) information, if the DME is valid and co-located with
the localizer transmitter
• If DME information is not available, or not co-located, the distance to localizer is
based on radio altitude, true airspeed, glideslope deviation and an assumed flight
path angle of 3°
• If, in addition to invalid DME, the radio altitude is invalid, the AFCS will use FMS
distance information
• If the FMS is also unavailable, then AFCS will use a default value of 10 nm
If a destination other than the one designated in the FMS flight plan is used and the
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AUTOMATIC FLIGHT CONTROL SYSTEM(8)
