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LOC-frequency is manually tuned with a LOC-frequency on the CDU, or tuned on the
RMU, and DME and RAD ALT are not available, the FMS will output erroneous
distance to destination data. To prevent potential problems in this circumstance, a limit
was placed on the value the AFCS will accept from the FMS for distance (30 nm).
Testing showed that when performing a close-in capture (7 - 10 nm) using the
maximum value for distance (30 nm), the LOC overshoots on initial capture were
within acceptable limits and were damped out within 2 oscillations.
FD roll commands are ± 30° when capturing localizer. During localizer track mode,
the roll commands are ± 24°. Roll rate commands are 7°/sec. during capture and 5.5°/
sec. during track modes. The optimum intercept angle is 45°. If intercept angle is
greater than 45°, course cut limiting may occur. As LOC moves from ARMED to
ACTIVE, the LOC will flash for approximately 5 seconds, when active.
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-22 For Training Purposes Only
Sept 04
LIM LOC AP1 ALT
SPD VOR VNAV
0.856M
LOC1
CRS
090
HDG
040
SRP
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
7.0NM
LIM HDG AP1 ALT
SPD LOC VNAV
0.856M
LOC1
CRS
090
HDG
040
SRP
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
10.0NM
LIM LOC AP1 VS
SPD VOR VNAV
0.856M
LOC1
CRS
090
HDG
040
SRP
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
5.0NM
LOCALIZER MODE INTERCEPT
LOCALIZER MODE CAPTURE
INBOUND
COURSE
LOCALIZER
TX
SELECTED
HEADING
Typical Capture Point
Between 1 and 2 Dot
RUNWAY
RUNWAY
090°
040°
INBOUND
COURSE
LOCALIZER
TX
090°
LOCALIZER MODE TRACK
MDA
OUTER
MARKER
MIDDLE
MARKER
RUNWAY
LOCALIZER
TX
GX_02_019
For Training Purposes Only
Sept 04
2-23
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
Back Course (BC) Mode
Back course mode provides for automatic intercept, capture, and tracking of the back
course localizer signal.
BC mode is identical to LOC mode except that the transmitter is located 2000 feet in
front of the touch-down point. The course arrow must be set to the front course runway
heading. The FGC will invert the course and radio deviation signals to provide correct
back course steering commands.
As BC moves from ARMED to ACTIVE, the BC will flash for approximately 5
seconds, when active.
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-24 For Training Purposes Only
Sept 04
LIM BC AP1 ALT
SPD VOR VNAV
0.856M
LOC1
CRS
090
HDG
330
ATT2
ADC1
20 10 10
10
20 20
20
30
30
N
33
30
W
24
21
S
15
12
E
6
3
10
LIM HDG AP1 ALT
SPD BC VNAV
0.856M
LOC1
CRS
090
HDG
330
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
GX_02_020
BACK COURSE MODE CAPTURE BACK COURSE MODE TRACK
BACK COURSE MODE INTERCEPT
RUNWAY
INBOUND
COURSE
LOCALIZER
TX
330°
Typical
Capture Point
090°
LIM BC AP1 ALT
SPD VOR VNAV
0.856M
LOC1
CRS
090
HDG
330
ATT2
ADC1
20 20
10 10
10 10
20 20
N
33
30
W
24
21
S
15
12
E
6
3
For Training Purposes Only
Sept 04
2-25
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
FMS Lateral Navigation (LNAV) Mode
The FMS lateral steering command is a roll command which aligns the airplane with
the flight plan in the FMS. The FGC limits the FMS roll commands to 30° and roll rate
to 5.5°/sec.
As LNAV moves from ARMED to ACTIVE, the LNAV will flash for approximately 5
　
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