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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.
The FD will transition automatically from FMS navigation to an approach or back course mode, via
the approach preview mode. The selected NAV source must be FMS and NAV radio must be
tuned to a localizer frequency, to select an approach preview.
The previewed approach is armed by pushing APR or BC switch on guidance panel and the
NAV radio must be tuned to a localizer frequency. When LOC
LNAV AP1 FLC
LOC or BC captures, it
replaces LNAV.
LOC AP1 FLC
If the active vertical mode was not VNAV prior to capture, the vertical mode remains unchanged. If
the active vertical mode was VNAV prior to capture LOC
LNAV AP1 VPTH
, then ALT mode will replace
the vertical mode.
LOC AP1 ALT
If armed approach mode was APR (ILS), then GS is armed with LOC capture GS
LOC AP1 FLC
and
GS will capture when GS criteria is met.
LOC AP1 GS
HDG
LNAV Armed.
LNAV
Active. “LNAV” will flash for approximately 5 seconds, when active.
AUTOMATIC FLIGHT CONTROL SYSTEM
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
04−10−19
LATERAL NAVIGATION MODES (CONT'D)
FMS Lateral Navigation (LNAV) Mode (Cont’d)
PREVIEWED APPROACH
HDG
330
DTK
360
LOC1 23.4 NM
SRP
FMS1
Preview
Navigation
Source
Preview
Course
Pointer
LNAV capture will occur when the airplane
is within 2.5 miles of the desired track and
moving away from it.
LNAV capture will occur when the airplane is at
a calculated point, as a function of track error and
ground speed, if the airplane is flying towards the
desired track.
DESIRED TRACK
DESIRED TRACK
N
6
33
W
24
21
15
30
12
3
S
E
GF0410_057
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
04−10−20
LATERAL NAVIGATION MODES (CONT'D)
Back Course (BC) Mode
Back course mode provides for automatic intercept, capture and tracking of the back course
localizer signal.
When BC is armed, BC HDG is automatically active
HDG AP1 ALT
BC .
BC mode is identical to LOC mode except that the transmitter is located 2000 feet in front of the
touchdown
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.
HDG
BC Armed.
BC
Active. “BC” will flash for approximately 5 seconds, when active.
AUTOMATIC FLIGHT CONTROL SYSTEM
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
04−10−21
LATERAL NAVIGATION MODES (CONT'D)
Back Course (BC) Mode (Cont’d)
HDG
330
090°
INBOUND
COURSE
LOCALIZER
TX
TYPICAL
CAPTURE
POINT
BACK COURSE MODE INTERCEPT
HDG
330
RUNWAY
330°
BC AP1 ALT
HDG
330
CRS
090
CRS
090
CRS
090
BACK COURSE MODE CAPTURE BACK COURSE MODE TRACK
N
6
33
E
W
24
21
s
15
30
12
3
N
6
33
E
W
24
21
s
15
30
12
3
N
6
33
E
W
24
21
s
15
30
12
3
GF0410_062
AP1
20 20
HDG ALT
BC
20 20
AP1
20 20
BC ALT
20 20
10
20 20
10
10 10
20 20
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
04−10−22
MODES OF OPERATION: (VERTICAL)
The following are vertical modes of operation:
Pitch Hold (PIT)
PIT mode is automatically selected when no other vertical mode is active and the autopilot is
engaged and if ROL mode is active and no vertical mode is active. If the pitch angle is greater
than 20°, pitch hold mode will reduce the airplane pitch angle to ± 20°. PIT reference is modifiable
(within pitch limits), via pilot inputs to the pitch thumbwheel,
or by TCS. There is no speed
protection in PITCH mode.
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